BEGIN:VCALENDAR VERSION:2.0 PRODID:-//The International Max Planck Research School (IMPRS) of Astronomy and Astrophysics//NONSGML Events//EN CALSCALE:GREGORIAN X-WR-CALNAME:The International Max Planck Research School (IMPRS) of Astronomy and Astrophysics - Events X-ORIGINAL-URL:https://blog.mpifr-bonn.mpg.de/imprs/events/event/ X-WR-CALDESC:The International Max Planck Research School (IMPRS) of Astronomy and Astrophysics - Events BEGIN:VEVENT UID:20180412T0726Z-1523517982.6898-EO-12755-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20180409T095950Z LAST-MODIFIED:20180716T091840Z DTSTART;TZID=Europe/Berlin:20180716T130000 DTEND;TZID=Europe/Berlin:20180716T140000 SUMMARY: MS: Arshia Maria Jacob DESCRIPTION: Speaker: Arshia Maria Jacob Title : CH as a tracer for molecul ar hydrogen: forming synergies between its FIR and radio fingerprints Abstr act: The existence of “CO-dark” molecular hydrogen has motivated the search for alternative chemical tracers for H2 in diffuse clouds. A search that r esulted in the use and establishment of interstellar hydrides such as HF\, […] X-ALT-DESC;FMTTYPE=text/html:

Speaker: Arshia Maria Jacob

Title : CH as a tracer for molecular hydrogen: forming synergies between its FIR an d radio fingerprints

Abstract:
The existence of "CO-dark" molecu lar hydrogen has motivated the search
for alternative chemical tracers for H2 in diffuse clouds. A search that
resulted in the use and estab lishment of interstellar hydrides such as
HF\, CH and OH as tracers fo r the same. CH stands out from its hydride
counterparts for a number o f reasons and the aim of this work is to
reveal its power as a suitabl e tracer by studying transitions of CH at
different wavelengths. Howev er\, the plot thickens as the interpretation
of the ground state radio lines of CH display characteristics of a weak
maser due to anomalous excitation.

In this talk I would like to discuss the synergies formed between the
FIR and radio spectra of CH towards W49N and W51 and the various methods
employed in deriving parameters like column density an d the physical and
excitation conditions that prevail in the surroundi ng medium.

CATEGORIES:MondaySeminar ORGANIZER;CN="pott":MAILTO:pott@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/arshia-mari a-jacob/ END:VEVENT BEGIN:VEVENT UID:20180412T0726Z-1523517982.6942-EO-12756-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20180409T100044Z LAST-MODIFIED:20180628T104637Z DTSTART;TZID=Europe/Berlin:20180723T130000 DTEND;TZID=Europe/Berlin:20180723T140000 SUMMARY: MS: X-ALT-DESC;FMTTYPE=text/html: CATEGORIES:MondaySeminar ORGANIZER;CN="pott":MAILTO:pott@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/christoph-h eiter/ END:VEVENT BEGIN:VEVENT UID:20180412T0726Z-1523517982.6986-EO-12757-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20180409T100131Z LAST-MODIFIED:20180628T110926Z DTSTART;TZID=Europe/Berlin:20180730T130000 DTEND;TZID=Europe/Berlin:20180730T140000 SUMMARY: MS: Sac Medina & Christopher Heiter X-ALT-DESC;FMTTYPE=text/html: CATEGORIES:MondaySeminar ORGANIZER;CN="pott":MAILTO:pott@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/sac-medina/ END:VEVENT BEGIN:VEVENT UID:20180412T0726Z-1523517982.703-EO-12758-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20180409T100218Z LAST-MODIFIED:20180423T082054Z DTSTART;TZID=Europe/Berlin:20180806T130000 DTEND;TZID=Europe/Berlin:20180806T140000 SUMMARY: MS: No Seminar due to vacation X-ALT-DESC;FMTTYPE=text/html: CATEGORIES:MondaySeminar ORGANIZER;CN="pott":MAILTO:pott@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/monthly-dis cussion/ END:VEVENT BEGIN:VEVENT UID:20180412T0726Z-1523517982.7073-EO-12760-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20180409T100311Z LAST-MODIFIED:20180423T082239Z DTSTART;TZID=Europe/Berlin:20180813T130000 DTEND;TZID=Europe/Berlin:20180813T140000 SUMMARY: MS: No Seminar due to vacation X-ALT-DESC;FMTTYPE=text/html: CATEGORIES:MondaySeminar ORGANIZER;CN="pott":MAILTO:pott@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/laure-bousc asse/ END:VEVENT BEGIN:VEVENT UID:20180412T0726Z-1523517982.7117-EO-12761-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20180409T100401Z LAST-MODIFIED:20180423T082317Z DTSTART;TZID=Europe/Berlin:20180820T130000 DTEND;TZID=Europe/Berlin:20180820T140000 SUMMARY: MS: No Seminar due to Vacation X-ALT-DESC;FMTTYPE=text/html: CATEGORIES:MondaySeminar ORGANIZER;CN="pott":MAILTO:pott@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/abel-schoot emeijer/ END:VEVENT BEGIN:VEVENT UID:20180618T2220Z-1529360416.3142-EO-12932-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20180618T062905Z LAST-MODIFIED:20180827T091444Z DTSTART;TZID=Europe/Berlin:20180827T130000 DTEND;TZID=Europe/Berlin:20180827T140000 SUMMARY: Monday Seminar Richa Sharma & Jae-Young Kim DESCRIPTION: 1st: Speaker: Richa Sharma Title: Investigating quasi-periodic oscillations in microquasar LS I +61°303 Abstract: LS I +61°303 is a micro quasar with a radio outburst every ∼27 days. Previous studies of the system have revealed short-term radio variability superimposed on the large radio outburst along with hints of X-ray variability. We investigated these vari ability in LS I […] X-ALT-DESC;FMTTYPE=text/html:

1st:
Speaker: Richa Sharma

Titl e: Investigating quasi-periodic oscillations in microquasar LS I +61°303

Abstract:
LS I +61°303 is a microquasar with a radio outburst ever y ∼27 days. Previous studies of the system have revealed short-term radio v ariability superimposed on the large radio outburst along with hints of X-r ay variability. We investigated these variability in LS I +61°303 at both r adio and X-ray wavelengths\, in order to understand the accretion-ejection coupling in microquasars. In this talk\, I will first present my results of detection of quasi-periodic oscillations (QPOs) of hour time-scales in the X-ray and radio emission of LS I +61°303. Furthermore\, I will also presen t my ongoing work on investigating QPOs in simultaneous radio and X-ray dat a of LS I +61°303 to understand the physical processes behind the occurrenc e of QPOs.

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2 nd:
Speaker: Jae-Young Kim

Title: High Spatial Resolution Millim eter VLBI Study of the Nearby Radio Galaxy M87

Abstract:
Messier 87 (M87) is one of the nearest radio galaxies with a prominent jet
ex tending from sub-pc to kpc scales. Because of its proximity and the largemass of its central black hole (BH)\, it is one of the best radio sourc es for
the study of jet formation. We study the physical conditions ne ar the jet base
at projected separations from the BH of ∼7–100 Schwarz schild radii (Rs).
Global mm-VLBI Array (GMVA) observations at 86 GHz (λ = 3.5 mm) provide an
angular resolution of ∼50 μarcsec\, which corr esponds to a spatial resolution
of only 7 Rs and reach the small spati al scale. We use five GMVA data sets of
M87 obtained from 2004 to 2015 and present new high angular resolution VLBI
maps at 86GHz. In partic ular\, we focus on the analysis of the brightness
temperature\, the je t ridge lines\, and the ratio of jet to counter-jet. The
imaging revea ls a parabolically expanding limb-brightened jet which emanates
from a resolved VLBI core of ∼(8–13)Rs in size. The observed brightness
temp erature of the core at any epoch is ∼(1–3)×1010 K\, which
is below the equipartition brightness temperature and suggests magnetic energy
dom inance at the jet base. We estimate the diameter of the jet at its base to< br />be ∼5Rs assuming a self-similar jet structure. This suggests that the sheath
of the jet may be anchored in the very inner portion of the acc retion disk.
The image stacking reveals faint emission at the center o f the edge-brightened
jet on sub-pc scales. I will discuss its physica l implication within the
context of the spine-sheath structure of the jet. If time allows\, I will also
present results from recent polarime tric GMVA observations of another nearby
but more peculiar radio galax y 3C 84 (NGC 1275).

ORGANIZER;CN="pott":MAILTO:pott@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/monday-semi nar/ END:VEVENT BEGIN:VEVENT UID:20180412T0726Z-1523517982.7161-EO-12762-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20180409T100453Z LAST-MODIFIED:20180412T095400Z DTSTART;TZID=Europe/Berlin:20180903T130000 DTEND;TZID=Europe/Berlin:20180903T140000 SUMMARY: MS: Monthly Discussion X-ALT-DESC;FMTTYPE=text/html: CATEGORIES:MondaySeminar ORGANIZER;CN="pott":MAILTO:pott@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/monthly-dis cussion-2/ END:VEVENT BEGIN:VEVENT UID:20180412T0726Z-1523517982.7206-EO-12763-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20180409T100546Z LAST-MODIFIED:20180910T093727Z DTSTART;TZID=Europe/Berlin:20180910T130000 DTEND;TZID=Europe/Berlin:20180910T140000 SUMMARY: MS: Laura Vega Garcia & Roberto Angioni DESCRIPTION: Speaker: Laura Vega Garcia Title: Space VLBI studies of intern al structure and physical processes in extragalactic relativistic jets Abst ract: 0836+710 is a high redshift quasar that was observed with extremely h igh resolution with space VLBI using RadioAstron at 1.6~GHz\, and 22~GHz be tween October 2013 and January 2014. A spectral analysis\, together with a kinematic analysis using […] X-ALT-DESC;FMTTYPE=text/html:

Speaker: Laura Vega Garcia

Title: Sp ace VLBI studies of internal structure and physical processes in extragalac tic relativistic jets

Abstract:
0836+710 is a high redshift quas ar that was observed with extremely high resolution with space VLBI using R adioAstron at 1.6~GHz\, and 22~GHz between October 2013 and January 2014. A spectral analysis\, together with a kinematic analysis using the 43 GHz Bo ston University Blazar program data\, reveals the presence of a recollimati on shock in the jet\, at a distance of 0.15 mas from the jet origin. We obs erved that moving components interacting with this recollimation shock migh t be causing the gamma ray flares observed in the source. We use the core s hift analysis and synchrotron spectrum fitting to estimate the magnetic fie ld strength in the jet core\, with both methods providing a consistent esti mate of B_core ~ 0.03 G at 5 GHz. We use the spectral index images to estim ate a value of the magnetic power of the jet at distances of 400 pc from th e central engine.

We also use the 1.6 GHz data (ground and space VLBI ) to determine the ridgeline of the jet and use it for investigating the de velopment of Kelvin-Helmholtz instability in the flow. We identify several distinct modes of the instability and determine their wavelengths and growt h lengths. This study allows us to derive relevant physical parameters such as the jet classical Mach number and density ratio of the jet with respect to the ambient medium. At last\, the space VLBI image of 0836+710 at 22 GH z reveals a rich\, asymmetric jet structure\, which we interpret as resulti ng either from the differential Doppler boosting in a mildly rotating jet\, or from a helical magnetic field.

---------------------------------- ----------------

2nd:
Speaker: Roberto Angioni

Title: Gamm a-ray emission in radio galaxies under the VLBI scope

Abstract:
We report on the first systematic VLBI and gamma-ray monitoring study of a representative sample of radio galaxies with strong compact radio emission\ , with the aim of exploring the intrinsic relationship between high-energy emission and pc-scale jet properties in active galactic nuclei (AGN). While a number of studies have firmly established a close relationship between t he gamma-ray and radio properties of AGN in general\, the samples considere d are dominated by blazars\, i.e. AGN featuring well-aligned\, Doppler-boos ting-dominated jets. This poses a challenge in disentangling the orientatio n-dependent effects from the intrinsic emission produced in AGN jets. Radio galaxies\, on the other hand\, have misaligned jets whose emission is much less affected by Doppler boosting. We find that the high-energy emission i n the compact jets of radio galaxies is not strongly driven by orientation- dependent Doppler boosting effects\, much unlike the situation in their bla zar counterparts. However\, a significant correlation between gamma-ray flu x and radio flux still holds\, suggesting a direct physical link between th e intrinsic emission properties of AGN jets in the two wavebands. We base o ur study on the decade(s)-long VLBI monitoring provided by the TANAMI and M OJAVE programs\, in combination with gamma-ray data from Fermi-LAT\, and al so report on the interplay between pc-scale jet kinematics and gamma-ray em ission in key individual sources.

CATEGORIES:MondaySeminar ORGANIZER;CN="pott":MAILTO:pott@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/laura-vega- garcia-roberto-angioni/ END:VEVENT BEGIN:VEVENT UID:20180412T0726Z-1523517982.7252-EO-12764-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20180409T100642Z LAST-MODIFIED:20180917T091414Z DTSTART;TZID=Europe/Berlin:20180917T130000 DTEND;TZID=Europe/Berlin:20180917T140000 SUMMARY: MS: Eric F. Jimenez and Anne Baczko DESCRIPTION: Speaker: Eric Faustino Jimenez-Andrade Title: Hot vs cold mode of star formation: New insights from radio continuum emission of galaxies over 0.35 X-ALT-DESC;FMTTYPE=text/html:

Speaker: Eric Faustino Jimenez-Andrade

Title: Hot vs cold mode of star formation: New insights from radio conti nuum emission of galaxies over 0.35 CATEGORIES:MondaySeminar ORGANIZER;CN="pott":MAILTO:pott@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/eric-fausti no/ END:VEVENT BEGIN:VEVENT UID:20180412T0726Z-1523517982.7297-EO-12765-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20180409T100731Z LAST-MODIFIED:20180924T100433Z DTSTART;TZID=Europe/Berlin:20180924T130000 DTEND;TZID=Europe/Berlin:20180924T140000 SUMMARY: Abel Schootemeijer DESCRIPTION: Speaker: Abel Schootemeijer Title: Mixing processes in massive stars in the Small Magellanic Cloud Abstract: The evolution of massive sta rs\, which are the progenitors of exciting phenomena such as (superluminous ) supernovae and gravitational waves\, critically depends on the efficiency of a number of internal mixing processes. Although some of these mixing pr ocesses are well-known and also […] X-ALT-DESC;FMTTYPE=text/html:

Speaker: Abel Schootemeijer

Title: M ixing processes in massive stars in the Small Magellanic Cloud

Abstra ct:
The evolution of massive stars\, which are the progenitors of exci ting phenomena such as (superluminous) supernovae and gravitational waves\, critically depends on the efficiency of a number of internal mixing proces ses. Although some of these mixing processes are well-known and also observ ed on Earth (e.g.\, convection and semiconvection)\, it is not understood h ow efficient convective overshooting and semiconvection operate in massive stars. We attempt to put constrains on these internal mixing processes by s tudying massive stars in the Small Magellanic Cloud.

CATEGORIES:MondaySeminar ORGANIZER;CN="pott":MAILTO:pott@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/hans-nguyen / END:VEVENT BEGIN:VEVENT UID:20180412T0726Z-1523517982.7341-EO-12766-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20180409T100826Z LAST-MODIFIED:20180910T112534Z DTSTART;TZID=Europe/Berlin:20181001T130000 DTEND;TZID=Europe/Berlin:20181001T140000 SUMMARY: MS: Monthly Discussion X-ALT-DESC;FMTTYPE=text/html: CATEGORIES:MondaySeminar ORGANIZER;CN="pott":MAILTO:pott@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/monthly-dis cussion-3/ END:VEVENT BEGIN:VEVENT UID:20181004T0924Z-1538645079.8405-EO-13024-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20181002T135406Z LAST-MODIFIED:20181002T135735Z DTSTART;TZID=Europe/Berlin:20181005T130000 DTEND;TZID=Europe/Berlin:20181005T170000 SUMMARY: Applying for postdoctoral positions and fellowships DESCRIPTION: 13:00 - 13:05 Introduction 13:05 - 13:50 Eduardo Ros "The raid for a postdoc" 13:50 - 14:35 Viola Tegethoff "Publicly funded fellowships" 14:35 - 14:50 Coffee Break 14:50 - 15:35 Laura Spitler "Applying for postd oc positions - Lessons learned" 15:35 - 16:20 Ann Mao "Writing a successful application and mastering the interviews" 16:20 - end Additional […] X-ALT-DESC;FMTTYPE=text/html: 
13:00 - 13:05 Introduction13:05 - 13:50 
 Eduardo Ros "The raid for a postdoc"13:50 - 14:35 Viola Tegethoff "Publicly
  funded fellowships"14:35 - 14:50 Coffee Break14:50 - 15:35 Laura Spitler "
 Applying for postdoc positions - Lessons learned"15:35 - 16:20 Ann Mao "Wri
 ting a successful application and mastering the interviews"16:20 - end Addi
 tional Q&A and Hands-on session
LOCATION:MPIfR\, Room 0.02 GEO:50.730090;7.069570 ORGANIZER;CN="rmauersberger":MAILTO:rmauersberger@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/playing-for -postdoctoral-positions-and-fellowships/ END:VEVENT BEGIN:VEVENT UID:20180412T0726Z-1523517982.7383-EO-12768-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20180409T100919Z LAST-MODIFIED:20181008T104242Z DTSTART;TZID=Europe/Berlin:20181008T130000 DTEND;TZID=Europe/Berlin:20181008T140000 SUMMARY: MS: Laila Linke DESCRIPTION: Speaker: Laila Linke Title: Studying the Galaxy-Galaxy-Matter Distribution in the Universe Abstract: Understanding the interplay between dark and baryonic matter is one of the most crucial issues of cosmology and extragalactic astronomy. For this goal\, we measure the correlation betwee n the number density of galaxy pairs and their surrounding dark matter in c ombined data from the […] X-ALT-DESC;FMTTYPE=text/html:

Speaker: Laila Linke

Title: Studying the Galaxy-Galaxy-Matter Distribution in the Universe

Abstract:
Understanding the interplay between dark and baryonic matter is one of the most crucial issues of cosmology and extragalactic astronomy. For this goa l\, we measure the correlation between the number density of galaxy pairs a nd their surrounding dark matter in combined data from the Kilo-Degree Surv ey (KiDS) and the Galaxy And Mass Assembly Survey (GAMA) with Galaxy-Galaxy -Galaxy-Lensing (G3-Lensing). Improved measurements and theoretical modelli ng of the G3-Lensing Signal will lead to a better discrimination between mo dels of galaxy formation and evolution.

CATEGORIES:MondaySeminar ORGANIZER;CN="pott":MAILTO:pott@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/tilemachos- athanasiadis/ END:VEVENT BEGIN:VEVENT UID:20180911T1304Z-1536671089.3906-EO-13005-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20180911T065135Z LAST-MODIFIED:20181015T093245Z DTSTART;TZID=Europe/Berlin:20181015T130000 DTEND;TZID=Europe/Berlin:20181015T140000 SUMMARY: MS Hannah Zohren DESCRIPTION: Speaker: Hannah Zohren Title: Galaxy Clusters – Optical Confir mation and Weak Lensing Mass Constraints Abstract: Samples of galaxy cluste rs provide a versatile basis for studies of the cosmological parameters tha t govern the Universe. They are assembled based on observable properties of the clusters. Detections based on the Sunyaev Zel’dovich (SZ) effect build the basis for surveys […] X-ALT-DESC;FMTTYPE=text/html:

Speaker: Hannah Zohren

Title: Galaxy Clusters - Optical Confirmation and Weak Lensing Mass Constraints

Ab stract:
Samples of galaxy clusters provide a versatile basis for studi es of the cosmological parameters that govern the Universe. They are assemb led based on observable properties of the clusters. Detections based on the Sunyaev Zel'dovich (SZ) effect build the basis for surveys like the Planck SZ survey (PSZ2) and the 2500 deg^2 South Pole Telescope (SPT) SZ Survey. They provide samples of galaxy clusters with a well-characterised selection function.
In my talk I will present our past on future work on two in dependent cluster samples. On the one hand\, I will show our follow-up anal ysis of optical observations obtained for 32 Planck cluster candidates usin g the ACAM instrument at the 4.2m William Herschel Telescope. On the other hand\, I will briefly outline our strategy to obtain HST based weak lensing mass estimates for the 9 high redshift clusters (z>1.2) with the highest S Z-significance in the 2500 deg^2 SPT-SZ Survey.

CATEGORIES:IMPRS,MondaySeminar ORGANIZER;CN="pott":MAILTO:pott@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/ms/ END:VEVENT BEGIN:VEVENT UID:20180911T1304Z-1536671089.4199-EO-13006-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20180911T065218Z LAST-MODIFIED:20180911T065225Z DTSTART;TZID=Europe/Berlin:20181022T130000 DTEND;TZID=Europe/Berlin:20181022T140000 SUMMARY: MS X-ALT-DESC;FMTTYPE=text/html: CATEGORIES:IMPRS,MondaySeminar ORGANIZER;CN="pott":MAILTO:pott@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/ms-2/ END:VEVENT BEGIN:VEVENT UID:20180412T0726Z-1523517982.7426-EO-12769-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20180409T101005Z LAST-MODIFIED:20181105T100714Z DTSTART;TZID=Europe/Berlin:20181029T130000 DTEND;TZID=Europe/Berlin:20181029T140000 SUMMARY: MS: Laure Bouscasse DESCRIPTION: Speaker: Laure Bouscasse Title: Chemical differentiation in hi gh-mass protostellar objects Abstract: The physical conditions in massive d ense cores (MDCs) leading to high-mass star formation are poorly constraine d. From the 870 mm ATLASGAL survey of the inner Galaxy\, in the frame of th e SPARKS project (Survey for high-mass Protostars with ALMA Revealed up to Kpc Scales\, PI: […] X-ALT-DESC;FMTTYPE=text/html:

Speaker: Laure Bouscasse

Title: Chem ical differentiation in high-mass protostellar objects

Abstract:
The physical conditions in massive dense cores (MDCs) leading to high-mass star formation are poorly constrained. From the 870 mm ATLASGAL survey of the inner Galaxy\, in the frame of the SPARKS project (Survey for high-mass Protostars with ALMA Revealed up to Kpc Scales\, PI: Csengeri)\, we perfor med an ALMA follow-up on the most massive mid-infrared quiet clumps within 5 kpc. In addition to the 8 GHz instantaneous bandwidth in Band 7\, we obta ined a complete spectral survey covering the 2mm\, 1mm and 0.8mm atmospheri c windows with the APEX telescope towards a handful of sources. We determin e the chemical composition of the protostellar envelopes\, and aim to pin d own where different molecules are located within the envelope with a partic ular focus on the distribution and diversity of complex organic molecules.< /p> CATEGORIES:MondaySeminar ORGANIZER;CN="pott":MAILTO:pott@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/m-tiwari/ END:VEVENT BEGIN:VEVENT UID:20180412T0726Z-1523517982.7473-EO-12771-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20180409T101101Z LAST-MODIFIED:20181106T080214Z DTSTART;TZID=Europe/Berlin:20181105T130000 DTEND;TZID=Europe/Berlin:20181105T140000 SUMMARY: MS: Monthly Discussion & Christoph Schürmann DESCRIPTION: Speaker: Christoph Schürmann Title: Binary Population Synthesi s with ComBinE   no abstract X-ALT-DESC;FMTTYPE=text/html:

Speaker: Christoph Schürmann

Title: Binary Population Synthesis with ComBinE

 

no abstract

CATEGORIES:MondaySeminar ORGANIZER;CN="pott":MAILTO:pott@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/monthly-dis cussion-4/ END:VEVENT BEGIN:VEVENT UID:20180412T0726Z-1523517982.7516-EO-12773-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20180409T101149Z LAST-MODIFIED:20181112T102917Z DTSTART;TZID=Europe/Berlin:20181112T130000 DTEND;TZID=Europe/Berlin:20181112T140000 SUMMARY: MS:Tilemachos Athanasiadis & Kevin Harrington DESCRIPTION: Speaker: Tilemachos Athanasiadis Title: A targeted survey for pulsars orbiting high proper motion GAIA white dwarfs Abstract: The GAIA sa tellite is a revolutionary astrometric mission that monitors the positions of 1.5 billion sources in the Milky Way. Among these stars are hundreds of white dwarfs with likely pulsar companions\, that can now be singled-out ba sed on […] X-ALT-DESC;FMTTYPE=text/html:

Speaker: Tilemachos Athanasiadis

Tit le: A targeted survey for pulsars orbiting high proper motion GAIA white dw arfs

Abstract:
The GAIA satellite is a revolutionary astrometric mission that monitors the positions of 1.5 billion sources in the Milky Wa y. Among these stars are hundreds of white dwarfs with likely pulsar compan ions\, that can now be singled-out based on their kinematic properties (e.g . high velocities and/or high galactic latitudes). We are currently perform ing a survey (using the Effelsberg and Arecibo radio telescopes) to search more than 100 of the most promising GAIA low-mass white dwarfs for millisec ond pulsar companions. All of our candidates are nearby (<1.5kpc) and their distances are well known. Because of the information provided by GAIA\, an y pulsar discovered by this survey will yield a precise neutron star mass m easurement through combined spectroscopic and timing observations\, thereby contributing significantly to our understanding of the equation-of-state a nd pulsar formation.--------------------------------------------------2nd:S peaker: Kevin HarringtonTitle: The Molecular ISM and global properties of S trongly Lensed Star-forming galaxies at z ~1-3Abstract:In this talk I will cover the extensive (>500h single dish telescope time: GBT/LMT/APEX/30m) le gacy CO survey in a sample of 25 strongly lensed galaxies at high redshift. These systems provide an efficient means to study gas rich\, star-forming galaxies at the peak of the co-moving SFR density in the cosmic history. I will discuss the Large Velocity Gradient methods involved in modeling the r adiative transfer for the observed\, spatially averaged CO and dust SEDs. T hese ultimately place tight constraints on the global physical gas properti es in the low-mass/higher-excitation molecular component\, and the high-mas s/low-excitation gas component. I will conclude with ongoing work in conjun ction with this systematic CO SLED modeling campaign and future avenues of follow-up.

CATEGORIES:MondaySeminar ORGANIZER;CN="pott":MAILTO:pott@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/kevin-harri ngton/ END:VEVENT BEGIN:VEVENT UID:20181116T1405Z-1542377129.2489-EO-13125-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20181116T111140Z LAST-MODIFIED:20181116T111337Z DTSTART;TZID=Europe/Berlin:20181123T130000 DTEND;TZID=Europe/Berlin:20181123T133000 SUMMARY: PhD Defense: Carlos Duran DESCRIPTION: Terahertz Airborne Astronomy using a Four Detector High Resolu tion Spectrometer: 4GREAT After the Herschel Space Telescope ceased operati ons in 2013\, the astronomical community has been lacking access to those p arts of the terahertz spectrum that are not visible from ground-based obser vatories. The atmosphere blocks most of the radiation at those frequency ba nds\, even at high geographical […] X-ALT-DESC;FMTTYPE=text/html:

Terahertz Airborne Astronomy using a Four Detector High Resolution Spectrometer: 4GREAT

After the Herschel Spac e Telescope ceased operations in 2013\, the astronomical community has been lacking access to those parts of the terahertz spectrum that are not visib le from ground-based observatories. The atmosphere blocks most of the radia tion at those frequency bands\, even at high geographical altitude faciliti es like the Atacama desert (> 5000 m altitude)\, where APEX and ALMA operat e. 4GREAT\, an extension of the German Receiver at Terahertz frequencies (G REAT) operated aboard the Stratospheric Observatory for Infrared Astronomy (SOFIA)\, has been developed in response to those needs. This works describ es its design\, test\, commissioning and scientific capabilities. 4GREAT is a heterodyne receiver that comprises four different detector bands and the ir associated subsystems\, which can be simultaneously operated fully indep endently in one system. All four detector beams are co-aligned on the sky. The four frequency bands of 4GREAT cover 492-627\, 893-1073\, 1239-1515 and 2495-2690 GHz respectively. Various astrophysically important spectral lin es are observable in each band\, and in some cases different transitions of the same species\, for example CO\, lie in two or more bands of 4GREAT. Th e very important ground state transitions of various molecules can be obser ved\, including NH3 \, H218O\, CH\, OH\, OH+ \, NH\, NH2\, and the deuterat ed isotopologues HDO\, and OD\, as well as fine structure lines from neutra l atomic carbon\, [CI]\, and ionized nitrogen\, [NII]. The expanded capabil ities of GREAT with 4GREAT are now being used for a variety of spectroscopi c studies. Its potential has been demonstrated by an absorption study of tw o ground state transitions or the methylidyne radical (CH) in diffuse molec ular gas. As CH traces the unobservable molecular hydrogen\, such observati ons are of fundamental importance for diffuse cloud astrochemistry. [Refere es: Prof. Dr. Karl M. Menten\, Prof. Dr. Frank Bertoldi\, Prof. Dr. Ian Bro ck\, Prof. Dr. Hubert Schorle]

CATEGORIES:Thesis Defense LOCATION:MPIfR\, Room 0.02 GEO:50.730090;7.069570 ORGANIZER;CN="rmauersberger":MAILTO:rmauersberger@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/phd-defense -carlos-duran-terahertz-airborne-astronomy-using-a-four-detector-high-resol ution-spectrometer-4great/ END:VEVENT BEGIN:VEVENT UID:20180412T0726Z-1523517982.7558-EO-12774-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20180409T101245Z LAST-MODIFIED:20181203T105651Z DTSTART;TZID=Europe/Berlin:20181203T130000 DTEND;TZID=Europe/Berlin:20181203T140000 SUMMARY: MS: Sandra Unruh & Monthly Discussion DESCRIPTION: Speaker: Sandra Unruh Title: Shear-ratio tests and magnificati on bias (in weak gravitational lensing) Abstract: Using the same lens galax ies\, the ratios of tangential shears for different source galaxy redshifts is equal to the ratios of their corresponding angular-diameter distances. This is the so-called shear-ratio test (SRT) and it is valid when effects i nduced by the intervening […] X-ALT-DESC;FMTTYPE=text/html:

Speaker: Sandra Unruh

Title: Shear-r atio tests and magnification bias
(in weak gravitational lensing)

< p>Abstract:
Using the same lens galaxies\, the ratios of tangential sh ears for different source galaxy redshifts is equal to the ratios of their corresponding angular-diameter distances. This is the so-called shear-ratio test (SRT) and it is valid when effects induced by the intervening large-s cale structure (LSS) can be neglected. The dominant LSS effect is magnifica tion bias which\, on the one hand\, induces an additional shear\, and on th e other hand\, causes a magnification of the lens population. Our objective is to quantify the magnification bias for the SRT and show an easy-to-appl y mitigation strategy that does not rely on additional observations. We use ray-tracing data through the Millennium simulation to measure the influenc e of magnification on the SRT and test our mitigation strategy. Using the S RT as a null-test we find deviations from zero up to 10% for a flux-limited sample of lens galaxies\, which is a strong function of lens redshift and the lens-source line-of-sight separation. Using our mitigation strategy we can improve the null-test by a factor of ∼ 100.

CATEGORIES:MondaySeminar ORGANIZER;CN="pott":MAILTO:pott@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/sandra-unru h-monthly-discussion/ END:VEVENT BEGIN:VEVENT UID:20181115T0935Z-1542274515.2921-EO-13084-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20181112T082332Z LAST-MODIFIED:20181112T082332Z DTSTART;TZID=Europe/Berlin:20181217T130000 DTEND;TZID=Europe/Berlin:20181217T140000 SUMMARY: MS X-ALT-DESC;FMTTYPE=text/html: CATEGORIES:MondaySeminar ORGANIZER;CN="pott":MAILTO:pott@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/ms-4/ END:VEVENT BEGIN:VEVENT UID:20181214T1201Z-1544788893.0098-EO-13136-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20181214T112939Z LAST-MODIFIED:20181214T112939Z DTSTART;TZID=Europe/Berlin:20181218T110000 DTEND;TZID=Europe/Berlin:20181218T120000 SUMMARY: PhD Defense: Carsten König DESCRIPTION: Deep\, Large Scale Surveys of Star Forming Regions throughout the Milky Way   Star formation and the processes involved are not only impo rtant to the Milky Way as an astronomical object\, but are also crucial to understand our own origin. For instance\, only lower-mass stars like our ow n Sun have supposedly a long enough lifetime to […] X-ALT-DESC;FMTTYPE=text/html:

Deep\, Large Scale Su rveys of Star Forming Regions throughout the Milky Way

 

Star formation and the processes involved are not only important to the Milky Wa y as an astronomical object\, but are also crucial to understand our own or igin. For instance\, only lower-mass stars like our own Sun have supposedly a long enough lifetime to allow for the development of life\, whereas high -mass stars are the major source of the heavy elements like iron\, that are needed to form life as we know it. Therefore\, understanding the influence of the Galactic environment on low- to high-mass star formation is crucial to understand our own place in the Galaxy. In this work we have investigat ed star formation throughout the Milky Way - from the inner parts to the fa r outer Galaxy\, ranging from a small\, well selected sub-sample up to a co mplete sample of massive star-forming regions. We used several different du st-continuum surveys (ATLASGAL\, Hi-GAL\, MSX and WISE) to obtain photometr ic data\, and consecutively model the spectral energy distributions of the dense molecular clumps in which stars and star clusters form. From these we derive the physical properties such as dust temperatures\, integrated flux es and H2 column densities. We derive distances from line-of-sight velociti es obtained from CO observations for the majority of the sources\, allowing us to calculate clump masses and bolometric luminosities and analyze the p roperties of the sources in the context of their large scale Galactic envir onment.

CATEGORIES:Thesis Defense LOCATION:MPIfR\, Room 0.02 GEO:50.730090;7.069570 ORGANIZER;CN="rmauersberger":MAILTO:rmauersberger@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/phd-defense -carsten-konig/ END:VEVENT BEGIN:VEVENT UID:20181214T1201Z-1544788893.0251-EO-13135-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20181214T112644Z LAST-MODIFIED:20181214T113207Z DTSTART;TZID=Europe/Berlin:20181219T130000 DTEND;TZID=Europe/Berlin:20181219T133000 SUMMARY: PhD Defense: Eleni Graikou DESCRIPTION: High precision pulsar timing Pulsars are rapidly rotating\, hi ghly magnetised neutron stars\, remnants of a supernova explosion. The majo rity of the science that we can do with pulsars comes from a technique that is called pulsar timing. Millisecond pulsars\, which are pulsars with spin periods of only few milliseconds\, are ideal objects to apply timing since […] X-ALT-DESC;FMTTYPE=text/html: 
High precision pulsar timingPulsars are 
 rapidly rotating\, highly magnetised neutron stars\, remnants of a supernov
 a explosion. The majority of the science that we can do with pulsars comes 
 from a technique that is called pulsar timing. Millisecond pulsars\, which 
 are pulsars with spin periods of only few milliseconds\, are ideal objects 
 to apply timing since their rotational stability on long timescales approac
 hes that of atomic clocks. Probably one of the most interesting application
  of pulsar timing is the detection of gravitational waves (GWs) in the nano
 Hz regime with pulsar timing arrays (PTAs). The main source of red noise in
  pulsars that potentially blocks the detection of GWs with PTAs is chromati
 c variations produced by perturbations in the interstellar medium. In the f
 irst part of the talk I will focus on the usage of the Effelsberg and MeerK
 AT high-frequency receivers on measuring these dispersion measure variation
 s and increasing the sensitivity to GWs. Even though GWs have been directly
  detected with LIGO\, the first observational evidence of their existence c
 ame from the study of the first binary neutron star system ever discovered\
 , PSR B1913+16. In the second part of this talk\, I will present the effect
  of the relativistic geodetic precession on the total intensity profile and
  polarisation properties on this pulsar. As well as our study about the sha
 pe of the emission beam. Finally\, I will show the timing analysis of a pul
 sar-white dwarf system\, PSR J1933-6211 and present its evolution.
CATEGORIES:Thesis Defense LOCATION:MPIfR\, Room 0.02 GEO:50.730090;7.069570 ORGANIZER;CN="rmauersberger":MAILTO:rmauersberger@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/phd-defense -eleni-graikou/ END:VEVENT BEGIN:VEVENT UID:20181115T0935Z-1542274515.3042-EO-13085-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20181112T083949Z LAST-MODIFIED:20181112T083949Z DTSTART;TZID=Europe/Berlin:20190114T130000 DTEND;TZID=Europe/Berlin:20190114T140000 SUMMARY: MS X-ALT-DESC;FMTTYPE=text/html: CATEGORIES:MondaySeminar ORGANIZER;CN="pott":MAILTO:pott@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/ms-5/ END:VEVENT BEGIN:VEVENT UID:20181223T0344Z-1545536687.8414-EO-13143-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20181220T150511Z LAST-MODIFIED:20190107T123033Z DTSTART;TZID=Europe/Berlin:20190115T110000 DTEND;TZID=Europe/Berlin:20190115T120000 EXDATE;TZID=Europe/Berlin:20190108T110000 RDATE;TZID=Europe/Berlin:20190116T110000,20190117T110000,20190122T110000,20190123T110000,20190124T110000,20190129T110000,20190130T110000,20190131T110000,20190205T110000,20190206T110000,20190207T110000,20190212T110000,20190213T110000,20190214T110000,20190116T110000,20190117T110000,20190122T110000,20190123T110000,20190124T110000,20190131T110000,20190130T110000,20190129T110000,20190205T110000,20190206T110000,20190207T110000,20190212T110000,20190213T110000,20190214T110000 SUMMARY: Tools of Astronomy: Problems and solutions DESCRIPTION: Based of Tom Wilson’s book “Tools of Radio Astronomy: Problems and solutions”\, the author will illustrate radio astronomical methods and concepts by showing the audience how to solve typical radio astronomical p roblems and thus extract the information you need from your observations. T he book will be made electronically available to IMPRS researchers. Further information and registration: https://events.mpifr-bonn.mpg.de/indico/even t/106/ X-ALT-DESC;FMTTYPE=text/html:

Based of Tom Wilson's book "Tools of Radio Astronomy: Problems and solutions"\, the author will illustrate radio astr onomical methods and concepts by showing the audience how to solve typical radio astronomical problems and thus extract the information you need from your observations. The book will be made electronically available to IMPRS researchers.

Further information and registration: https://events.mpi fr-bonn.mpg.de/indico/event/106/

CATEGORIES:Blackboard LOCATION:MPIfR\, room 0.01 GEO:50.730090;7.069570 ORGANIZER;CN="rmauersberger":MAILTO:rmauersberger@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/tools-of-as tronomy-problems-and-solutions/ END:VEVENT BEGIN:VEVENT UID:20190121T1437Z-1548081423.2916-EO-13157-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20190121T105139Z LAST-MODIFIED:20191216T115423Z DTSTART;TZID=Europe/Berlin:20190123T163000 DTEND;TZID=Europe/Berlin:20190123T170000 RRULE:FREQ=WEEKLY;INTERVAL=1;BYDAY=WE;UNTIL=20200122T153000Z EXDATE;TZID=Europe/Berlin:20190227T163000,20190306T163000,20190313T163000,20190320T163000,20190410T163000,20190417T163000,20190515T163000,20191225T163000,20200101T163000 SUMMARY: Guided Meditation Sessions: Kevin Harrington in 0.02 DESCRIPTION: I would like to invite you all to please consider carving out 20-30 minutes of your time by attending the meditation sessions held on Wed nesdays at 16:30. Anyone is welcome–staff\, postdocs\, PhD + Masters studen ts–while no experience is necessary. I copy below the outline I had sent a while back\, followed by the schedule for the […] X-ALT-DESC;FMTTYPE=text/html:

I would like to invite you all to please c onsider carving out 20-30 minutes of your time by attending the meditation sessions held on Wednesdays at 16:30. Anyone is welcome--staff\, postdocs\, PhD + Masters students--while no experience is necessary.

I copy bel ow the outline I had sent a while back\, followed by the schedule for the n ext couple of months. I will occasionally send a reminder email!

*NOT E* If you are keen on going\, but this time does not work\, please let me k now an alternative time for me to consider!!! (:

Please save the sche dule below for future reference
-

----Outline----

This is aimed at being a vital resource for those who would like to take a break fo r 10\, 20\, or 30 mins. I have guided meditations for students/faculty/etc at UMass Amherst for 5 years\, having established the non-denominational me ditation group that still functions today on campus. It is my hope that tho se of you here in Bonn may find your own version of meditation to be a life tool to hold onto\, which can especially be used in the course of a work d ay.
-20-30 min meditation
(some guiding by myself\, but with lots of time for silent contemplation--slightly different meditation topics/the mes will be introduced each week)

-2-3 minutes discussion (voluntary but highly encouraged!! (: )

^^You don't have to go every week\, but I'd be happy to see you all anytime!
If you have experience with medit ation and wouldn't mind sharing your experience with me personally\, that w ould be much appreciated.

CATEGORIES:Students' social activities ORGANIZER;CN="pott":MAILTO:pott@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/meditation- session-kevin-harrington/ END:VEVENT BEGIN:VEVENT UID:20181115T0935Z-1542274515.3368-EO-13088-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20181112T084144Z LAST-MODIFIED:20190205T105018Z DTSTART;TZID=Europe/Berlin:20190204T130000 DTEND;TZID=Europe/Berlin:20190204T140000 SUMMARY: MS Parichay Mazumdar DESCRIPTION: Title: LASMA (13CO\, J= 3-2) Survey of the Milky Way Abstract: Surveys of the Milky Way are fundamental tools to obtain reliable constrai nts for the gas distribution for the models that aim to simulate our Galaxy ’s spiral arms and bar potentials. While continuum surveys (e.g.- GLIMPSE\, Hi-GAL\, ATLASGAL\, MIPSGAL) trace the dense ISM and recent star […] X-ALT-DESC;FMTTYPE=text/html:

Title: LASMA (13CO\, J= 3-2) Survey of the Milky Way

Abstract:
Surveys of the Milky Way are fundamental to ols to obtain reliable constraints for the gas distribution for the models that aim to simulate our Galaxy's spiral arms and bar potentials. While con tinuum surveys (e.g.- GLIMPSE\, Hi-GAL\, ATLASGAL\, MIPSGAL) trace the dens e ISM and recent star forming activity going on in the Milky Way\; spectros copic follow-ups (e.g. GRS\, HOPS\, CHIMPS\, COHRS\, SEDIGISM) reveal the k inematics (radial velocities and kinematic distances) of the molecular clou ds and clumps detected in the continuum surveys. They also constraint their dynamical state in addition to gas excitation\, chemical abundances and tu rbulence. With advancements in technology we are able to observe the Galaxy with much higher angular resolution than the past revealing cloud sub-stru ctures as well as providing us with a more detailed view on the large-scale structure of the molecular gas. In this talk I will present the on-going L ASMA survey of the inner Milky Way in 12/13CO (J=3-2) performed with the At acama Pathfinder EXperiment (APEX) telescope in Chile and the early science from the data collected so far.

CATEGORIES:MondaySeminar ORGANIZER;CN="pott":MAILTO:pott@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/ms-8/ END:VEVENT BEGIN:VEVENT UID:20181115T0935Z-1542274515.3438-EO-13089-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20181112T084229Z LAST-MODIFIED:20190211T104141Z DTSTART;TZID=Europe/Berlin:20190211T130000 DTEND;TZID=Europe/Berlin:20190211T140000 SUMMARY: MS Christos Karoumpis DESCRIPTION: Title: Prospects for Intensity Mapping the [CII] Fine Structur e Line during the Epoch of Reionization Abstract: The ionic [CII] fine stru cture line at 158 μm is one of the brightest lines in the spectrum of star- forming galaxies. It is an excellent target for unresolved spectral line in tensity mapping (LIM) observations at redshifts 5 to 8\, providing […] X-ALT-DESC;FMTTYPE=text/html:

Title: Prospects for Intensity Mapping the [CII] Fine Structure Line during the Epoch of Reionization

Abstract:
The ionic [CII] fine structure line at 158 μm is one of the brightest lines in the spectrum of star-forming galaxies. It is an excellent target for unresolved spectral line intensity mapping (LIM) observations at redshi fts 5 to 8\, providing an integral\, unbiased tomographic view of the star formation activity and source distribution throughout the epoch of reioniza tion. At these redshifts and due to its brightness the [CII] line can be ob served through the mm atmospheric window using grounded-based single dished telescopes with large field-of-view and low resolution spectrometers. At p resent\, despite being in the reach of current technology\, such an experim ent does not exist. CCAT-prime\, a high altitude (5600m) 6-meters diameter telescope\, equipped with state-of-the-art (sub)mm spectrometers with large field of view\, will be the ideal instrument to map the [CII] intensity di stribution coming from the epoch of reionization. To test the feasibility a nd help optimizing the survey strategy of CCAT-prime\, mock [CII] intensity maps are needed. In the literature\, numerous of them are available\, thou gh providing [CII] power spectrum predictions inconsistent by up to an orde r of magnitude. Such discrepancies challenge the design of CCAT-prime surve ys but highlight also the need for robust observational constraints of the [CII] intensity distribution. The purpose of this project is to shed light on them by investigating the different choices that are made at every step of creating a [CII] mock intensity map.

CATEGORIES:MondaySeminar ORGANIZER;CN="pott":MAILTO:pott@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/ms-9/ END:VEVENT BEGIN:VEVENT UID:20181115T0935Z-1542274515.3546-EO-13090-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20181112T084311Z LAST-MODIFIED:20190128T121810Z DTSTART;TZID=Europe/Berlin:20190218T130000 DTEND;TZID=Europe/Berlin:20190218T140000 SUMMARY: MS: X-ALT-DESC;FMTTYPE=text/html: CATEGORIES:MondaySeminar ORGANIZER;CN="pott":MAILTO:pott@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/ms-10/ END:VEVENT BEGIN:VEVENT UID:20181115T0935Z-1542274515.3667-EO-13091-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20181112T084409Z LAST-MODIFIED:20181112T084409Z DTSTART;TZID=Europe/Berlin:20190225T130000 DTEND;TZID=Europe/Berlin:20190225T140000 SUMMARY: MS X-ALT-DESC;FMTTYPE=text/html: CATEGORIES:MondaySeminar ORGANIZER;CN="pott":MAILTO:pott@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/ms-11/ END:VEVENT BEGIN:VEVENT UID:20181115T0935Z-1542274515.3808-EO-13092-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20181112T084447Z LAST-MODIFIED:20190311T101958Z DTSTART;TZID=Europe/Berlin:20190311T130000 DTEND;TZID=Europe/Berlin:20190311T140000 SUMMARY: MS: David Aguilera Dena & Monthly Discussion DESCRIPTION: Speaker: David Aguilera Dena Title: Superluminous supernovae: A simple recipe to cook them with just a few ingredients! Abstract: Modelin g the evolution and mass loss history of rapidly rotating massive stars at low metallicity\, we found that chemically homogeneously evolving stars wit h enhanced rotational mixing could be suitable candidates for both SLSNe in the magnetar-driven scenario […] X-ALT-DESC;FMTTYPE=text/html:

Speaker: David Aguilera Dena

Title: Superluminous supernovae: A simple recipe to cook them with just a few ingr edients!

Abstract:
Modeling the evolution and mass loss history of rapidly rotating massive stars at low metallicity\, we found that chemic ally homogeneously evolving stars with enhanced rotational mixing could be suitable candidates for both SLSNe in the magnetar-driven scenario and for lGRBs in the collapsar scenario. They retain a high angular momentum in the ir cores\, enough to power these types of explosions\, and have masses\, ab undances and magnetic fields that could also be consistent with observation s of SLSNe and the hypernovae associated with lGRBs\; particularly reproduc ing the observed the lack of He in their envelopes. The outcome of core col lapse is determined by whether core collapse results in the formation of a fast spinning neutron star or a black hole. We analyze the evolution of the se progenitors\, as well as the parameter space where NS formation might fa vored over BH formation\, and properties of their cores and of their CSM at core collapse.

CATEGORIES:MondaySeminar ORGANIZER;CN="pott":MAILTO:pott@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/ms-12/ END:VEVENT BEGIN:VEVENT UID:20181115T0935Z-1542274515.3889-EO-13093-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20181112T084523Z LAST-MODIFIED:20190318T102908Z DTSTART;TZID=Europe/Berlin:20190318T130000 DTEND;TZID=Europe/Berlin:20190318T140000 SUMMARY: MS: Charitarth Vyas & Jan Luca van den Busch DESCRIPTION: 1st: Speaker: Charitarth Vyas (chair: David Aguilera Dena) Tit le: The study of the fuel for the Milky Way star formation Abstract: To for m stars for many Gyrs\, the Milky Way is considered to accrete pristine gas from the halo it resides in. This feeding ensures that the required mass a nd metallicity is replenished addressing the star […] X-ALT-DESC;FMTTYPE=text/html:

1st:
Speaker: Charitarth Vyas (chair: David Aguilera Dena)

Title: The study of the fuel for the Milky Way star formation

Abstract:
To form stars for many Gyrs\, the Milky Way is considered to accrete pristine gas from the halo it resides in. Thi s feeding ensures that the required mass and metallicity is replenished add ressing the star formation rate and the G-dwarf problem. Among many accreti on modes considered in the literature\, the Galactic fountain is the most f avorable.

In this talk\, I will present the study we have conducted t owards two prototypical\, high Galactic latitude translucent clouds\, Draco and Spider. Apparent from their radial velocities\, they are currently app roaching the Galactic disk and will probably provide the fuel for the futur e star formation. We use the two most important tracers of the interstellar medium - dust\, and gas to study their physical properties. Multiwavelengt h single dish and radio interferometric data allow us to probe sub-parsec s cales disclosing the compact cold gas clumps which are already forming mole cular hydrogen. We estimate their dust temperature\, v_lsr\, volume density \, linear size\, and other relevant physical parameters. I will also briefl y talk about the first results of the Pico-Veleta CO observations of these clouds that we've conducted with the IMPRS group.

------------------- -------------------------------

2nd:
Speaker: Jan Luca van den B usch (chair: Charitarth Vyas)

Title: Calibrating Redshifts Using Gala xy Cross-correlations

Abstract:
Current and future cosmological probes based on the large scale structure distribution are sensitive to bia ses in the redshift distributions of galaxies down to the percent level. Me eting such demands with secondary redshift estimates requires a precise cal ibration with reference samples.
One of the strategies deployed by the KiDS-VIKING cosmic shear survey is determining galaxy redshifts from the a ngular cross-correlation with spectroscopic data from 2dFLenS\, zCOSMOS\, D EEP2\, GAMA\, SDSS\, VVDS and WiggleZ. Using such a large reference sample and carefully correcting for galaxy biases and selection effects allows to obtain high precision redshift distributions.

CATEGORIES:MondaySeminar ORGANIZER;CN="pott":MAILTO:pott@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/ms-13/ END:VEVENT BEGIN:VEVENT UID:20181115T0935Z-1542274515.3999-EO-13094-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20181112T084557Z LAST-MODIFIED:20181112T084557Z DTSTART;TZID=Europe/Berlin:20190325T130000 DTEND;TZID=Europe/Berlin:20190325T140000 SUMMARY: MS X-ALT-DESC;FMTTYPE=text/html: CATEGORIES:MondaySeminar ORGANIZER;CN="pott":MAILTO:pott@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/ms-14/ END:VEVENT BEGIN:VEVENT UID:20181115T0935Z-1542274515.4114-EO-13095-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20181112T084632Z LAST-MODIFIED:20190401T091004Z DTSTART;TZID=Europe/Berlin:20190401T130000 DTEND;TZID=Europe/Berlin:20190401T140000 SUMMARY: MS Dongjin Kim & Monthly Discussion DESCRIPTION: Speaker: Dongjin Kim Title: mm-absorption in AGNs Abstract: VL BI absorption lines studies allow to spatially locate and image the absorbe r in front of a bright and compact AGN-core\, and by this test the Unified Scheme and hypothesis of a circum-nuclear torus. In particular\, absorption lines at mm wavelengths enables us to investigate matter which surrounds t he […] X-ALT-DESC;FMTTYPE=text/html:

Speaker: Dongjin Kim

Title: mm-absor ption in AGNs

Abstract:
VLBI absorption lines studies allow to s patially locate and image the absorber in front of a bright and compact AGN -core\, and by this test the Unified Scheme and hypothesis of a circum-nucl ear torus. In particular\, absorption lines at mm wavelengths enables us to investigate matter which surrounds the VLBI-core and inner jet on sub-pc s cales. For more detailed and statistical studies on molecular absorption sy stems\, we have conducted a new absorption line survey and sensitive VLBI o bservations in a well-selected sample of galaxies\, for which circum-nuclea r absorption is expected. This will help to clarify origins of the absorbin g matter around AGNs and reveal physical properties of the putative molecul ar tori.

CATEGORIES:MondaySeminar ORGANIZER;CN="pott":MAILTO:pott@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/ms-15/ END:VEVENT BEGIN:VEVENT UID:20181115T0935Z-1542274515.4216-EO-13096-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20181112T084718Z LAST-MODIFIED:20190408T085252Z DTSTART;TZID=Europe/Berlin:20190408T130000 DTEND;TZID=Europe/Berlin:20190408T140000 SUMMARY: MS Tasha Gautam DESCRIPTION: Speaker: Tasha Gautam (chair: Marilyn Cruces) Title: Search fo r pulsars in Globular Clusters Abstract: Globular clusters (GCs) are compac t\, nearly spherical group of hundreds of thousands of stars concentrated i n a region of about 20-100 parsecs with high stellar densities near the cor e. Such extreme stellar densities result in a high stellar interaction rate \, causing many […] X-ALT-DESC;FMTTYPE=text/html:

Speaker: Tasha Gautam (chair: Marilyn Cruc es)
Title: Search for pulsars in Globular Clusters

Abstract:
Globular clusters (GCs) are compact\, nearly spherical group of hundreds of thousands of stars concentrated in a region of about 20-100 parsecs with high stellar densities near the core. Such extreme stellar densities resul t in a high stellar interaction rate\, causing many two and three-body enco unters\, which can\, in turn\, lead to the production many X-ray binaries\, where neutron stars accrete matter from their new companions. This results in a very large number of millisecond pulsars per unit mass. In this study \, we use the Giant Metrewave Radio Telescope (GMRT) to search and characte rize pulsars in globular clusters\, NGC6440\, NGC6441\, NGC6544\, NGC1851\, NGC6539\, NGC6652\, M30 and Terzan 5. We were able to redetect 20 pulsars with high S/N and observe interstellar effects at low frequencies with GMRT . I will discuss about the detections and the search technique involved alo ng with some of the future projects that I will be part of.

CATEGORIES:MondaySeminar ORGANIZER;CN="pott":MAILTO:pott@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/ms-16/ END:VEVENT BEGIN:VEVENT UID:20190401T1024Z-1554114281.358-EO-13224-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20190401T081554Z LAST-MODIFIED:20190401T082404Z DTSTART;TZID=Europe/Berlin:20190412T140000 DTEND;TZID=Europe/Berlin:20190412T150000 SUMMARY: “Resilience – Learning from those who bounce back” X-ALT-DESC;FMTTYPE=text/html: CATEGORIES:IMPRS ORGANIZER;CN="pott":MAILTO:pott@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/resilience- learning-from-those-who-bounce-back/ END:VEVENT BEGIN:VEVENT UID:20181115T0935Z-1542274515.4361-EO-13097-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20181112T085045Z LAST-MODIFIED:20190415T085634Z DTSTART;TZID=Europe/Berlin:20190415T130000 DTEND;TZID=Europe/Berlin:20190415T140000 SUMMARY: MS Jompoj Wongphecauxson DESCRIPTION: Speaker: Jompoj Wongphecauxson (chair: Tasha Gautam) Title: Di scovery of a Galactic centre pulsar J1746-28 Abstract: Pulsars are the high ly magnetized rotating neutron stars\, the remnants of intermediate mass st ars (8-25 Solar mass)\, that emit electromagnetic radiation\, mostly detect ed at radio frequencies. The rotation periods of pulsars to date are rangin g from 1.3 milliseconds to 21.5 seconds. […] X-ALT-DESC;FMTTYPE=text/html:

Speaker: Jompoj Wongphecauxson (chair: Tas ha Gautam)
Title: Discovery of a Galactic centre pulsar J1746-28

Abstract:
Pulsars are the highly magnetized rotating neutron stars\, the remnants of intermediate mass stars (8-25 Solar mass)\, that emit elect romagnetic radiation\, mostly detected at radio frequencies. The rotation p eriods of pulsars to date are ranging from 1.3 milliseconds to 21.5 seconds . Pulsars areused as tools to study many physical phenomena\, for example m apping the distribution of interstellar medium in the Galaxy and testing th e General relativity theory. Typically the Fast Fourier Transform (FFT) is used to search for repeating signals. However\, the FFT has some limitation s on detecting long-period pulsars. The Fast Folding Algorithm (FFA)\, whic h is computationally more expensive than the FFT\, is used to overcome this limit and has been applied to the reprocessing of HTRU-S low lat survey. T his survey is one of the most sensitive blind pulsar surveys to date. This work has already led to the discovery of J1746-28.
A new pulsar J1746- 28\, located approximately 0.5 degrees from the Galactic centre\, was disco vered with a period of 1.89 seconds. J1746-28 has a similar distance ( appr oximated from the amount of a free electron distribution model) as other Ga lactic centre pulsars. By using this electron density model\, the separatio n of pulsar from the Galactic centre is just ~72 pc. J1746-28 processes the possibility to probe the ISM and the interstellar magnetic field around th e Galactic centre on a different scale than before.

CATEGORIES:MondaySeminar ORGANIZER;CN="pott":MAILTO:pott@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/ms-17/ END:VEVENT BEGIN:VEVENT UID:20181115T0935Z-1542274515.4575-EO-13098-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20181112T085141Z LAST-MODIFIED:20190429T093016Z DTSTART;TZID=Europe/Berlin:20190429T130000 DTEND;TZID=Europe/Berlin:20190429T140000 SUMMARY: MS Huanchen Hu & Davit Alkhanshvili DESCRIPTION: Speaker: Huanchen Hu (chair: Felix Pötzl) Title: Testing highe r order GR effects with the Double Pulsar Abstract: The Double Pulsar PSR J 0737-3039A/B has proven to be an excellent system for high precision tests of General Relativity. With currently the best timing measurement with Meer KAT\, the precision of these tests will increase and higher order general r elativity […] X-ALT-DESC;FMTTYPE=text/html:

Speaker: Huanchen Hu (chair: Felix Pötzl)< br />Title: Testing higher order GR effects with the Double Pulsar

Ab stract:
The Double Pulsar PSR J0737-3039A/B has proven to be an excell ent system for high precision tests of General Relativity. With currently t he best timing measurement with MeerKAT\, the precision of these tests will increase and higher order general relativity effects would become measurab le.
In this talk\, I will present the goal of this project and focus o n investigating the future prospects of measuring the Lense-Thirring effect with MeerKAT\, which would lead to the first measurement of the moment of inertia and hence constraining the equation of state of superdense matter. To do so\, I developed a simulation code to generate mock data for the Doub le Pulsar up to 2030\, and combine it with the current timing results (Kram er et al.\, in prep.). I will discuss some preliminary results and the futu re work.

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Spea ker: Davit Alkhanishvili (chair: Huanchen Hu)
Title: Computing the mat ter bispectrum using perturbation theory

Abstract:
Studying the large scale structure of the Universe is one of the main tools of cosmology . It has become widely accepted that gravitational instability plays a cent ral role in giving rise to the structures seen in galaxy surveys. Extractin g the wealth of information contained in galaxy clustering to learn about c osmology thus requires a quantitative understanding of the dynamics of grav itational instability. Higher-order statistics like three-point correlation function and its corresponding bispectrum will play a central role in this process once the forthcoming galaxy surveys will measure the bispectrum wi th sufficient accuracy for the first time.
In this talk I will present the agreement of cosmological matter bispectra to next to leading order in perturbation theory based on various theoretical models with a suite of nu merical simulations. Also I will outline some of the difficulties associate d with the accurate measurement of the theoretical bispectrum and what are the possible solutions for the future.

CATEGORIES:MondaySeminar ORGANIZER;CN="pott":MAILTO:pott@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/ms-18/ END:VEVENT BEGIN:VEVENT UID:20181115T0935Z-1542274515.4671-EO-13099-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20181112T085218Z LAST-MODIFIED:20190506T093702Z DTSTART;TZID=Europe/Berlin:20190506T130000 DTEND;TZID=Europe/Berlin:20190506T140000 SUMMARY: MS Laure Bouscasse DESCRIPTION: Speaker: Laure Bouscasse (chair: Davit Alkhanishvili) Title: C hemical differentiation in high-mass protostellar objects Abstract: The phy sical conditions in massive dense cores (MDCs) leading to high-mass star fo rmation are poorly constrained. Observations are lacking to confront theory . From the 870 micron ATLASGAL survey of the inner Galaxy\, in the frame of the SPARKS project (Survey for high-mass […] X-ALT-DESC;FMTTYPE=text/html:

Speaker: Laure Bouscasse (chair: Davit Alk hanishvili)
Title: Chemical differentiation in high-mass protostellar objects

Abstract:
The physical conditions in massive dense cores (MDCs) leading to high-mass star formation are poorly constrained. Observa tions are lacking to confront theory. From the 870 micron ATLASGAL survey o f the inner Galaxy\, in the frame of the SPARKS project (Survey for high-ma ss Protostars with ALMA Revealed up to Kpc Scales\, PI: Csengeri)\, we perf ormed an ALMA follow-up on the most massive mid-infrared quiet clumps withi n 5 kpc. We found 6 sources that stay single from 0.3 pc to 2000 au scales. This makes them relatively easy targets for single-dish observations to st udy the early warm-up phase chemistry leading to the appearance of classica l hot-cores. In addition to the 8 GHz instantaneous bandwidth at 345GHz obt ained with SPARKS\, we obtained a complete spectral survey covering the 2 m m\, 1 mm and 0.8 mm atmospheric window with the APEX telescope towards a ha ndful of sources. We will present here the chemical composition of the prot ostellar envelopes and pin down where different molecules are located withi n the envelope with a particular focus on the distribution and diversity of complex organic molecules.

CATEGORIES:MondaySeminar ORGANIZER;CN="pott":MAILTO:pott@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/ms-19/ END:VEVENT BEGIN:VEVENT UID:20181115T0935Z-1542274515.4784-EO-13100-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20181112T085306Z LAST-MODIFIED:20190513T093110Z DTSTART;TZID=Europe/Berlin:20190513T130000 DTEND;TZID=Europe/Berlin:20190513T140000 SUMMARY: MS: Konstantinos Migkas DESCRIPTION: Speaker: Konstantinos Migkas (chair: Laure Bouscasse) Title: I s the Universe isotropic? Using galaxy clusters to find out… Abstract: The Cosmological Principle is a fundamental pillar of the standard cosmological models. The way we understand the Universe is heavily based on the latter being isotropic. Surprisingly enough however\, this hypothesis still remain s ambiguous. In order to introduce […] X-ALT-DESC;FMTTYPE=text/html:

Speaker: Konstantinos Migkas (chair: Laure Bouscasse)
Title: Is the Universe isotropic? Using galaxy clusters to find out...

Abstract:
The Cosmological Principle is a fundament al pillar of the standard cosmological models. The way we understand the Un iverse is heavily based on the latter being isotropic. Surprisingly enough however\, this hypothesis still remains ambiguous. In order to introduce a new test for the isotropy of the Universe\, we use the eeHIFLUGCS galaxy cl uster sample to investigate the directional behavior of the X-ray luminosit y-temperature (L_X-T) relation of galaxy clusters. A tight correlation is k nown to exist between the two quantities of the X-ray-emitting intracluster medium of galaxy clusters\, and while the luminosity measurement depends o n the chosen cosmology through the luminosity distance\, the temperature\, flux and redshift determinations are cosmology-independent. Thus\, the isot ropy of the luminosity distance over the full extragalactic sky can be mirr ored in the behavior of the L_X-T scaling relation. The eeHIFLUGCS sample i s ideal for such a study due to its large number of clusters (contains the 400 brightest X-ray clusters in the sky)\, and the uniform full-sky coverag e it provides. Consistently with the results of our previous work\, the beh avior of the L_X-T relation of eeHIFLUGCS heavily depends on the direction of the sky. The presence of a dipole-like anisotropy is detected with a sim 3.5 sigma (99.95\\%) significance\, centered at the Galactic coordinates o f (l\,b)~(275 deg\, -15 deg)\, 66 deg away from the CMB dipole\, but roughl y consistent with the results of other cosmological probes. Several reasons that could potentially explain this were tested\, such as the existence of unknown hydrogen "dark" clouds\, the effect of bulk flows\, the bias intro duced by double clusters etc.\, but none was able to explain the obtained r esults in a satisfactory degree. Interestingly enough\, other cluster sampl es appear to have a similar behavior throughout the sky\, while being compl etely independent to each other and to eeHIFLUGCS. Combining all 3 samples\ , results to 844 different galaxy clusters with indepentent luminosity and temperature measurements. Performing a joint analysis\, the final anisotrop y of the obtained Hubble constant is further intensified (>6 sigma)\, with a dipole appearing towards (l\,b)~(258 deg\, -9 deg)\, separated by 56 deg from the CMB dipole. This result strongly demonstrates that X-ray studies t hat assume perfect isotropy in the properties of galaxy clusters\, can prod uce heavily biased results (e.g. X-ray mass determination of galaxy cluster s for cosmological studies). The identification of the factor that causes s uch behavior is of the utmost importance.

CATEGORIES:MondaySeminar ORGANIZER;CN="pott":MAILTO:pott@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/ms-20/ END:VEVENT BEGIN:VEVENT UID:20181115T0935Z-1542274515.4876-EO-13101-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20181112T085407Z LAST-MODIFIED:20190520T090709Z DTSTART;TZID=Europe/Berlin:20190520T130000 DTEND;TZID=Europe/Berlin:20190520T140000 SUMMARY: MS: Pedro Humire & Monthly Discussion DESCRIPTION: Speaker: Pedro Humire (chair: Konstantinos Migkas) Title: Unve iling the chemistry in NGC 253 through ALCHEMI data Abstract: The Sculptur Galaxy\, NGC 253\, is the nearest and brightest molecular emitter beyond th e local group\, a starburst galaxy perfectly accessible by ALMA and thus on e of the best laboratories to measure isotopologue ratios under extreme con ditions. Located at […] X-ALT-DESC;FMTTYPE=text/html:

Speaker: Pedro Humire (chair: Konstantinos Migkas)
Title: Unveiling the chemistry in NGC 253 through ALCHEMI dat a

Abstract:
The Sculptur Galaxy\, NGC 253\, is the nearest and b rightest molecular emitter beyond the local group\, a starburst galaxy perf ectly accessible by ALMA and thus one of the best laboratories to measure i sotopologue ratios under extreme conditions. Located at only 3.5 Mpc\, this object allows us to study its chemistry at an unprecedented resolution of a few pcs with the advantage of presenting conditions of intense star forma tion comparable to more distant galaxies.

In this talk\, I will prese nt the main science goals of the ALMA Comprehensive High-resolution Extraga lactic Molecular Inventory\, ALCHEMI\, in which I am involved\, together wi th some preliminary results related to isotopologue ratios and methanol mas ers observed at (sub)mm wavelengths.

CATEGORIES:MondaySeminar ORGANIZER;CN="pott":MAILTO:pott@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/ms-21/ END:VEVENT BEGIN:VEVENT UID:20181115T0935Z-1542274515.5018-EO-13102-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20181112T085454Z LAST-MODIFIED:20190527T085834Z DTSTART;TZID=Europe/Berlin:20190527T130000 DTEND;TZID=Europe/Berlin:20190527T140000 SUMMARY: MS Yuxin Lin DESCRIPTION: Speaker: Yuxin Lin (chair: Pedro Humire) Title: Internal struc ture of massive star-forming clumps Abstract: Massive clumps are precursors of OB clusters. Understanding the evolution of massive clump is crucial fo r establishing massive star formation scenario. Theoretical works have show n that clump density structures have decisive impact on fragmentation\, acc retion process and eventually on the star formation […] X-ALT-DESC;FMTTYPE=text/html:

Speaker: Yuxin Lin (chair: Pedro Humire)Title: Internal structure of massive star-forming clumps

Abstract :
Massive clumps are precursors of OB clusters. Understanding the evol ution of massive clump is crucial for establishing massive star formation s cenario. Theoretical works have shown that clump density structures have de cisive impact on fragmentation\, accretion process and eventually on the st ar formation rate. We aim to establish a systematic view of massive clump g as structure along evolutionary track. In our pilot SMA+APEX survey\, we us e transitions of multiple gas thermometers and densitometers to derive the spatially-resolved temperature and density profiles on 0.1 pc-1 pc scale to wards 6 massive clumps at different evolutionary stages. This is the missin g link between the possible global hierarchical collapse and the ongoing st ar-formation process in dense cores.

CATEGORIES:MondaySeminar ORGANIZER;CN="pott":MAILTO:pott@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/ms-22/ END:VEVENT BEGIN:VEVENT UID:20190531T0933Z-1559295186.127-EO-13266-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20190529T123739Z LAST-MODIFIED:20190529T123739Z DTSTART;TZID=Europe/Berlin:20190529T133000 DTEND;TZID=Europe/Berlin:20190529T150000 SUMMARY: How to apply for a Marie Curie Fellowship DESCRIPTION: Viola Tegethoff: How to apply for a Marie Curie Fellowship Rai ner Mauersberger: Selection criteria and how to address them X-ALT-DESC;FMTTYPE=text/html:

Viola Tegethoff: How to apply for a Marie Curie Fellowship

Rainer Mauersberger: Selection criteria and how to a ddress them

LOCATION:MPIfR\, Room 0.02 GEO:50.730090;7.069570 ORGANIZER;CN="rmauersberger":MAILTO:rmauersberger@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/how-to-appl y-for-a-marie-curie-fellowship/ END:VEVENT BEGIN:VEVENT UID:20190401T1024Z-1554114281.3868-EO-13226-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20190401T083232Z LAST-MODIFIED:20190603T090255Z DTSTART;TZID=Europe/Berlin:20190603T130000 DTEND;TZID=Europe/Berlin:20190603T140000 SUMMARY: MS Monthly Discussion & Prajwal Padmanabh DESCRIPTION: Speaker: Prajwal Padmanabh (chair: Yuxin Lin) Title: Long term profile stability of J1022+1001 Abstract: Understanding pulsar profile ins tability is key to placing accurate limits on the detectability of gravitat ional waves with pulsar timing arrays. The profile stability of PSR J1022+1 001 is investigated. Data from the Effelsberg Pulsar Observation System (EP OS) which operated in the 1990s and […] X-ALT-DESC;FMTTYPE=text/html:

Speaker: Prajwal Padmanabh (chair: Yuxin L in)
Title: Long term profile stability of J1022+1001

Abstract:Understanding pulsar profile instability is key to placing accurate lim its on the detectability of gravitational waves with pulsar timing arrays. The profile stability of PSR J1022+1001 is investigated. Data from the Effe lsberg Pulsar Observation System (EPOS) which operated in the 1990s and 200 0s is combined along with the new Asterix backend to achieve decades-long b aselines. PSR J1022+1001 is particularly interesting as separate analyses l ead to disagreements in literature over the timing precision achievable due to intrinsic profile variation (Kramer et al. 1998\, Hotan et al. 2004). I n an attempt to resolve this apparent contradiction\, Parkes data is includ ed and both analyses are reproduced.
In addition\, I will present an a daption of previous techniques to measure relative amplitude and position o f peaks in multi-component pulsars using a polynomial fit and compare this against previously published techniques. Polarisation is known to affect pu lse shape\, thus robust calibration is critical to high precision pulsar ti ming. Miscalibration has been cited as a potential source of discrepancy in previous analyses of J1022+1001 (Hotan et al. 2004). The results from the profile shape analysis are compared with the effects of polarisation miscal ibration.

CATEGORIES:IMPRS,MondaySeminar ORGANIZER;CN="pott":MAILTO:pott@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/ms-monthly- discussion/ END:VEVENT BEGIN:VEVENT UID:20181115T0935Z-1542274515.5136-EO-13103-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20181112T085553Z LAST-MODIFIED:20190617T080844Z DTSTART;TZID=Europe/Berlin:20190617T130000 DTEND;TZID=Europe/Berlin:20190617T140000 SUMMARY: MS: Felix Poetzl DESCRIPTION: Speaker: Felix Pötzl\, Chair: Jompoj W. Title: Magnetic fields in pc-scale AGN jets – the case of 3C 345 Abstract: Supermassive black hol es (SMBHs) in the centres of radio-loud active galactic nuclei (AGN) produc e collimated relativistic outflows\, called jets. They consist of a magneti zed plasma emitting synchrotron radiation. To date the exact mechanisms of jet launching […] X-ALT-DESC;FMTTYPE=text/html:

Speaker: Felix Pötzl\, Chair: Jompoj W.

Title: Magnetic fields in pc-scale AGN jets - the case of 3C 345

Abstract: Supermassive black holes (SMBHs) in the centres of radio-loud act ive galactic nuclei (AGN) produce collimated relativistic outflows\, called jets. They consist of a magnetized plasma emitting synchrotron radiation. To date the exact mechanisms of jet launching and collimation are still poo rly understood\, and very high resolution observations are needed to constr ain the theoretical models. The RadioAstron Key Science Project on AGN pola rization aims at using the full-polarization capabilities of the Spekt-R 10 -m space radio telescope\, together with an array of ground telescopes\, to observe a sample of AGN at the highest resolution\, down to microarcsecond s.
With these data it is possible to determine the magnetic fields str ength and morphology in the innermost regions of AGN. I present observation s of the strong blazar 3C 345\, which was observed in March 2016\, and some preliminary results.

CATEGORIES:MondaySeminar ORGANIZER;CN="pott":MAILTO:pott@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/ms-23/ END:VEVENT BEGIN:VEVENT UID:20181115T0935Z-1542274515.5246-EO-13104-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20181112T085741Z LAST-MODIFIED:20190701T091159Z DTSTART;TZID=Europe/Berlin:20190624T130000 DTEND;TZID=Europe/Berlin:20190624T140000 SUMMARY: MS: X-ALT-DESC;FMTTYPE=text/html: CATEGORIES:MondaySeminar ORGANIZER;CN="pott":MAILTO:pott@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/ms-24/ END:VEVENT BEGIN:VEVENT UID:20181115T0935Z-1542274515.5334-EO-13106-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20181112T090223Z LAST-MODIFIED:20190701T090528Z DTSTART;TZID=Europe/Berlin:20190701T130000 DTEND;TZID=Europe/Berlin:20190701T140000 SUMMARY: MS No seminar X-ALT-DESC;FMTTYPE=text/html: CATEGORIES:MondaySeminar ORGANIZER;CN="pott":MAILTO:pott@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/ms-25/ END:VEVENT BEGIN:VEVENT UID:20181115T0935Z-1542274515.5461-EO-13107-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20181112T090320Z LAST-MODIFIED:20190528T115612Z DTSTART;TZID=Europe/Berlin:20190708T130000 DTEND;TZID=Europe/Berlin:20190708T140000 SUMMARY: MS X-ALT-DESC;FMTTYPE=text/html: CATEGORIES:MondaySeminar ORGANIZER;CN="pott":MAILTO:pott@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/ms-26/ END:VEVENT BEGIN:VEVENT UID:20190513T1120Z-1557746414.9628-EO-13255-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20190513T074755Z LAST-MODIFIED:20190513T074755Z DTSTART;TZID=Europe/Berlin:20190711T090000 DTEND;TZID=Europe/Berlin:20190711T180000 SUMMARY: Institute Excursion to Effelsberg X-ALT-DESC;FMTTYPE=text/html: CATEGORIES:Excursion ORGANIZER;CN="pott":MAILTO:pott@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/institute-e xcursion-to-effelsberg/ END:VEVENT BEGIN:VEVENT UID:20181115T0935Z-1542274515.5587-EO-13108-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20181112T090402Z LAST-MODIFIED:20190701T090425Z DTSTART;TZID=Europe/Berlin:20190715T130000 DTEND;TZID=Europe/Berlin:20190715T140000 SUMMARY: MS X-ALT-DESC;FMTTYPE=text/html: CATEGORIES:MondaySeminar ORGANIZER;CN="pott":MAILTO:pott@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/ms-27/ END:VEVENT BEGIN:VEVENT UID:20181115T0935Z-1542274515.5697-EO-13109-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20181112T090458Z LAST-MODIFIED:20190805T105435Z DTSTART;TZID=Europe/Berlin:20190722T130000 DTEND;TZID=Europe/Berlin:20190722T140000 SUMMARY: MS Arshia Jacob & Chaoli Zhang DESCRIPTION: Speaker: Arshia Jacob\, Chair: Felix Pötzl Title: The search f or CH isotopes and understanding the elusive nature of CH2 Abstract: The hy dride story continues\, but this time in a search for the isotope of CH\, 1 3CH and understanding the origins of CH2 emission. In my talk today I will present the first detection of 13CH in […] X-ALT-DESC;FMTTYPE=text/html:

Speaker: Arshia Jacob\, Chair: Felix Pötzl

Title: The search for CH isotopes and understanding the elusive natu re of CH2

Abstract:
The hydride story continues\, but this time in a search for the
isotope of CH\, 13CH and understanding the origins of CH2 emission. In my talk
today I will present the first detection of 13CH in the interstellar medium
and discuss its importance in bench -marking the 12C/13C Galactic gradient.
Further I would also like to d iscuss our recent detections of CH2 towards star
forming regions with associated PDRs. As an early product of ion-molecule gas
phase chemist ry\, CH2 plays an important role in interstellar chemistry and was
fir st detected towards the Orion and W51 star-forming regions by Hollis et al.
1995. Given their high energies above the ground (215 K) they were th ought to
arise in dense\, hot regions near newly formed stars\, howeve r an origin in hot
photodissociation regions (PDRs) still remains a po ssibility. Combined with
carbon radio-recombination line (CRRL) data a t comparable angular resolution
we show that the elusive CH2 emission may indeed have origins in a hot\, dilute
medium.
--------------- -----------------------------------

Speaker: Chaoli Zhang\, Chair: Ar shia Jacob

Title: High Redshift Galaxy Groups As Seen by ATHENA

Abstract:
By 2031\, it is expected that our cosmological model\, whic h describes the evolution of the Universe\, will be tightly constrained fro m projects such as the eROSITA and Euclid satellite missions. However\, maj or astrophysical questions related to the formation and evolution of the la rgest collapsed structures\, namely galaxy groups and clusters\, will remai n open.

ATHENA will help to answer the questions of how and when the first galaxy groups in the Universe\, massive enough to bind more than 10^7 K gas\, formed. In this work\, we use a state-of-the-art SIXTE simulator t o investigate the ATHENA detection capabilities of the early galaxy groups (0.5 < z < 4) by using wavelet-based detection algorithm. The simulations t ake into account the main ATHENA instrumental features: background\, vignet ting and PSF degradation with off-axis angle. Since little is known about t he thermo-dynamical state of such groups\, different physically motivated m odels are simulated and tested. Our detailed simulations show such galaxy g roups can be detected with high probability as extended sources by ATHENA.< /p> CATEGORIES:MondaySeminar ORGANIZER;CN="pott":MAILTO:pott@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/ms-28/ END:VEVENT BEGIN:VEVENT UID:20190417T1254Z-1555505661.2435-EO-13243-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20190417T115008Z LAST-MODIFIED:20190805T105309Z DTSTART;TZID=Europe/Berlin:20190729T130000 DTEND;TZID=Europe/Berlin:20190729T140000 SUMMARY: MS Elaheh Hosseini & Madeleine Yttergren DESCRIPTION: Speaker: Elaheh Hosseini &\; \, Chair: Chaoli Zhang Title: Dusty sources in the vicinity of Sgr A* and constraining accretion flow de nsity profile near the Galactic Centre using S2 star Abstract: In the vicin ity of Sgr A* (SMBH) we observed several dusty infrared sources with NACO ( in K_s and L’ band) and SINFONI mounted at the […] X-ALT-DESC;FMTTYPE=text/html:

Speaker: Elaheh Hosseini & \, Chair: Chaol i Zhang

Title: Dusty sources in the vicinity of Sgr A* and constraini ng accretion flow
density profile near the Galactic Centre using S2 st ar

Abstract:
In the vicinity of Sgr A* (SMBH) we observed severa l dusty infrared sources
with NACO (in K_s and L' band) and SINFONI mo unted at the VLT/Chile. We are
able to identify D2\, D3\, D23\, D3.1 . These sources show near-infrared excess
and Doppler shifted line emis sion. We investigate these sources in order to
clarify their nature an d compare their relation to other observed NIR objects
close to Sgr A* . We need spatial and velocity information of these objects in
order t o determine their orbits. We determine Keplerian orbits and apply a
ph otometric analysis in H\, K_s\, L'- band. The spectrum of our investigated< br />objects show a Doppler-shifted Br gamma\, HeI and [FeIII] line emissio n. The
extracted near-infrared flux of our objects fit a SED model whi ch reveals our
sources are dust enshrouded stars. In addition in order to constrain the
density of the ambient medium of Sgr A*\, we study t he orbit of S2 star and we
succeeded to put an upper limit on the dens ity of this region.

------------------------------------------------- -----------------------------------

Speaker: Madeleine Yttergren \, C hair: Elaheh Hosseini

Title: Gas and stellar dynamics in Stephan's Qu intet

Abstract:
Compact galaxy groups are ideal laboratories for studying intense evolutionary activity. Stephan's Quintet\, a compact grou p cluster consisting of 5 galaxies\, is the home to extensive inter-galacti c star formation\, active nuclei\, previous interactions that can be traced via tidal tails as well as a current shock-inducing interaction. Through s tudying the gas and stellar dynamics of such a system we can shed light on galaxy evolution caused by extreme galaxy interactions\, and thereby take u s one step closer to understanding galaxy evolution over cosmic time.
In this talk I will discuss the importance of studying galaxy groups\, show the results of our optical spectroscopy observations and briefly discuss t he current stage of the analysis.

CATEGORIES:IMPRS,MondaySeminar ORGANIZER;CN="pott":MAILTO:pott@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/ms-elaheh-h osseini/ END:VEVENT BEGIN:VEVENT UID:20181115T0935Z-1542274515.5883-EO-13110-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20181112T090606Z LAST-MODIFIED:20190805T105138Z DTSTART;TZID=Europe/Berlin:20190805T130000 DTEND;TZID=Europe/Berlin:20190805T140000 SUMMARY: MS Thanh Dat Hoang & Monthly Discussion DESCRIPTION: Speaker: Thanh Dat Hoang &\; \, Chair: Tasha Gautam Title: Studying physical characteristics of protostar envelopes from TOP100 sampl e with mid- and high-J CO lines Abstract: Most high-mass star forming sites in our galaxy have been identified by the ATLASGAL submm dust continuum su rvey. From this survey\, the TOP100 sample which consists of the brightest sources […] X-ALT-DESC;FMTTYPE=text/html:

Speaker: Thanh Dat Hoang & \, Chair: Tasha Gautam

Title: Studying physical characteristics of protostar envelop es from TOP100 sample with mid- and high-J CO lines

Abstract:
Mo st high-mass star forming sites in our galaxy have been identified by theATLASGAL submm dust continuum survey. From this survey\, the TOP100 sam ple
which consists of the brightest sources in a range of evolutionary stages
was selected. Thereby\, studying the TOP100 sample is a key to probe the
evolutionary sequence of high-mass star formation in our ga laxy. The sources
we are asking to observe here are selected from diff erent evolutionary
groups of the TOP100 sample. Throughout the evoluti onary sequence of high-
mass star formation\, dramatic changes are see n at the warm\, dense inner
region of protostar envelopes and associat ed massive outflows. In order to
probe the warm envelopes\, we need ac cess to mid- and high-J CO lines which
require a certain level of temp erature and density to be excited and these
conditions are likely to e xist in the target envelopes. Those lines are now
accessible with new high frequency receivers at ground-base telescopes as
well as on board of SOFIA. Up to the present\, a number of mid- and high-J
lines of CO and its isotopologues\, which include CO(11-10)\, CO(16-15)\,
13CO(6- 5)\, 13CO(8-7)\, 13CO(10-9)\, C18O(6-5)\, and C18O(9-8)\, have been
ob served. Using RADEX\, we have succeeded in finding one-component models
that can produce well line ratios from 13CO and C18O lines.
However\ , our additional RADEX analyses of high-J CO(11-10) and CO(16-15) transitio ns
hint at the presence of another hot component. That is consistent w ith HERSCHEL/PACS
results that there is no single-component model that can fit all the CO lines.
With the higher-J CO line proposed in this proposal and extra modelling\,
we would be able to explore the hot CO component.

CATEGORIES:MondaySeminar ORGANIZER;CN="pott":MAILTO:pott@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/ms-29/ END:VEVENT BEGIN:VEVENT UID:20190811T1645Z-1565541947.2484-EO-13265-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20190809T085620Z LAST-MODIFIED:20190809T085758Z DTSTART;TZID=Europe/Berlin:20190814T140000 DTEND;TZID=Europe/Berlin:20190814T150000 SUMMARY: How to apply for a Marie Curie Fellowship: Q&A DESCRIPTION: Marie Sklodowka Curie fellow Marion Wienen will answer questio ns about applying for fellowships\, and may give hints. X-ALT-DESC;FMTTYPE=text/html:

Marie Sklodowka Curie fellow Mario n Wienen will answer questions about applying for fellowships\, an d may give hints.

ORGANIZER;CN="rmauersberger":MAILTO:rmauersberger@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/how-to-appl y-for-a-marie-curie-fellowship-qa/ END:VEVENT BEGIN:VEVENT UID:20181115T0935Z-1542274515.5974-EO-13111-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20181112T090735Z LAST-MODIFIED:20190820T101910Z DTSTART;TZID=Europe/Berlin:20190902T130000 DTEND;TZID=Europe/Berlin:20190902T140000 SUMMARY: MS: Monthly Discussion X-ALT-DESC;FMTTYPE=text/html: CATEGORIES:MondaySeminar ORGANIZER;CN="pott":MAILTO:pott@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/ms-30/ END:VEVENT BEGIN:VEVENT UID:20181115T0935Z-1542274515.612-EO-13112-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20181112T090822Z LAST-MODIFIED:20190909T094121Z DTSTART;TZID=Europe/Berlin:20190909T130000 DTEND;TZID=Europe/Berlin:20190909T140000 SUMMARY: MS Koushik Sen DESCRIPTION: Speaker: Koushik Sen &\; \, Chair: Tasha Gautam Title: Ste llar Engineering Abstract: Massive stars play an important role in the evol ution of the Universe: they provide mechanical feedback through strong wind s\, ionize their surrounding ISM by radiation and enrich it with s-process elements via a supernova explosion. However\, the internal mixing processes like semi-convection and overshooting […] X-ALT-DESC;FMTTYPE=text/html:

Speaker: Koushik Sen & \, Chair: Tasha Gau tam

Title: Stellar Engineering

Abstract:
Massive stars pla y an important role in the evolution of the Universe: they provide mechanic al feedback through strong winds\, ionize their surrounding ISM by radiatio n and enrich it with s-process elements via a supernova explosion. However\ , the internal mixing processes like semi-convection and overshooting is no t well constrained\, thereby introducing significant uncertainties in the e volution of massive stars. Particularly\, the post main sequence phase is l ike a magnifying glass which highlights the fallacies in calculations of th e earlier stages of evolution. The fraction of Helium burning lifetime a st ar spends as a Blue or Red Supergiant is strongly dependent on these mixing processes. Through a grid of stellar models\, I try to study the factors w hich influence the Helium burning phase in the evolution of these stars.

CATEGORIES:MondaySeminar ORGANIZER;CN="pott":MAILTO:pott@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/ms-31/ END:VEVENT BEGIN:VEVENT UID:20181115T0935Z-1542274515.6237-EO-13113-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20181112T090922Z LAST-MODIFIED:20190827T093125Z DTSTART;TZID=Europe/Berlin:20190916T130000 DTEND;TZID=Europe/Berlin:20190916T140000 SUMMARY: MS X-ALT-DESC;FMTTYPE=text/html: CATEGORIES:MondaySeminar ORGANIZER;CN="pott":MAILTO:pott@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/ms-32/ END:VEVENT BEGIN:VEVENT UID:20181115T0935Z-1542274515.6359-EO-13114-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20181112T091010Z LAST-MODIFIED:20190923T082215Z DTSTART;TZID=Europe/Berlin:20190923T130000 DTEND;TZID=Europe/Berlin:20190923T140000 SUMMARY: MS Anne-Kathrin Baczko DESCRIPTION: Speaker: Anne Kathrin &\; \, Chair: Koushik Sen Title: Mul ti-wavelengths view of the AGN NGC1052 AGN with a twin-jet system are rare. Even more unusual are those which reveal asymmetries between both jets as well as being absorbed by a surrounding torus. The LINER NGC 1052\, located at a close distance of about 20 Mpc\, is […] X-ALT-DESC;FMTTYPE=text/html:

Speaker: Anne Kathrin & \, Chair: Koushik Sen

Title: Multi-wavelengths view of the AGN NGC1052

AGN with a twin-jet system are rare. Even more unusual are those which
reveal as ymmetries between both jets as well as being absorbed by a
surrounding torus. The LINER NGC 1052\, located at a close distance of
about 20 M pc\, is a source that has both. Does this imply intrinsic
asymmetry an d even infer an asymmetric jet production? One indication
towards this interpretation is the difference in speeds between both
jets observed at 43 GHz (about 0.35c for the eastern jet and 0.57c for
the western one).
I present multi-wavelength observations from 1.4 GHz up to 86GHz to
probe regions on scales from milli-parsec up to several parsecs. I n this
way\, free-free and synchrotron-self absorption can be examined in detail
from a fully obscured inner area at low frequencies to a gl owing central
core in the jet forming regions at higher frequencies. R esolutions down
to 50 micro arc seconds\, thanks to mm-VLBI\, give us access to unknown
regions in which we expect the formation of the twin -jet system.

CATEGORIES:MondaySeminar ORGANIZER;CN="pott":MAILTO:pott@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/ms-33/ END:VEVENT BEGIN:VEVENT UID:20190924T0338Z-1569296311.1887-EO-13451-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20190923T100453Z LAST-MODIFIED:20190923T100647Z DTSTART;TZID=Europe/Berlin:20190926T100000 DTEND;TZID=Europe/Berlin:20190926T110000 SUMMARY: PhD Defense Victoria Yankelevich: Cosmology with the galaxy bispec trum X-ALT-DESC;FMTTYPE=text/html: CATEGORIES:Thesis Defense LOCATION:MPIfR\, Room 0.02 GEO:50.730090;7.069570 ORGANIZER;CN="rmauersberger":MAILTO:rmauersberger@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/victoria-ya nkelevich-cosmology-with-the-galaxy-bispectrum/ END:VEVENT BEGIN:VEVENT UID:20181115T0935Z-1542274515.6458-EO-13115-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20181112T091058Z LAST-MODIFIED:20190930T083716Z DTSTART;TZID=Europe/Berlin:20190930T130000 DTEND;TZID=Europe/Berlin:20190930T140000 SUMMARY: MS Vishnu Balakrishnan DESCRIPTION: Speaker: Vishnu Balakrishnan &\; \, Chair: Anne Kathrin Ti tle: Advanced Techniques to find Relativistic Binary Pulsars Abstract: Rela tivistic binary pulsar systems\, such as double neutron star and neutron st ar-white dwarf binaries are currently some of the best tools available to t est Einstein’s theory of general relativity and the alternative theories of gravity in the strong gravitational […] X-ALT-DESC;FMTTYPE=text/html:

Speaker: Vishnu Balakrishnan & \, Chair: A nne Kathrin

Title: Advanced Techniques to find Relativistic Binary Pu lsars
Abstract: Relativistic binary pulsar systems\, such as double ne utron star and neutron star-white dwarf binaries are currently some of the best tools available to test Einstein's theory of general relativity and th e alternative theories of gravity in the strong gravitational field regime. A radio pulsar with a black hole companion would be a model system for suc h tests because of the immense orbital velocities and gravitational potenti als present. However\, finding such systems is difficult because of their a pparent spin period changes due to the Doppler effect. Acceleration searche s are commonly used to take this into account but still have limited sensit ivity in the case of short orbital period binaries. In this talk\, I will d escribe a new search technique using the stochastic template-bank algorithm that can search coherently for circular binary orbits of any orbital perio d\, thereby increasing our sensitivity to the potential pulsar-black hole b inaries in our galaxy. I will also present some early results using this te chnique on the most sensitive blind pulsar survey to date\, High Time Resol ution Universe Low Latitude (HTRU-S Lowlat) survey which was observed using the Parkes Radio Telescope.

CATEGORIES:MondaySeminar ORGANIZER;CN="pott":MAILTO:pott@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/ms-34/ END:VEVENT BEGIN:VEVENT UID:20191003T2232Z-1570141979.8939-EO-13518-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20191002T125103Z LAST-MODIFIED:20191002T125137Z DTSTART;VALUE=DATE:20191007 DTEND;VALUE=DATE:20191008 SUMMARY: Mental Strategies for doctoral students X-ALT-DESC;FMTTYPE=text/html: CATEGORIES:Softskills LOCATION:MPIfR\, Room 0.02 GEO:50.730090;7.069570 ORGANIZER;CN="rmauersberger":MAILTO:rmauersberger@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mental-stra tegies-for-doctoral-students/ END:VEVENT BEGIN:VEVENT UID:20191003T2232Z-1570141979.9225-EO-13519-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20191002T125238Z LAST-MODIFIED:20191002T125333Z DTSTART;TZID=Europe/Berlin:20191007T110000 DTEND;TZID=Europe/Berlin:20191007T120000 SUMMARY: Guided meditation X-ALT-DESC;FMTTYPE=text/html: CATEGORIES:Softskills LOCATION:MPIfR\, room 0.01 GEO:50.730090;7.069570 ORGANIZER;CN="rmauersberger":MAILTO:rmauersberger@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/guided-medi tation/ END:VEVENT BEGIN:VEVENT UID:20191003T2232Z-1570141979.9303-EO-13520-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20191002T125427Z LAST-MODIFIED:20191002T125427Z DTSTART;TZID=Europe/Berlin:20191008T103000 DTEND;TZID=Europe/Berlin:20191008T110000 SUMMARY: Guided meditation X-ALT-DESC;FMTTYPE=text/html: LOCATION:MPIfR\, room 0.01 GEO:50.730090;7.069570 ORGANIZER;CN="rmauersberger":MAILTO:rmauersberger@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/guided-medi tation-2/ END:VEVENT BEGIN:VEVENT UID:20191003T2232Z-1570141979.938-EO-13521-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20191002T125520Z LAST-MODIFIED:20191002T125925Z DTSTART;TZID=Europe/Berlin:20191009T130000 DTEND;TZID=Europe/Berlin:20191010T160000 SUMMARY: Gesund führen\, so bleiben Sie und Ihr Team motiviert und leistung sstark DESCRIPTION: Zielgruppe: Direktoren\, Abteilungsleiter\, Gruppenleiter\, Pr omotionsbetreuer*innen X-ALT-DESC;FMTTYPE=text/html:

Zielgruppe: Direktoren\, Abteilungsleiter\ , Gruppenleiter\, Promotionsbetreuer*innen

CATEGORIES:Softskills LOCATION:MPIfR\, Room 0.02 GEO:50.730090;7.069570 ORGANIZER;CN="rmauersberger":MAILTO:rmauersberger@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/guided-medi tation-3/ END:VEVENT BEGIN:VEVENT UID:20191010T1608Z-1570723712.3026-EO-13540-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20191010T141017Z LAST-MODIFIED:20191010T141017Z DTSTART;TZID=Europe/Berlin:20191011T100000 DTEND;TZID=Europe/Berlin:20191011T110000 SUMMARY: Thesis Defense: Enrico Garaldi DESCRIPTION: From galaxies to the cosmic web   Astrophysical phenomena occu r on a large variety of spatial scales. Although ubiquitous\, the interacti on between them is often neglected because of the difficulties in their sim ultaneous modeling. In this talk I will very briefly describe three cases w here this interplay is of primary importance\, namely: the assembly bias\, the […] X-ALT-DESC;FMTTYPE=text/html:

From galaxies to the cosmic web

 

Astrophysical phenomena occur on a large variety of sp atial scales. Although ubiquitous\, the interaction between them is often n eglected because of the difficulties in their simultaneous modeling. In thi s talk I will very briefly describe three cases where this interplay is of primary importance\, namely: the assembly bias\, the radial acceleration re lation and the epoch of cosmic reionization. Then\, I will focus on assembl y bias and present a detailed numerical investigation of its effect on dark matter halo and galaxies.
Assembly bias denotes the fact that dark ma tter haloes of the same mass have clustering properties that depend on thei r formation time. This effect is due to the cosmic environment of such halo es\, that halts the accretion of new material in regions where the tidal fi eld exerted by nearby structures is strong. Therefore\, the assembly of obj ects strongly clustered is more efficiently suppressed. In this Thesis\, we study the properties of satellite galaxies that reside within haloes with different assembly histories\, and therefore cosmic environments. We show t hat their content is insensitive to the large-scale geometry of the matter distribution. However\, the latter has a strong impact on the satellite dyn amics\, producing a preferentially-radial motion in objects embedded in a k not of the cosmic web\, and isotropically-distributed velocities in region within filaments. We apply this knowledge to the satellites of the Milky Wa y and infer that our Galaxy resides in a prominent filamentary structure. CATEGORIES:Thesis Defense LOCATION:AIfA Lecture hall 0.012 GEO:50.733631;7.060133 ORGANIZER;CN="rmauersberger":MAILTO:rmauersberger@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/thesis-defe nse-enrico-garaldi/ END:VEVENT BEGIN:VEVENT UID:20191010T1608Z-1570723712.3132-EO-13539-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20191010T122557Z LAST-MODIFIED:20191010T122726Z DTSTART;TZID=Europe/Berlin:20191011T120000 DTEND;TZID=Europe/Berlin:20191011T122000 SUMMARY: Meet the speaker: Aurélien Hees DESCRIPTION: Aurélien Hees\, has agreed to be available after his colloquiu m talk for another 20 minutes in room 0.02 to chat with PhD researchers. To pics may include scientific questions related to his work but also career a dvice (Aurélien has lived in Belgium\, South Africa\, the USA and is now in France). Even if you have no question\, […] X-ALT-DESC;FMTTYPE=text/html:

Aurélien Hees\, has agreed to be available after his colloquium talk for another 20 minutes in room 0.02 to chat with PhD researchers. Topics may include scientific questions related to his wo rk but also career advice (Aurélien has lived in Belgium\, South Africa\, t he USA and is now in France). Even if you have no question\, it would be a good opportunity for networking.

CATEGORIES:IMPRS LOCATION:MPIfR\, Room 0.02 GEO:50.730090;7.069570 ORGANIZER;CN="rmauersberger":MAILTO:rmauersberger@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/meet-the-sp eaker-aurelien-hees/ END:VEVENT BEGIN:VEVENT UID:20190313T2157Z-1552514276.6022-EO-13196-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20190313T120539Z LAST-MODIFIED:20191014T074514Z DTSTART;TZID=Europe/Berlin:20191014T130000 DTEND;TZID=Europe/Berlin:20191014T140000 SUMMARY: Monday Seminar Ivana Beslic – ISM in molecular phase at high resol ution DESCRIPTION: Speaker: Ivana Beslic \, Chair: Vishnu Balakrishnan Title: ISM in molecular phase at high resolution: Molecular Clouds\, Star Formation a nd Dense Gas at Arcsecond-Scale Across NGC 3627 Abstract: We present new NO rthern Extended Millimeter Array (NOEMA) observations towards a nearby (~11 Mpc)\, large (Mmolecular~1010.5M_sun)\, actively star-forming (SFR~2M_sun y r-1) disc Galaxy – NGC3627. These observations currently represent the […] X-ALT-DESC;FMTTYPE=text/html:

Speaker: Ivana Beslic \, Chair: Vishnu Bal akrishnan

Title: ISM in molecular phase at high resolution: Molecular Clouds\, Star Formation
and Dense Gas at Arcsecond-Scale Across NGC 3 627

Abstract: We present new NOrthern Extended Millimeter Array (NOEM A)
observations towards a nearby (~11Mpc)\, large (Mmolecular~1010.5M_ sun)\,
actively star-forming (SFR~2M_sun yr-1) disc Galaxy - NGC3627. These
observations currently represent the highest angular resolution (1.8 arcsec
- 95 parsec)\, full-galaxy mosaic of dense gas tracers. Th is initial project
aims to study the physical conditions of the dense gas within individual
molecular clouds\, and to fill in the gap in our understanding of dense gas
over Galactic and extragalactic scales. We will make use of a large number
of ancillary observations towards NGC 3627 - such as from the IRAM-30m large
project EMPIRE\, and the recent ALMA large project PHANGS - which will allow
us to place constraints on how the dense gas tracers correlate with
molecular gas tracers\, st ar formation rate and how they are related to
physical conditions
within molecular clouds.

CATEGORIES:IMPRS,MondaySeminar ORGANIZER;CN="pott":MAILTO:pott@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/monday-semi nar-2/ END:VEVENT BEGIN:VEVENT UID:20190313T2157Z-1552514276.6351-EO-13197-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20190313T120617Z LAST-MODIFIED:20191022T063444Z DTSTART;TZID=Europe/Berlin:20191021T130000 DTEND;TZID=Europe/Berlin:20191021T140000 SUMMARY: Monday Seminar Hannah Zohren DESCRIPTION: IMPRS talk by Hannah Zohren\, Chair: Ivana Title: Galaxy Clust ers – Weak Lensing Mass Constraints Galaxy clusters provide a versatile bas is for studies of the cosmological parameters that govern the Universe. Det ections based on the Sunyaev Zel’dovich (SZ) effect allow us to find cluste rs at very high redshift. These enable astrophysical and cosmological inves tigations that can […] X-ALT-DESC;FMTTYPE=text/html:

IMPRS talk by Hannah Zohren\, Chair: Ivana

Title: Galaxy Clusters - Weak Lensing Mass Constraints
Galaxy c lusters provide a versatile basis for studies of the cosmological parameter s that govern the Universe. Detections based on the Sunyaev Zel'dovich (SZ) effect allow us to find clusters at very high redshift. These enable astro physical and cosmological investigations that can expand on our current kno wledge from lower redshift.

In my talk\, I will briefly outline our s trategy to obtain HST based weak lensing mass estimates for the 9 high reds hift clusters (z>1.2) with the highest SZ-significance in the 2500 deg2 SPT -SZ Survey. I will particularly focus on the aspect of a proper source sele ction in order to distinguish the background galaxies which carry the weak lensing signal from the foreground and cluster galaxies which dilute the si gnal if they are not removed from the measurements.
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Talk by Nordia-Jazmin Ordonez-Toro\, University of Guan ajuato (UG)\, Mexico

Title: Astrometric studies of binary young stell ar objects using VLBI.

Abstract:
Studying binary and multiple st ars require observations with high angular resolution and high astrometric accuracy\, for this\, the Gaia satellite provides orbital parameters when t he stars have a separation above 0.1 arc-seconds\, but Systems with smaller separations need to be studied with techniques that provide higher angular resolution observations\, because the models seem to underestimate the mas ses of these systems.
The Very Long Baseline Array (VLBA) provides ang ular resolutions around 0.001 arc-seconds and better astrometric precisions \, it is ideal to study this type of star systems\, therefore the observati on with VLBI allows us to determine the dynamical masses of YSOs in differe nt star forming regions by using the Very Long Baseline Interferometry tech nique. The resulting masses will be used to test evolutionary models of YSO s.
-------------------------------

Talk by Vanessa Yanza-Lopez\, University of Guanajuato\, Mexico

Title: Identification and classifi cation of compact radio sources in M17 region with VLA observations.

Abstract:
At radio wavelengths we can detect different emission mechan ism of celestial objects\, such as thermal emission and non thermal emissio n. In particular\, in HII regions is important to know what is the emission mechanism of the compact sources because allow us to know: Which sources b elong or not to the region?\, What role do these compact sources play in th e region itself?\, What is the type of emission mechanism that dominates? S o in this work\, I'm studying the compact sources in an specific region\, t he M17 region\, that is a giant molecular cloud relatively close to through VLA observations.

CATEGORIES:IMPRS,MondaySeminar ORGANIZER;CN="pott":MAILTO:pott@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/monday-semi nar-3/ END:VEVENT BEGIN:VEVENT UID:20190313T2157Z-1552514276.6595-EO-13198-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20190313T120658Z LAST-MODIFIED:20191104T073649Z DTSTART;TZID=Europe/Berlin:20191028T130000 DTEND;TZID=Europe/Berlin:20191028T140000 SUMMARY: Monday Seminar Joscha Jahns & Monthly discussion DESCRIPTION: Speaker: Joscha Jahns\, Chair: Hannah Zohren Title: Fast Radio Bursts Abstract: Fast radio bursts (FRBs) are an enigmatic new class of ra dio transients. They are very bright but only a few milliseconds long and c ome from galaxies at ~Gpc distance. Although there have been about a hundre d observed by now\, their origin is still unknown. In […] X-ALT-DESC;FMTTYPE=text/html:

Speaker: Joscha Jahns\, Chair: Hannah Zohr en

Title: Fast Radio Bursts

Abstract:

Fast radio bursts ( FRBs) are an enigmatic new class of radio transients. They are very bright but only a few milliseconds long and come from galaxies at ~Gpc distance. A lthough there have been about a hundred observed by now\, their origin is s till unknown.

In this talk I will focus on a general introduction\, t he recent history of FRBs\, and give a short outlook of the work I will be doing with observations of "the repeater".

-------------------------- -------------------------------

Topics to be discussed in the monthly discussion are:

1) Inputs for upcoming PhDnet meeting - I request al l the students to think of any concerns you may have as an IMPRS PhD studen t which could be raised in the meeting

2) Distribution of IMPRS survi val guide to new students

3) Update on conference style Monday Semina rs

4) IMPRS social activities - suggestions welcomed

CATEGORIES:IMPRS,MondaySeminar ORGANIZER;CN="pott":MAILTO:pott@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/monday-semi nar-4/ END:VEVENT BEGIN:VEVENT UID:20190313T2157Z-1552514276.6683-EO-13199-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20190313T120735Z LAST-MODIFIED:20191104T074421Z DTSTART;TZID=Europe/Berlin:20191104T130000 DTEND;TZID=Europe/Berlin:20191104T140000 SUMMARY: Monday Seminar: Monthly Discussion X-ALT-DESC;FMTTYPE=text/html: CATEGORIES:IMPRS,MondaySeminar ORGANIZER;CN="pott":MAILTO:pott@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/monday-semi nar-5/ END:VEVENT BEGIN:VEVENT UID:20190313T2157Z-1552514276.6916-EO-13200-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20190313T120807Z LAST-MODIFIED:20191112T074227Z DTSTART;TZID=Europe/Berlin:20191111T130000 DTEND;TZID=Europe/Berlin:20191111T140000 SUMMARY: Monday Seminar Richa Sharma DESCRIPTION: Speaker: Richa Sharma\, Chair: Tasha Gautam Title: Exploring i nclination-dependent properties of self-absorbed radio jets Abstract: We st udy the dependence of the spectral characteristics of a self-absorbed jet o n the inclination angle of the jet. For this purpose\, we work with a physi cal model of a synchrotron emitting conical jet. We study the properties of the jet […] X-ALT-DESC;FMTTYPE=text/html:

Speaker: Richa Sharma\, Chair: Tasha Gauta m
Title: Exploring inclination-dependent properties of self-absorbed r adio jets

Abstract:

We study the dependence of the spectral cha racteristics of a self-absorbed jet
on the inclination angle of the je t. For this purpose\, we work with a physical
model of a synchrotron e mitting conical jet. We study the properties of the jet
for two cases\ , magnetic field parallel and perpendicular to the jet axis. In
this t alk\, I will present my results based on this jet model. We find that thecore position for a particular frequency is closer to the base of the j et for
small inclination angles and moves farther away from the base a t larger angles.
We also find that the spectra of the jet is flat/inve rted for small inclination
angles but is unable to retain this self-ab sorbed property of the jet at larger
angles.

CATEGORIES:IMPRS,MondaySeminar ORGANIZER;CN="pott":MAILTO:pott@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/monday-semi nar-6/ END:VEVENT BEGIN:VEVENT UID:20190313T2157Z-1552514276.7019-EO-13201-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20190313T120842Z LAST-MODIFIED:20191118T102425Z DTSTART;TZID=Europe/Berlin:20191118T130000 DTEND;TZID=Europe/Berlin:20191118T140000 SUMMARY: Monday Seminar Christopher Heiter & Tim Sprenger DESCRIPTION: Christopher Heiter Title: Design of a Novel Multiband Heterody n Receiver System for the APEX Telescope Abstract: As contribution to the A PEX-II refurbishment MPIfR will deliver NFLASH\, a state-of-the-art multico lor heterodyne spectrometer that will provide unique science opportunities to the APEX communities. The receiver allows simultaneous dual polarization observation in the frequency bands from 195-270 GHz and […] X-ALT-DESC;FMTTYPE=text/html:

Christopher Heiter

Title: Design of a Novel Multiband Heterodyn Receiver System for the APEX Telescope

Ab stract:
As contribution to the APEX-II refurbishment MPIfR will delive r NFLASH\, a state-of-the-art multicolor heterodyne spectrometer that will provide unique science opportunities to the APEX communities. The receiver allows simultaneous dual polarization observation in the frequency bands fr om 195-270 GHz and 385-510 GHz with an instantaneous bandwidth of 32+16 GHz . Using a dichroic select optics system the receiver can be expanded by a 8 50 GHz receiver which will enlarge the RF coverage for simultaneous observa tion. The 850 GHz channel will operate in the band from 780-950 GHz (ALMA b and 10) using 2SB SIS mixers which will be partly produced in the MPIfR wor kshop.
Due to the modular structure of the receiver system observation s for each combination of frequency bands can be performed resulting in hig h flexibility for specific scientific use cases and fast measurements.

< p>In this talk the receiver system will be introduced and pre commissioning results will be presented. This includes beside others the progress of the in house 2SB mixer block production for ALMA band 10. After the talk there will be a lab tour providing the opportunity to take a look inside the NFL ASH cryostat and to ask questions on the receiver.

 

Speaker: T im Sprenger\, Chair: Christopher Heiter
Title: Scintillometry: A gentl e Introduction

Abstract:

The word scintillometry refers to meth ods that use scintillation
phenomena as their primary source of inform ation. Scintillation is an
oscillatory amplitude variation of compact sources of radiation due to
the interference of different paths of pro pagation through an
intervening scattering medium. It can not only pro vide information about
the scattering medium but also about the spatia l structure and velocity
of the source.

In this talk I will give an introduction to the basic concepts of
scintillometry with pulsars\ , whose radio emission is affected by
small-scale (~mas) diffracting m aterial in the ISM of yet unknown
origin. I will also show one of my e arly results of trying to image
interstellar scattering screens.

CATEGORIES:IMPRS,MondaySeminar ORGANIZER;CN="pott":MAILTO:pott@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/monday-semi nar-7/ END:VEVENT BEGIN:VEVENT UID:20190313T2157Z-1552514276.7141-EO-13202-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20190313T120915Z LAST-MODIFIED:20191126T075503Z DTSTART;TZID=Europe/Berlin:20191125T130000 DTEND;TZID=Europe/Berlin:20191125T140000 SUMMARY: Monday Seminar Parichay Mazumdar DESCRIPTION: Parichay Mazumdar\, Chair: Tim Sprenger Title: LAsMA observati ons of the G305 star forming complex Abstract: High-mass stars (M > 8 M_sol ar) are predominantly observed in young (≤20 Myr)\, massive clusters (M ≥ 1 0^3 M_solar) located within giant molecular clouds (GMCs). Despite their ra rity and short lifetimes\, high-mass stars are responsible for injecting a significant amount of […] X-ALT-DESC;FMTTYPE=text/html:

Parichay Mazumdar\, Chair: Tim Sprenger

Title: LAsMA observations of the G305 star forming complex

Abstra ct: High-mass stars (M > 8 M_solar) are predominantly observed in young
(≤20 Myr)\, massive clusters (M ≥ 10^3 M_solar) located within giant mole cular
clouds (GMCs). Despite their rarity and short lifetimes\, high-m ass stars are
responsible for injecting a significant amount of energy into the
interstellar medium (ISM) by means of stellar winds\, ionizi ng radiation and
supernovae. The impact of such feedback mechanisms fr om high-mass stars on
the ISM and star formation is still a topic of d ebate but is thought to play
an important role in driving the evolutio n of GMCs. G305 is one of the most
massive and luminous active star fo rming Giant Molecular Cloud complex in the
Milky Way. It consists of a number of molecular cloud surrounding a cavity
centered on two visibl e star clusters Dank 1 and Dank 2 and a Wolf-Rayet star
WR48a which se em to be driving the expansion of this cavity. Many signposts
of star formation are coincident with G305\, e.g. IR hotspots\; UC HII regions\;
water\, OH\, and methanol masers. This makes G305 an excellent laborator y to
investigate the nature of star-formation and its impact on the en vironment
and in turn the formation of future generation of stars. In this talk\, I will
be presenting some results from 13CO(2-1) and 12CO( 2-1) observations of the
G305 complex done with the APEX telescope.

CATEGORIES:IMPRS,MondaySeminar ORGANIZER;CN="pott":MAILTO:pott@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/monday-semi nar-8/ END:VEVENT BEGIN:VEVENT UID:20190313T2157Z-1552514276.7221-EO-13203-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20190313T120948Z LAST-MODIFIED:20190401T083634Z DTSTART;TZID=Europe/Berlin:20191202T130000 DTEND;TZID=Europe/Berlin:20191202T140000 SUMMARY: Monday Seminar & Monthly Discussion X-ALT-DESC;FMTTYPE=text/html: CATEGORIES:IMPRS,MondaySeminar ORGANIZER;CN="pott":MAILTO:pott@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/monday-semi nar-9/ END:VEVENT BEGIN:VEVENT UID:20191031T2212Z-1572559941.2633-EO-13555-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20191031T114257Z LAST-MODIFIED:20191031T114349Z DTSTART;TZID=Europe/Berlin:20191203T100000 DTEND;TZID=Europe/Berlin:20191203T130000 RRULE:FREQ=DAILY;INTERVAL=1;UNTIL=20191205T090000Z SUMMARY: Astronomical Instruments – how they are planned\, built and tested DESCRIPTION: Lecturer: Dr. Carlos Durán   Day 1 (10:00 – 11:15  +  11:30 – 12:45) 1. Drivers for a telescope (and instrumentation) Scientific Interest Technology Interface and Specification. Project Management 2. Constraints\ , limitations and barriers Technology &\; technics Site (Atmosphere) Mo ney Logistics &\; Operation Competitors / use. 3. Telescopes and config urations Single Dish / Arrays Ground-base / […] X-ALT-DESC;FMTTYPE=text/html:

Lecturer: Dr. Carlos Durán

 

Day 1 (10:00 – 11:15  +  11:30 – 12:45)

1. Drivers for a telescope (and instrumentation)

  • Scientific Interest
  • Technology
  • Interface and Specification.
  • Pr oject Management

2. Constraints\, limitations and barriers

< ul>
  • Technology & technics
  • Site (Atmosphere)
  • Money
    • Logistics & Operation
  • Competitors / use.

    • 3. Telescope s and configurations

    • Single Dish / Arrays
    • Ground-base / Air- Balloon borned / Space

    4. Testing\, Commissioning and Acce ptance.

    • Key concepts

    5. Operation: The non-visible b ackstage.

    • Data Handling\, Calibration and Archiving
    • Surf ace accuracy and efficiencies
    • Pointing and Atmospheric models
      • < li>Power
    • Cryogenics

    Day 2 (10:00 – 11:15  +  11 :30 – 12:45)

    1. Receiver Technology used in (Radio) Astronom y

    • Front-end
      • Heterodynes (single pixel and arrays)
      • Calorimeters / Bolometers
    • Backends
      • Spectrometers: AOS / FFTs
      • Correlators (Auto and Cross)
      • ADC and Total powe r detectors.

    2. The need of low temperature: Cryostat and Cryogenics

    3. (Quasi) Optics\, Telescope Coupling and interfacin g.

    4. The design of an instrument.

    Modeling and simulations

    Selection of Components

    Optics Design (Mirrors\, filters\, windows \, etc)

    Mechanical design

    Electronics and Electrical Interfacin g

    Software

    5. Tune up\, characterization and commissioning

    < p>Lab Tests and Operation points

    Merit figures: Allan Variance\, T_Re c\, Thermo/mech. Stabilities. Uncertainties

    Commissioning.

     

    DAY 3: 10h

     

    Receiver lab visit

    CATEGORIES:Blackboard LOCATION:MPIfR\, Room 0.02 GEO:50.730090;7.069570 ORGANIZER;CN="rmauersberger":MAILTO:rmauersberger@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/astronomica l-instruments-how-they-are-planned-built-and-tested/ END:VEVENT BEGIN:VEVENT UID:20190313T2157Z-1552514276.7525-EO-13204-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20190313T121023Z LAST-MODIFIED:20191209T131733Z DTSTART;TZID=Europe/Berlin:20191209T130000 DTEND;TZID=Europe/Berlin:20191209T140000 SUMMARY: Monday Seminar Stefano Ebagezio DESCRIPTION: Speaker: Stefano Ebagezio\, Chair: Parichay Mazumdar Title: “S ynthetic Observations of Molecular Clouds: Chemical Tracers of Different Ph ases”. Abstract: “Molecular Clouds (MCs) are complex astronomical environme nts. They are the place of star formation and a lot of different physical p rocesses\, such as gravitational collapses\, stellar winds\, and supernovae explosions\, take place there. Furthermore\, several hundreds of different […] X-ALT-DESC;FMTTYPE=text/html:

    Speaker: Stefano Ebagezio\, Chair: Paricha y Mazumdar

    Title: "Synthetic Observations of Molecular Clouds: Chemic al Tracers of
    Different Phases".

    Abstract: "Molecular Clouds (MC s) are complex astronomical environments. They
    are the place of star f ormation and a lot of different physical processes\,
    such as gravitati onal collapses\, stellar winds\, and supernovae explosions\,
    take plac e there. Furthermore\, several hundreds of different chemical species
    have been detected and the reaction network is thought to be very complex.< br />The "SILCC" project aims to numerically simulate the life-cycle of MCs and
    several synthetic clouds have already been created. These simulat ed clouds
    also include a complex chemical network and\, therefore\, sy nthetic
    observations of the simulated chemical species can be produced . Comparisons
    between those synthetic observations and the simulation data permit to
    understand which species are most efficient to trace th e different phases of
    the MCs."

    CATEGORIES:IMPRS,MondaySeminar ORGANIZER;CN="pott":MAILTO:pott@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/monday-semi nar-10/ END:VEVENT BEGIN:VEVENT UID:20190313T2157Z-1552514276.7583-EO-13205-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20190313T121104Z LAST-MODIFIED:20190806T132141Z DTSTART;TZID=Europe/Berlin:20191216T130000 DTEND;TZID=Europe/Berlin:20191216T140000 SUMMARY: Monday Seminar Tsan-Ming Wang X-ALT-DESC;FMTTYPE=text/html: CATEGORIES:IMPRS,MondaySeminar ORGANIZER;CN="pott":MAILTO:pott@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/monday-semi nar-11/ END:VEVENT BEGIN:VEVENT UID:20200106T1656Z-1578329769.8223-EO-13584-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20200106T093603Z LAST-MODIFIED:20200106T093603Z DTSTART;TZID=Europe/Berlin:20200129T090000 DTEND;TZID=Europe/Berlin:20200129T123000 SUMMARY: IMPRS seminar Conference Style DESCRIPTION: 9:00-10:30 – 3 talks for 30 mins each 10:30-11:00 – Coffee/Sna cks Break 11:00-12:30 – 3 more talks for 30 mins each List of speakers givi ng their 1st IMPRS talks are: – Rohit Dokara – Xiao-Tian Xu – Mark Schnitzl er – Timea Kovacs – Shalini Sengupta – Tsan-Ming X-ALT-DESC;FMTTYPE=text/html:

    9:00-10:30 - 3 talks for 30 mins each
    10:30-11:00 - Coffee/Snacks Break
    11:00-12:30 - 3 more talks for 30 m ins each

    List of speakers giving their 1st IMPRS talks are:

    - R ohit Dokara
    - Xiao-Tian Xu
    - Mark Schnitzler
    - Timea Kovacs< br />- Shalini Sengupta
    - Tsan-Ming

    CATEGORIES:IMPRS ORGANIZER;CN="pott":MAILTO:pott@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/imprs-semin ar-conference-style/ END:VEVENT BEGIN:VEVENT UID:20200212T1306Z-1581512797.2659-EO-13602-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20200212T102942Z LAST-MODIFIED:20200212T102942Z DTSTART;TZID=Europe/Berlin:20200214T130000 DTEND;TZID=Europe/Berlin:20200214T160000 SUMMARY: Mental Strategies for Doctoral Researchers X-ALT-DESC;FMTTYPE=text/html: CATEGORIES:IMPRS,Softskills ORGANIZER;CN="pott":MAILTO:pott@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mental-stra tegies-for-doctoral-researchers/ END:VEVENT BEGIN:VEVENT UID:20200212T1306Z-1581512797.2741-EO-13603-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20200212T103033Z LAST-MODIFIED:20200212T103033Z DTSTART;TZID=Europe/Berlin:20200221T130000 DTEND;TZID=Europe/Berlin:20200221T160000 SUMMARY: Mental Strategies for Doctoral Researchers X-ALT-DESC;FMTTYPE=text/html: CATEGORIES:IMPRS,Softskills ORGANIZER;CN="pott":MAILTO:pott@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mental-stra tegies-for-doctoral-researchers-2/ END:VEVENT BEGIN:VEVENT UID:20200212T1306Z-1581512797.2813-EO-13604-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20200212T103118Z LAST-MODIFIED:20200212T103118Z DTSTART;TZID=Europe/Berlin:20200228T130000 DTEND;TZID=Europe/Berlin:20200228T160000 SUMMARY: Mental Strategies for Doctoral Researchers X-ALT-DESC;FMTTYPE=text/html: CATEGORIES:IMPRS,Softskills ORGANIZER;CN="pott":MAILTO:pott@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mental-stra tegies-for-doctoral-researchers-3/ END:VEVENT BEGIN:VEVENT UID:20200212T0927Z-1581499653.356-EO-13594-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20200212T073056Z LAST-MODIFIED:20200212T073056Z DTSTART;TZID=Europe/Berlin:20200312T090000 DTEND;TZID=Europe/Berlin:20200313T170000 SUMMARY: How to teach and tutor successfully DESCRIPTION: Dr. Hendrik den Ouden will give a course on how to teach and t utor successully. X-ALT-DESC;FMTTYPE=text/html:

    Dr. Hendrik den Ouden will give a course o n how to teach and tutor successully.

    CATEGORIES:IMPRS,Softskills ORGANIZER;CN="pott":MAILTO:pott@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/how-to-teac h-and-tutor-successfully/ END:VEVENT BEGIN:VEVENT UID:20200212T0927Z-1581499653.3654-EO-13596-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20200212T073257Z LAST-MODIFIED:20200212T123255Z DTSTART;TZID=Europe/Berlin:20200424T130000 DTEND;TZID=Europe/Berlin:20200424T190000 SUMMARY: Science to data science workshop X-ALT-DESC;FMTTYPE=text/html: CATEGORIES:IMPRS,Softskills ORGANIZER;CN="pott":MAILTO:pott@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/science-to- data-science-workshop-alumni-talks/ END:VEVENT BEGIN:VEVENT UID:20210406T2110Z-1617743439.006-EO-13809-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20210406T093458Z LAST-MODIFIED:20210406T093458Z DTSTART;TZID=Europe/Berlin:20210414T130000 DTEND;TZID=Europe/Berlin:20210421T160000 SUMMARY: Efficiency Skills for Scientists DESCRIPTION: Usually\, scientists don’t do their research for the money\, b ut because they are passionately curious and feel the drive to explore. Thi s drive can often be sabotaged by the clutter of daily work life: doing pap erwork\, waiting for equipment/time slots/co-workers or getting assignments which not related to your project at all. The assumption for this workshop […] X-ALT-DESC;FMTTYPE=text/html:

    Usually\, scientists don’t do their resear ch for the money\, but because they are passionately curious and feel the d rive to explore. This drive can often be sabotaged by the clutter of daily work life: doing paperwork\, waiting for equipment/time slots/co-workers or getting assignments which not related to your project at all. The assumpti on for this workshop is that you like what you do. Therefore\, the goal of this workshop is to identify ways and strategies that allow you to spend mo st of your time on doing what you like – and reduce the time you spend on d oing ‘the rest’. In the course of the workshop\, we will focus on how to ge t back to the essentials.

    CATEGORIES:IMPRS,Softskills ORGANIZER;CN="pott":MAILTO:pott@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/efficiency- skills-for-scientists/ END:VEVENT BEGIN:VEVENT UID:20210406T2110Z-1617743439.0388-EO-13811-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20210406T093655Z LAST-MODIFIED:20210922T073007Z DTSTART;VALUE=DATE:20211208 DTEND;VALUE=DATE:20211212 SUMMARY: Annual IMPRS Retreat this year to Ringberg Castle X-ALT-DESC;FMTTYPE=text/html: CATEGORIES:IMPRS,Retreat ORGANIZER;CN="pott":MAILTO:pott@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/annual-impr s-retreat-this-year-to-ringberg-castle/ END:VEVENT BEGIN:VEVENT UID:20220609T2127Z-1654810061.3605-EO-14023-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20220608T135856Z LAST-MODIFIED:20220608T140420Z DTSTART;VALUE=DATE:20220623 DTEND;VALUE=DATE:20220624 SUMMARY: Excursion to Effelsberg and Stockert Observatories DESCRIPTION: IMPRS Students will visit the Radiotelescopes in Effelsberg an d on Stockert un a full day bus tour. X-ALT-DESC;FMTTYPE=text/html:

    IMPRS Students will visit the Radiotelescopes in Effelsberg and on Stockert un a full day bus tour.

    CATEGORIES:Excursion ORGANIZER;CN="rmauersberger":MAILTO:rmauersberger@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/excursion-t o-effelsberg-and-stockert-observatories/ END:VEVENT BEGIN:VEVENT UID:20220609T2127Z-1654810061.3978-EO-14025-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20220608T140107Z LAST-MODIFIED:20220608T140559Z DTSTART;VALUE=DATE:20220719 DTEND;VALUE=DATE:20220720 SUMMARY: Full day Excursion to Research Center Jülich DESCRIPTION: IMPRS will organize a full-day excursion to the Jülich Researc h Center\, where we will learn about new energy-saving technologies. X-ALT-DESC;FMTTYPE=text/html:

    IMPRS will organize a full-day excursion t o the Jülich Research Center\, where we will learn about new energy-saving technologies.

    CATEGORIES:Excursion ORGANIZER;CN="rmauersberger":MAILTO:rmauersberger@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/fill-day-ex cursion-to-research-center-julich/ END:VEVENT BEGIN:VEVENT UID:20220819T0949Z-1660902543.098-EO-14104-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20220818T110441Z LAST-MODIFIED:20220818T140945Z DTSTART;TZID=Europe/Berlin:20220829T100000 DTEND;TZID=Europe/Berlin:20220829T110000 SUMMARY: Thesis Defense: Parichay Mazumdar DESCRIPTION: Parichay Mazumdar from the mm/sub-mm group will defend his the sis on “A LAsMA survey of the Milky Way: Effects of feedback on molecular c louds“. X-ALT-DESC;FMTTYPE=text/html:

    Parichay Mazumdar from the mm/sub-mm group will defend his thesis on "A LAsMA survey of the Milky Way: Effects of feedback on molecular clouds".

    CATEGORIES:Thesis Defense LOCATION:https://uni-bonn.zoom.us/j/64117152791?pwd=SmEvSmhsSWJUOExVT2pycW1Ka0dEZz09 GEO:52.520007;13.404954 ORGANIZER;CN="rmauersberger":MAILTO:rmauersberger@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/thesis-defe nse-parichay-mazumdar/ END:VEVENT BEGIN:VEVENT UID:20220815T1213Z-1660565611.3336-EO-14095-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20220815T113511Z LAST-MODIFIED:20220815T123958Z DTSTART;TZID=Europe/Berlin:20220915T160000 DTEND;TZID=Europe/Berlin:20220915T170000 SUMMARY: IMPRS Career Event: Life in industry: what is it\, how is it\, and is it something for me? DESCRIPTION: Dr. Leo Meyer\, alumnus of the IMPRS\, will share his experien ce with moving from academia to industry. Leo has been exceptionally succes sful in both career paths. After finishing his Ph.D. a the University of Co logne in 2008\, he spent one year at the University of California Los Angel es for his postdoc. Subsequently\, he worked for two […] X-ALT-DESC;FMTTYPE=text/html:

    Dr. Leo Meyer\, alumnus of the IMPRS\, wil l share his experience with moving from academia to industry. Leo has been exceptionally successful in both career paths. After finishing his Ph.D. a the University of Cologne in 2008\, he spent one year at the University of California Los Angeles for his postdoc. Subsequently\, he worked for two ye ars in finance and consulting until he returned to UCLA\, now in the role o f an associate researcher. There\, he shaped many scientific projects in th e UCLA Galactic Center Group of Prof. Andrea Ghez (Nobel Laureate of 2020). In 2014\, he returned to Germany where he started to work for DHL. He curr ently is the Vice President for Pricing of DHL.

    CATEGORIES:Career event ORGANIZER;CN="rmauersberger":MAILTO:rmauersberger@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/imprs-caree r-event-life-in-industry-what-is-it-how-is-it-and-is-it-something-for-me/ END:VEVENT BEGIN:VEVENT UID:20220818T1037Z-1660819063.4357-EO-14101-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20220818T082317Z LAST-MODIFIED:20220818T134447Z DTSTART;TZID=Europe/Berlin:20221004T100000 DTEND;TZID=Europe/Berlin:20221006T113000 SUMMARY: Astronomical Instruments: How they work\, how they are planned\, b uilt and testd DESCRIPTION: IMPRS alumnus Dr. Carlos Durán\, station manager of the APEX t elescope\,  will introduce us to the secrets of building and testing astron omical instrumentation. 2 morrings: 4.Oct and 6.Oct. 2022 X-ALT-DESC;FMTTYPE=text/html:

    IMPRS alumnus Dr. Carlos Durán\, station m anager of the APEX telescope\,  will introduce us to the secrets of buildin g and testing astronomical instrumentation. 2 morrings: 4.Oct and 6.Oct. 20 22

    CATEGORIES:Blackboard LOCATION:MPIfR\, Room 0.02 GEO:50.730090;7.069570 ORGANIZER;CN="rmauersberger":MAILTO:rmauersberger@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/astronomica l-instruments-how-they-work-how-they-are-planned-built-and-testd/ END:VEVENT BEGIN:VEVENT UID:20220815T1213Z-1660565611.3408-EO-14097-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20220815T121243Z LAST-MODIFIED:20220818T134352Z DTSTART;TZID=Europe/Berlin:20221005T103000 DTEND;TZID=Europe/Berlin:20221005T123000 SUMMARY: Career Event: Dr. Maria Langbecker (TNG Consulting): The agile PhD DESCRIPTION: Have you ever struggled with giving structure to your PhD proj ect? Are you sometimes overwhelmed by too many things which all need to be done at once? Do you on occasion wonder where your day has gone because the “small task” you started in the morning took up the whole day? Do you feel there could […] X-ALT-DESC;FMTTYPE=text/html: 
    Have you ever struggled with giving stru
 cture to your PhD project? Are you sometimes overwhelmed by too many things
  which all need to be done at once? Do you on occasion wonder where your da
 y has gone because the “small task” you started in the morning took up the 
 whole day? Do you feel there could be a more efficient way to organize team
 work?At TNG\, we know that we all had these questions during our PhDs. Shor
 tly after starting to work in agile software development\, each of us had a
  couple of moments thinking “oh\, if I just would have known this (earlier)
  during my PhD!”. Therefore\, we would like to present ideas how agile meth
 odology commonly used in IT projects can be adapted to scientific work and 
 show some examples of how “agile” would have helped us in hindsight or even
  did help us finishing our PhDs more efficiently.
    CATEGORIES:Career event ORGANIZER;CN="rmauersberger":MAILTO:rmauersberger@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/career-even t-dr-maria-langbecker-tng-consulting-the-agile-phd/ END:VEVENT BEGIN:VEVENT UID:20220609T2127Z-1654810061.4088-EO-14026-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20220608T140853Z LAST-MODIFIED:20220608T140918Z DTSTART;VALUE=DATE:20221019 DTEND;VALUE=DATE:20221023 SUMMARY: IMPRS Retreat to Cochem DESCRIPTION: Science and social interaction will be the focus of the IMPRS retreat to Cochem (Mosella). X-ALT-DESC;FMTTYPE=text/html:

    Science and social interaction will be the focus of the IMPRS retreat to Cochem (Mosella).

    CATEGORIES:Retreat ORGANIZER;CN="rmauersberger":MAILTO:rmauersberger@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/imprs-retre at-to-cochem/ END:VEVENT BEGIN:VEVENT UID:20220815T1213Z-1660565611.3496-EO-14094-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20220815T113051Z LAST-MODIFIED:20220818T134213Z DTSTART;VALUE=DATE:20221119 DTEND;VALUE=DATE:20221125 SUMMARY: Common workshop with the MPI for Gravitational Physics DESCRIPTION: This year we will try a new format: Students from our IMPRS  f or A&\;A will meet with Ph.D. students from the MPI for Gravitational P hysics (Hannover). We will meet for 6 days in a  hotel Oberwinter near Rema gen and listen to high-caliber lectures on astrophysical and instrumental a spects of gravity. X-ALT-DESC;FMTTYPE=text/html:

    This year we will try a new format: Studen ts from our IMPRS  for A&A will meet with Ph.D. students from the MPI for G ravitational Physics (Hannover). We will meet for 6 days in a  hotel Oberwi nter near Remagen and listen to high-caliber lectures on astrophysical and instrumental aspects of gravity.

    CATEGORIES:Retreat ORGANIZER;CN="rmauersberger":MAILTO:rmauersberger@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/common-work shop-with-the-mpi-for-gravitational-physics/ END:VEVENT BEGIN:VEVENT UID:20230124T1813Z-1674584015.8941-EO-13813-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20230123T170149Z LAST-MODIFIED:20230126T103847Z DTSTART;TZID=Europe/Berlin:20230126T130000 DTEND;TZID=Europe/Berlin:20230126T163000 SUMMARY: IMPRS Conference in hybrid format DESCRIPTION: Abstracts to the talks can be found here: https://events.mpifr -bonn.mpg.de/indico/event/318/ If you plan to join in person\, we kindly as k you to register on the same page. The conference takes place in room 0.02 at the MPIfR. The program is as follows: 13:00 – 13:35 Iason-Michail Skret as – A detailed kinematic analysis of the DR21 Main outflow […] X-ALT-DESC;FMTTYPE=text/html:

    Abstracts to the talks can be found here: https://events.mpifr-bonn.mpg.de/indico/event/318/
    If you plan to join in person\, we kindly ask you to register on the same page.

    The conference takes place in room 0.02 at the MPIfR.

    The program is as follows:

    13:00 - 13:35 Iason-Michail Skretas - A detai led kinematic analysis of the DR21 Main outflow
    13:35 - 14:10 Sarwar K han - Galactic HII regions in the GLOSTAR Survey
    14:10 - 14:45 Ankur D ev - Data stream simulations for Line Intensity Mapping with FYST
    14:4 5 - 15:05 Break
    15:05 - 15:40 Jaswanth Subramanyam - Studying magnetic fields in distant galaxies
    15:40 - 16:15 Hendrik Müller - Advanced VL BI Imaging

    CATEGORIES:IMPRS ORGANIZER;CN="pott":MAILTO:pott@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/imprs-confe rence-in-hybrid-format/ END:VEVENT BEGIN:VEVENT UID:20230111T0621Z-1673418116.5471-EO-14246-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20230110T115356Z LAST-MODIFIED:20230227T144900Z DTSTART;TZID=Europe/Berlin:20230228T083000 DTEND;TZID=Europe/Berlin:20230302T160000 SUMMARY: IMPRS Black Board Lecture: Practical Time Series Analysis DESCRIPTION: The lecture consists of six parts\, which take place on three consecutive days. Venue: At MPIfR (Auditorium 0.02) Detailed information ab out all parts of the workshop: https://events.mpifr-bonn.mpg.de/indico/cate gory/23/ Application on this page: https://events.mpifr-bonn.mpg.de/indico/ event/300/   X-ALT-DESC;FMTTYPE=text/html:

    The lecture consists of six parts\, which take place on three consecutive days.

    Venue: At MPIfR (Auditorium 0.02)

    Detailed information about all parts of the workshop: https://events.mpifr- bonn.mpg.de/indico/category/23/

    Application on this page: https://events.mpifr-bonn.mpg.de/indico/event/300/

     

    CATEGORIES:Blackboard ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/imprs-black -board-lecture-practical-time-series-analysis-16/ END:VEVENT BEGIN:VEVENT UID:20230318T0452Z-1679115124.1766-EO-14305-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20230315T165801Z LAST-MODIFIED:20230317T110138Z DTSTART;TZID=Europe/Berlin:20230324T110000 DTEND;TZID=Europe/Berlin:20230324T123000 SUMMARY: MPIfR/AIfA Main Colloquium\, Speaker: Dr. Ronald Drimmel DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium Titel: Mapping the Milky Way: Galactic cartog raphy in the age of high precision parallaxes Speaker: Dr. Ronald Drimmel\, Osservatorio astrofisico di Torino\, INAF (Italy) Galactic studies is unde rgoing a renaissance in the current decade\, thanks not only to Gaia\, but to ground-breaking astrometry in the […] X-ALT-DESC;FMTTYPE=text/html:

    Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium

    Ti tel: Mapping the Milky Way: Galactic cartography in the age of high precisi on parallaxes

    Speaker: Dr. Ronald Drimmel\, Osservatorio astrofisico di Torino\, INAF (Italy)

    Galactic studies is undergoing a renaissance in the current decade\, thanks not only to Gaia\, but to ground-breaking a strometry in the NIR and radio. I will give an update on the latest Gaia re sults following on the it's last data release about the structure of our Ga laxy\, with particular focus on the disk. Thanks to a recent Lorentz Center workshop with the same title as this talk\, I will attempt to put Gaia's c ontribution in the context of other recent results from the NIR and radio. Integrating all these together I hope to share what we are learning and hop e to soon learn about the Milky Way.

    CATEGORIES:Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/main-colloq uium-mapping-the-milky-way-galactic-cartography-in-the-age-of-high-precisio n-parallaxes/ END:VEVENT BEGIN:VEVENT UID:20230301T1251Z-1677675077.8619-EO-14288-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20230227T143300Z LAST-MODIFIED:20230227T143300Z DTSTART;TZID=Europe/Berlin:20230326T120000 DTEND;TZID=Europe/Berlin:20230331T160000 SUMMARY: Gravity: Common Lecture Week by the MPIs for Gravitational Physics and Radio Astronomy DESCRIPTION: Lectures and interactive work on different aspects of gravity. More information: https://events.mpifr-bonn.mpg.de/indico/event/323/ Venue : Fintel Strandhotel https://www.eurostrand.de/resorts/lueneburger-heide/     X-ALT-DESC;FMTTYPE=text/html:

    Lectures and interactive work on different aspects of gravity.

    More information: ht tps://events.mpifr-bonn.mpg.de/indico/event/323/

    Venue: Fintel St randhotel https://www.eurostrand.de/resorts/l ueneburger-heide/

     

     

    CATEGORIES:Retreat ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/gravity-com mon-lecture-week-by-the-mpis-for-gravitational-physics-and-radio-astronomy/ END:VEVENT BEGIN:VEVENT UID:20230323T1125Z-1679570731.1312-EO-14308-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20230320T112236Z LAST-MODIFIED:20230320T112236Z DTSTART;TZID=Europe/Berlin:20230331T130000 DTEND;TZID=Europe/Berlin:20230331T163500 SUMMARY: 16th IMPRS conference DESCRIPTION: The 16th IMPRS conference will be held on Friday\, 31st of Mar ch 2023\, from 13:00 to 16:35 CEST in a hybrid format. The program\, the ab stracts to the talks\, venue and more information here:  https://events.mpi fr-bonn.mpg.de/indico/event/326/ X-ALT-DESC;FMTTYPE=text/html:

    The 16th IMPRS conference will be held on Friday\, 31st of March 2023\, from 13:00 to 16:35 CEST in a hybrid format.< /p>

    The program\, the abstracts to the talks\, venue and more information here:  https://events.mpifr-bonn.mpg.de/indico /event/326/

    CATEGORIES:IMPRS ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/16th-imprs- conference/ END:VEVENT BEGIN:VEVENT UID:20230412T1948Z-1681328929.6686-EO-14321-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20230412T093634Z LAST-MODIFIED:20230412T093634Z DTSTART;TZID=Europe/Berlin:20230418T110000 DTEND;TZID=Europe/Berlin:20230418T120000 SUMMARY: PhD colloquium: Hans Nguyen DESCRIPTION: PhD colloquium\, location: Auditorium 0.02\, MPIfR Hans Nguyen GLOSTAR: Investigating Tracers of Early High-Mass Star Formation High-mass stars (>8 msol) are not as numerous as their less massive counterparts but have a much more profound impact on their environment within their native galaxies. Despite their importance\, our understanding of their formation p rocess is not as developed […] X-ALT-DESC;FMTTYPE=text/html:

    PhD colloquium\, location: Auditorium 0.02 \, MPIfR

    Hans Nguyen

    GLOSTAR: Investigating Tracers of Early High-Mass Star Formation

    High-mass stars (>8 msol) are not as numerous as their less massive counterparts but have a much more pr ofound impact on their environment within their native galaxies. Despite th eir importance\, our understanding of their formation process is not as dev eloped as that of low-mass stars. As such\, the GLObal view on STAR formati on (GLOSTAR) Galactic Plane survey aims to address this question of how hig h-mass stars form by finding all sites of high-mass star formation at diffe rent evolutionary stages in the Milky Way and characterising their physical properties in order to develop a complete view of massive star formation. In the first half of this talk\, I present our findings of 5.8 GHz radio co ntinuum observations of the region known as the Central Molecular Zone (CMZ ) using the Karl G. Jansky Very Large Array (VLA) to detect HII regions\, w hich are known tracers of high-mass star formation. We investigated the pre sence of young stellar object (YSO) candidates with HII regions as it is un known how many of the near-infrared (NIR) identified YSOs trace HII regions . Our results show that the majority of these NIR-identified YSOs lack VLA radio counterparts. We found that most of these sources also lack dust emis sion (using data from ATLASGAL)\, and it is likely that they are older and have dispersed their natal clouds. The second half of this talk focuses on 6.7 GHz methanol masers as they have been shown to be an exclusive tracer o f the earliest stages of high-mass star formation. Many surveys have alread y been conducted\, however\, with the upgraded VLA\, GLOSTAR can provide th e most sensitive unbiased survey of 6.7 GHz methanol masers to date. I pres ent the results of this catalogue where we detect many new masers. To study the environments of early high-mass star formation we used ancillary dust continuum and radio continuum data. We find that the newly detected masers are more likely to be associated with less massive stars. Furthermore\, by comparing the radio source and the maser flux distributions\, we find no co rrelation with respect to angular offset\, suggesting that the maser and th e radio source are powered by unrelated mechanisms.

    CATEGORIES:Thesis Defense ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/phd-colloqu ium-hans-nguyen/ END:VEVENT BEGIN:VEVENT UID:20230329T1156Z-1680091019.7161-EO-14314-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20230328T134125Z LAST-MODIFIED:20230412T100212Z DTSTART;TZID=Europe/Berlin:20230421T110000 DTEND;TZID=Europe/Berlin:20230421T123000 SUMMARY: MPIfR/AIfA Main Colloquium\, Speaker: Prof. Alessandra Corsi DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium\, location: Online Video Conference Titel: Mu lti-messenger observations of cosmic collisions: progenitors\, relativistic ejecta\, and remnants Speaker: Prof. Alessandra Corsi\, Texas Tech Univers ity\, Lubbock\, USA The births and mergers of neutron stars and black holes \, the most exotic objects in the universe\, can launch the fastest […] X-ALT-DESC;FMTTYPE=text/html:

    Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium\, location: Onlin e Video Conference

    Titel: Multi-messenger observations of cosmic collisions: progenitors\, relativistic ejecta\, and remnants

    Speaker: Prof. Alessandra Corsi\, Texas Tech University\, Lubbock\, USA< /p>

    The births and mergers of neutron stars and black holes\, the most ex otic objects in the universe\, can launch the fastest cosmic jets and shake the very fabric of space-time with gravitational waves. GW170817\, the mer ger of two neutron stars witnessed through both its gravitational wave sire n and its glow at all wavelengths of light\, marked the beginning of a gold en age in multi-messenger astrophysics. Starting from the example of GW1708 17\, I will show how observations at radio wavelengths can probe the ejecta and environments of compact binary mergers and help unveil their progenito rs and remnants. I will then discuss opportunities and challenges ahead\, a s new observational facilities will transform a trickle of multi-messenger discoveries into a flood. I will conclude by highlighting prospects for ext ending the reach of radio and gravitational wave studies to the heaviest bl ack holes in merging galaxies.

    CATEGORIES:Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mpifraifa-m ain-colloquium-speaker-prof-alessandra-corsi/ END:VEVENT BEGIN:VEVENT UID:20230412T1948Z-1681328929.6493-EO-14320-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20230412T092826Z LAST-MODIFIED:20230419T081158Z DTSTART;TZID=Europe/Berlin:20230426T140000 DTEND;TZID=Europe/Berlin:20230426T153000 SUMMARY: PhD colloquium: Stefano Ebagezio DESCRIPTION: PhD colloquium\, location: Seminar Room\, I. Physics\, Cologne Stefano Ebagezio Molecular clouds and stellar feedback: an investigation o f synthetic line and continuum emission maps X-ALT-DESC;FMTTYPE=text/html:

    PhD colloquium\, location: Seminar Room\, I. Physics\, Cologne

    Stefano Ebagezio

    Molecular clouds and stellar feedback: an investigation of synthetic line and continuum emis sion maps

    CATEGORIES:Thesis Defense ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/phd-colloqu ium-huanchen-hu/ END:VEVENT BEGIN:VEVENT UID:20230423T2221Z-1682288479.7198-EO-14324-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20230419T094112Z LAST-MODIFIED:20230419T094112Z DTSTART;TZID=Europe/Berlin:20230505T110000 DTEND;TZID=Europe/Berlin:20230505T120000 SUMMARY: MPIfR/AIfA Main Colloquium\, Speaker: Prof. Guido Müller DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium Titel: The Laser Interferometer Space Antenna (LISA) Speaker: Prof. Guido Müller\, Max Planck Institute for Gravitationa l Physics (Hannover) Since their first detection\, gravitational waves (GW) have become a major part of current and future plans to study the universe . The current ground based observatories opened […] X-ALT-DESC;FMTTYPE=text/html:

    Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium

    Ti tel: The Laser Interferometer Space Antenna (LISA)

    Speaker: Prof. Gui do Müller\, Max Planck Institute for Gravitational Physics (Hannover)

    Since their first detection\, gravitational waves (GW) have become a major part of current and future plans to study the universe. The current ground based observatories opened an observational channel which allows us to lis ten to GW from mergers between neutron stars and black holes up to about 10 0 solar masses. The first space-based observatory\, the Laser Interferomete r Space Antenna (LISA)\, will enable us to listen to the mHz gravitational wave band which is the natural frequency of GW sources involving a million solar mass black holes. LISA is currently passing through the first project phases and is expected to be adopted by ESA as its next L-class mission la ter this year with a launch anticipated in the mid 2030s. I will discuss th e science case for LISA as well as its technology and also initial ideas ab out ‘beyond LISA’ missions.

    CATEGORIES:Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mpifraifa-m ain-colloquium-speaker-prof-guido-muller/ END:VEVENT BEGIN:VEVENT UID:20230325T1425Z-1679754315.479-EO-14313-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20230324T115503Z LAST-MODIFIED:20230324T115503Z DTSTART;TZID=Europe/Berlin:20230526T110000 DTEND;TZID=Europe/Berlin:20230526T123000 SUMMARY: MPIfR/AIfA Main Colloquium\, Speaker: Dr. Rainer Schödel DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium Titel: The nuclear stellar disc of the Milky Way Speaker: Dr. Rainer Schödel\, Instituto de Astrofísica de Andalucía – C SIC\, Granada\, Spain The Galactic Centre region is dominated by the nuclea r stellar disc (NSD)\, a rotating structure with a radius of ~200 pc that i s […] X-ALT-DESC;FMTTYPE=text/html:

    Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium

    Ti tel: The nuclear stellar disc of the Milky Way

    Speaker: Dr. Rainer Sc hödel\, Instituto de Astrofísica de Andalucía - CSIC\, Granada\, Spain

    < p>The Galactic Centre region is dominated by the nuclear stellar disc (NSD) \, a rotating structure with a radius of ~200 pc that is kinematically and chemically different from the surrounding bulge. The NSD overlaps with the central molecular zone (CMZ)\, where ~10% of the Galaxy’s molecular gas is concentrated. The extreme conditions in the NSD and CMZ closely match those in high-redshift star forming regions. I will summarise our current knowle dge about the NSD\, obtained mostly through high angular resolution near-in frared studies\, and how the NSD relates to the larger structure of the Mil ky Way. I will describe how my group are currently working on obtaining pro per motions for millions of stars in the NSD\, a region inaccessible to Gai a\, and how we use the new data to better understand structure\, formation history and recent star formation in the NSD.

    CATEGORIES:Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mpifraifa-m ain-colloquium-speaker-dr-rainer-schodel/ END:VEVENT BEGIN:VEVENT UID:20230529T1618Z-1685377128.2409-EO-14330-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20230525T100303Z LAST-MODIFIED:20230525T100342Z DTSTART;TZID=Europe/Berlin:20230601T130000 DTEND;TZID=Europe/Berlin:20230601T170000 SUMMARY: 17th IMPRS conference DESCRIPTION: The 17th IMPRS conference will be held on Thursday\, 1st of Ju ne 2023\, from 13:00 to 17:00 CEST in a hybrid format. The program\, the ab stracts to the talks\, venue and more information here: https://events.mpif r-bonn.mpg.de/indico/event/326/ X-ALT-DESC;FMTTYPE=text/html:

    The 17th IMPRS conference will be held on Thursday\, 1st of June 2023\, from 13:00 to 17:00 CEST in a hybrid format.< /p>

    The program\, the abstracts to the talks\, venue and more information here: https://events.mpifr-bonn.mpg.de/indico/ event/326/

    CATEGORIES:IMPRS ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/17th-imprs- conference/ END:VEVENT BEGIN:VEVENT UID:20230517T0336Z-1684294585.6592-EO-14327-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20230516T101529Z LAST-MODIFIED:20230516T101529Z DTSTART;TZID=Europe/Berlin:20230602T110000 DTEND;TZID=Europe/Berlin:20230602T123000 SUMMARY: MPIfR/AIfA Main Colloquium\, Speaker: Prof. Zakaria Meliani DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium Titel: Exploring the Impact of Intrinsic Prop erties on Shocks and Variabilities in Relativistic Jets Speaker: Prof. Zaka ria Meliani\, Observatoire de Paris Relativistic jets in radio-loud active galactic nuclei (AGN) are fascinating astrophysical phenomena that emit non -thermal radiation across the electromagnetic spectrum and display diverse characteristics […] X-ALT-DESC;FMTTYPE=text/html:

    Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium

    Ti tel: Exploring the Impact of Intrinsic Properties on Shocks and Variabiliti es in Relativistic Jets

    Speaker: Prof. Zakaria Meliani\, Observatoire de Paris

    Relativistic jets in radio-loud active galactic nuclei (AGN ) are fascinating astrophysical phenomena that emit non-thermal radiation a cross the electromagnetic spectrum and display diverse characteristics at d ifferent scales. With their frequent high flux variability\, they are ideal objects to study high-energy physical processes. In this presentation\, we conduct a comprehensive investigation of the intrinsic properties of relat ivistic jets and their impact on dynamics\, interaction with the external m edium\, and resulting observed light curve.To explore the properties of rel ativistic jets\, we employ a combination of relativistic magneto-hydrodynam ic (MHD) simulations using the MPI-AMRVAC code and radiative transfer simul ations with the post-processing code REPTIDE. We focus on the impact of var ious intrinsic properties of the jet\, such as magnetization\, rotation pro file\, and transverse structure and variability\, on the formation\, evolut ion\, and behavior of standing knots and their interaction with moving knot s. We also examine the observables associated with these features and their connection to observed variabilities at different wavelengths.

    CATEGORIES:Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mpifraifa-m ain-colloquium-speaker-prof-zakaria-meliani/ END:VEVENT BEGIN:VEVENT UID:20230603T1935Z-1685820900.6957-EO-14334-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20230530T154151Z LAST-MODIFIED:20230530T154151Z DTSTART;TZID=Europe/Berlin:20230616T110000 DTEND;TZID=Europe/Berlin:20230616T123000 SUMMARY: MPIfR/AIfA Main Colloquium\, Speaker: Dr. Stanislav Babak DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium Titel: Astrophysics and fundamental physics w ith LISA observations Speaker: Dr. Stanislav Babak\, APC\, Paris The sky is bright in gravitational waves in the milli-Hz band. We expect emission fro m millions of inspiralling white dwarf binaries in our Galaxy\, merging mas sive black holes\, stellar-mass black holes […] X-ALT-DESC;FMTTYPE=text/html:

    Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium

    Ti tel: Astrophysics and fundamental physics with LISA observations

    Spea ker: Dr. Stanislav Babak\, APC\, Paris

    The sky is bright in gravitati onal waves in the milli-Hz band. We expect emission from millions of inspir alling white dwarf binaries in our Galaxy\, merging massive black holes\, s tellar-mass black holes plunging into massive holes\, stochastic gravitatio nal wave signal and more. LISA is L3 ESA-led mission aiming at detecting al l these sources. These observations will allow us to infer the channel of f ormation and evolution of massive (and not very massive) black holes\, esti mate the Universe's expansion rate and constrain (or observe) the deviation s from General Relativity. I will review the rich science achievable with L ISA.

    CATEGORIES:Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mpifraifa-m ain-colloquium-speaker-dr-stanislav-babak/ END:VEVENT BEGIN:VEVENT UID:20230522T1833Z-1684780428.5587-EO-14329-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20230522T092459Z LAST-MODIFIED:20230522T092459Z DTSTART;TZID=Europe/Berlin:20230623T110000 DTEND;TZID=Europe/Berlin:20230623T123000 SUMMARY: MPIfR/AIfA Main Colloquium\, Speaker: Dr. Viktor Toth DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium. Title: Past\, present and future of Hungaria n radio astronomy Speaker: Dr. Viktor Toth\, Eötvös University\, Budapest D rawing the history of Hungarian radio astronomy\, one may in principal star t with the successful Moon radar measurements in 1946\, but at least with t he HI 21cm measurements of […] X-ALT-DESC;FMTTYPE=text/html:

    Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium.

    T itle: Past\, present and future of Hungarian radio astronomy

    Speaker: Dr. Viktor Toth\, Eötvös University\, Budapest

    Drawing the history o f Hungarian radio astronomy\, one may in principal start with the successfu l Moon radar measurements in 1946\, but at least with the HI 21cm measureme nts of the 1960s. Hungarian astronomers\, lately even our MSc students\, be came users of world class facilities\, carried out single-dish and interfer ometric measurements with ground based and space born observatories. I will sample those results in the prelude of my talk with special focus on a few topics where also the Effelsberg-100m radio telescope was used. Last decad es saw a few attempts to build Hungarian radio astronomical facilities agai n after the mid 20s century. We conducted site tests\, considered possible scientific goals and appropriate specifications to work out a concept in th e last 5 years. I will give a short review of our recent activities towards establishing the first Hungarian radio astronomical observatory.

    CATEGORIES:Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mpifraifa-m ain-colloquium-speaker-dr-viktor-toth/ END:VEVENT BEGIN:VEVENT UID:20230614T1933Z-1686771234.4179-EO-14348-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20230614T100653Z LAST-MODIFIED:20230614T113137Z DTSTART;TZID=Europe/Berlin:20230623T110000 DTEND;TZID=Europe/Berlin:20230623T120000 SUMMARY: University of Cologne\, Ph1\, Friday science seminar\, Speaker: Ma sato Kobayashi DESCRIPTION: University of Cologne\, Ph1\, Bi-weekly Friday science seminar Speaker: Masato Kobayashi (University of Cologne\, Ph1) Title: Critical me tallicity in molecular cloud formation? Abstract: The formation of molecula r clouds out of HI gas is the first step toward star formation. Its metalli city dependence plays a key role to determine star formation through the co smic history. Recent theories and observational studies indicate […] X-ALT-DESC;FMTTYPE=text/html:
    University of Cologne\, Ph1\, Bi-weekly Friday science seminar
    < div class="">Speaker: Masato Kobayashi (Univ ersity of Cologne\, Ph1)
    Title: Critical metallicity in molecular clou d formation?
    Abstr act:
    The formation of molecular clouds out of HI gas is the first step toward star formation. Its metallicity dependence plays a ke y role to determine star formation through the cosmic history. Recent theor ies and observational studies indicate that supersonic shocks in the ISM se em to play an important role to drive molecular cloud formation and evoluti on.
    We performed magnetohydrodynamics simulations of 20 km s^−1 converging flows of Warm Neutral Medium (WNM) with 1 uG mean magnet ic field. We investigated the metallicity range from the Solar (1.0 Zsun) t o 0.2 Zsun environment and also changed the magnetic field angle against th e converging flow direction. Our results show that Cold Neutral Medium (CNM ) formation is significantly suppressed in lower metallicity environments d ue to the post-shock shear flows\, which prevents the thermal instability g rowth. This suggests that successful molecular cloud formation in lower-met allicity environments is limited to the regions where the mean magnetic fie lds are closely parallel to the direction of the supersonic shock propagati on and/or shock speed is high enough to accumulate mass that becomes self-g ravitationally unstable resulting in active star formation. This transition in cloud formation may happen typically at ~ 0.2 Zsun.
    This is consistent with recent ALMA observations toward the Magellanic Clou ds and high-redshift galaxies and should be further tested with observation s in the Milky Way as well\, such as the FEEDBACK project in SOFIA.
    CATEGORIES:Cologne ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/university- of-cologne-ph1-friday-science-seminar-speaker-masato-kobayashi/ END:VEVENT BEGIN:VEVENT UID:20230323T1125Z-1679570731.1393-EO-14310-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20230321T133046Z LAST-MODIFIED:20240613T131541Z DTSTART;TZID=Europe/Berlin:20230703T100000 DTEND;TZID=Europe/Berlin:20230707T140000 SUMMARY: Black Board Lectures by Prof. Anvar Shukorov DESCRIPTION: Titel: Turbulence and dynamos for astrophysicists by Prof. Anv ar Shukurov (School of Mathematics\, Statistics and Physics\, Newcastle Uni versity\, U.K.) Monday\, 3 July 2023 to Friday\, 7 July 2023 at Max Planck Institute for Radio Astronomy (Auditorium 0.02) For details visit https://e vents.mpifr-bonn.mpg.de/indico/event/328/ X-ALT-DESC;FMTTYPE=text/html:

    Titel: Turbulence and dynamos for astrophysicists
    by Prof. Anvar Shukurov (Sch ool of Mathematics\, Statistics and Physics\, Newcastle University\, U.K.)< br />Monday\, 3 July 2023 to Friday\, 7 July 2023
    at Max Planck Instit ute for Radio Astronomy (Auditorium 0.02)

    For details visit https://events.mpifr-bonn.mpg.de/indico/event/328/ CATEGORIES:Blackboard ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/black-board -lecture-by-prof-anvar-shukorov/ END:VEVENT BEGIN:VEVENT UID:20230627T0158Z-1687831130.3396-EO-14355-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20230626T111733Z LAST-MODIFIED:20230626T111733Z DTSTART;TZID=Europe/Berlin:20230703T123000 DTEND;TZID=Europe/Berlin:20230703T140000 SUMMARY: PhD colloquium: Rohit Dokara DESCRIPTION: PhD colloquium\, location: Auditorium 0.02\, MPIfR Rohit Dokar a Searching for the Ashes of Dead Stars A supernova event marks the death o f either a high-mass (>8 Msol) star\, or a white dwarf in a binary system. Such an event expels most of the stellar interiors into the surrounding int erstellar medium and forms a supernova remnant (SNR). […] X-ALT-DESC;FMTTYPE=text/html:

    PhD colloquium\, location: Auditorium 0.02 \, MPIfR

    Rohit Dokara

    Searching for the Ashes of Dead Stars

    A supernova event marks the dea th of either a high-mass (>8 Msol) star\, or a white dwarf in a binary syst em. Such an event expels most of the stellar interiors into the surrounding interstellar medium and forms a supernova remnant (SNR). The global effect s of SNRs on their native galaxies (e.g.\, creating/destroying dust\, suppr essing/accelerating star-formation activity) are poorly understood\, and a complete sample of the SNRs in our own Galaxy is necessary to obtain key ob servational constraints in this regard. However\, only about 300 SNRs are c atalogued in the Milky Way so far\, while the expected number is of the ord er of 1000 or more. In this talk\, I will describe our attempts to rectify this apparent deficiency by finding new SNRs. We identified 157 SNR candida tes in the images of the 4-8 GHz GLObal view on STAR formation (GLOSTAR) su rvey\, which utilizes the Jansky Very Large Array and the 100-meter Effelsb erg radio telescopes. By measuring polarization and spectral indices\, we e stablished the nonthermal nature of the radio emission from at least seven SNR candidates\, providing evidence that they are indeed SNRs. In addition\ , we also found spurious entries in the catalog of Milky Way's SNRs. We per formed a Monte-Carlo simulation of supernova events and the subsequent evol ution of their remnants\, which suggested that the biggest gains in the que sts to find new SNRs can be made by searching for small angular-size SNRs t hat are only a few arcminutes wide.

     

    CATEGORIES:Thesis Defense ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/phd-colloqu ium-rohit-dokara/ END:VEVENT BEGIN:VEVENT UID:20230705T2231Z-1688596308.8277-EO-14359-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20230704T150150Z LAST-MODIFIED:20230704T150332Z DTSTART;TZID=Europe/Berlin:20230718T120000 DTEND;TZID=Europe/Berlin:20230718T140000 SUMMARY: PhD colloquium: Hendrik Müller DESCRIPTION: PhD colloquium\, location: Seminar room\, I. Physikalisches In stitut\, University of Cologne Hendrik Müller Advanced VLBI Imaging Very Lo ng Baseline Interferometry (VLBI) is an observational technique developed i n astronomy for combining multiple radio telescopes into a single virtual i nstrument with an effective aperture reaching up to many thousand kilometer s and enabling measurements at highest angular resolutions. Despite […] X-ALT-DESC;FMTTYPE=text/html:

    PhD colloquium\, location: Seminar room\, I. Physikalisches Institut\, University of Cologne

    Hendrik Müller

    Advanced VLBI Imaging

    Very Long Baseline Interfer ometry (VLBI) is an observational technique developed in astronomy for comb ining multiple radio telescopes into a single virtual instrument with an ef fective aperture reaching up to many thousand kilometers and enabling measu rements at highest angular resolutions. Despite the proven successes of VLB I\, analysis and imaging of VLBI data still remain difficult\, owing in par t to the fact that VLBI imaging inherently constitutes an ill-posed inverse problem. Historically\, this problem has been addressed in radio interfero metry by the CLEAN algorithm\, a matchingpursuit inverse modeling method de veloped in the early 1970-s and since then established as a de-facto standa rd approach for imaging VLBI data. In recent years\, the constantly increas ing demand for improving quality and fidelity of interferometric image reco nstruction has resulted in several attempts to employ new approaches\, such as forward modeling and Bayesian estimation\, for application to VLBI imag ing. While the current state-of-the-art forward modeling and Bayesian techn iques may outperform CLEAN in terms of accuracy\, resolution\, robustness\, and adaptability\, they also tend to require more complex structure and lo nger computation times\, and rely on extensive finetuning of a larger numbe r of non-trivial hyperparameters. This leaves an ample room for further sea rches for potentially more effective imaging approaches and provides the ma in motivation for this dissertation and its particular focusing on the need to unify algorithmic frameworks and to study VLBI imaging from the perspec tive of inverse problems in general. In pursuit of this goal\, and based on an extensive qualitative comparison of the existing methods\, this dissert ation comprises the development\, testing\, and first implementations of tw o novel concepts for improved interferometric image reconstruction. The con cepts combine the known benefits of current forward modeling techniques\, d evelop more automatic and less supervised algorithms for image reconstructi on\, and realize them within two different frameworks.

    CATEGORIES:Thesis Defense ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/phd-colloqu ium-hendrik-muller/ END:VEVENT BEGIN:VEVENT UID:20230718T1718Z-1689700721.3433-EO-14365-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20230718T091640Z LAST-MODIFIED:20230718T091640Z DTSTART;TZID=Europe/Berlin:20230720T140000 DTEND;TZID=Europe/Berlin:20230720T160000 SUMMARY: PhD colloquium: Elaheh Hosseini DESCRIPTION: PhD colloquium\, location: Seminar room\, I. Physikalisches In stitut\, University of Cologne Elaheh Hosseini On the ambient medium and a dense stellar association around the supermassive black hole\, Sgr A*   X-ALT-DESC;FMTTYPE=text/html:

    PhD colloquium\, location: Seminar room\, I. Physikalisches Institut\, University of Cologne

    Elaheh Hosseini

    On the ambient medium and a dense stellar association around th e supermassive black hole\, Sgr A*

     

    CATEGORIES:Thesis Defense ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/phd-colloqu ium-elaheh-hosseini/ END:VEVENT BEGIN:VEVENT UID:20230818T0203Z-1692324229.1547-EO-14386-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20230815T101727Z LAST-MODIFIED:20230815T102022Z DTSTART;TZID=Europe/Berlin:20230913T150000 DTEND;TZID=Europe/Berlin:20230913T180000 SUMMARY: IMPRS Training: Presentation Skills DESCRIPTION: by PD Dr. Rainer Mauersberger Introduction and five follow-up dates. Schedule\, always 3-6pm: 5. Oktober 12. Oktober 26. Oktober 2. Novem ber 9. November X-ALT-DESC;FMTTYPE=text/html:

    by PD Dr. Rainer Mauersberger

    Introd uction and five follow-up dates.

    Schedule\,
    always 3-6pm:
    5 . Oktober
    12. Oktober
    26. Oktober
    2. November
    9. Novemb er

    CATEGORIES:Softskills ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/imprs-train ing-presentation-skills/ END:VEVENT BEGIN:VEVENT UID:20230818T0203Z-1692324229.1923-EO-14388-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20230815T165901Z LAST-MODIFIED:20230815T165901Z DTSTART;VALUE=DATE:20230915 DTEND;VALUE=DATE:20230919 SUMMARY: IMPRS Retreat Oostende DESCRIPTION: Scientific Retreat Oostende\, Belgium. X-ALT-DESC;FMTTYPE=text/html:

    Scientific Retreat Oostende\, Belgium.

    CATEGORIES:Retreat ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/imprs-retre at-oostende/ END:VEVENT BEGIN:VEVENT UID:20230906T1552Z-1694015553.8877-EO-14418-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20230906T133906Z LAST-MODIFIED:20230906T133906Z DTSTART;TZID=Europe/Berlin:20230920T110000 DTEND;TZID=Europe/Berlin:20230920T130000 SUMMARY: PhD colloquium: Tim Sprenger DESCRIPTION: PhD colloquium\, location: Auditorium 0.02\, MPIfR Tim Sprenge r Pulsar Scintillation and Interstellar Lenses The study of scintillation a rcs is a quickly growing field aiming at understanding the small-scale stru cture of the interstellar medium (ISM). Scintillation is caused by interfer ence of scattered paths through the ISM. The resulting intensity variations contain information on the scattering structures\, which […] X-ALT-DESC;FMTTYPE=text/html:

    PhD colloquium\, location: Auditorium 0.02 \, MPIfR

    Tim Sprenger

    Pulsar Scintillation and Interste llar Lenses

    The study of scintillation arcs is a quickly gro wing field aiming at understanding the small-scale structure of the interst ellar medium (ISM). Scintillation is caused by interference of scattered pa ths through the ISM. The resulting intensity variations contain information on the scattering structures\, which manifests in scintillation arcs. I wo rked on a novel technique to extract this information with high resolution. The main object of study in my thesis is PSR B1508+55\, which showed pecul iar scintillation phenomena in the past. I will present observations made a t the Effelsberg 100-m telescope spanning from 2020 to 2023\, during which the pulsar goes through various phases of scintillation arcs with rich subs tructure. Many observables could be monitored over four years\, one of whic h was newly discovered in this study. The result is one of the most constra ining data sets of pulsar scintillation\, which clearly points to two scatt ering screens instead of one. I will show how such an extended model can ex plain the scintillation properties of PSR B1508+55.

    CATEGORIES:Thesis Defense ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/phd-colloqu ium-tim-sprenger/ END:VEVENT BEGIN:VEVENT UID:20230916T1809Z-1694887798.2405-EO-14453-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20230915T101752Z LAST-MODIFIED:20230915T101752Z DTSTART;TZID=Europe/Berlin:20230922T100000 DTEND;TZID=Europe/Berlin:20230922T123000 SUMMARY: PhD colloquium: Benedetta Spina DESCRIPTION: PhD colloquium\, location: Lecture Hall\, AIfA Benedetta Spina “Exploring the Epoch of Reionization with Line-Intensity Mapping” The epoc h of reionization (EoR) stands as a key phase in the history of the Univers e\, where the neutral elements that pervaded the cosmos gradually became io nized. This process was driven by the photons emitted by the the first lumi nous […] X-ALT-DESC;FMTTYPE=text/html:

    PhD colloquium\, location: Lecture Hall\, AIfA

    Benedetta Spina

    “Exploring the Epoch of Reionizati on with Line-Intensity Mapping”

    The epoch of reionizat ion (EoR) stands as a key phase in the history of the Universe\, where the neutral elements that pervaded the cosmos gradually became ionized. This pr ocess was driven by the photons emitted by the the first luminous sources\, therefore understanding the progression of the EoR means constraining the growth of structures and the interplay between galaxies and the intergalact ic medium. Considering up-coming radio surveys\, we make use of the line-in tensity mapping (LIM) technique which allows us to study the large-scale st ructure of the Universe through the detection of the hyperfine transition i n neutral hydrogen (HI) and single-ionized helium (HeII) atoms. Initially\, we focus on the connection between HI and dark-matter within haloes\, the HI-halo mass relation (HIHMR). We simulate mock HI intensity maps\, impleme nting systematic observational effects. We analyze the maps with the Minkow ski functionals and we explore the dependence of the HIHMR on halo and gala xy properties. The results demonstrate the potential of LIM experiments\, s uch as the SKA-1 MID\, to constrain the HIHMR. We proceed to study helium r eionization. We investigate the imprint of different reionization models (e arly and late scenarios) on the power spectrum of HeII mock intensity maps. We find that constraints on the timeline of the EoR can be achieved with t he radio surveys considered. At last\, we address the quenching of dwarf ga laxies by investigating the impact of the reionization front on their star- formation rates (SFRs). We assess the significance of galaxies' main charac teristics and we parametrize the probability of quenching. We provide a val uable tool to connect the observations with the theoretical framework. We h ave explored several sides of the EoR\, providing forecasts for next genera tion instruments. We have paid attention to consider both sides of the phen omenon we study\, observations and theory\, refining the theoretical models on reionization processes and guiding the interpretation of future observa tions.

    CATEGORIES:Thesis Defense ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/phd-colloqu ium-benedetta-spina/ END:VEVENT BEGIN:VEVENT UID:20230921T1436Z-1695306963.5149-EO-14455-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20230919T121324Z LAST-MODIFIED:20230919T121324Z DTSTART;TZID=Europe/Berlin:20230925T140000 DTEND;TZID=Europe/Berlin:20230925T160000 SUMMARY: PhD colloquium: Ben Hastings DESCRIPTION: PhD colloquium\, location: Lecture Hall 0.012\, AIfA Ben Hasti ngs The formation mechanisms of classical emission line stars Classical emi ssion line stars are fast rotators hosting a decretion disc in which the em ission lines form. Since their discovery in 1866\, the formation mechanism of these stars remains poorly understood. To explain their rapid rotation\, two channels are […] X-ALT-DESC;FMTTYPE=text/html:

    PhD colloquium\, location: Lecture Hall 0. 012\, AIfA

    Ben Hastings

    The formatio n mechanisms of classical emission line stars

    Classic al emission line stars are fast rotators hosting a decretion disc in which the emission lines form. Since their discovery in 1866\, the formation mech anism of these stars remains poorly understood. To explain their rapid rota tion\, two channels are proposed\; envelope spin-up due to the transport of angular momentum from their contracting core during hydrogen burning\, and accretion-induced spin-up during mass transfer in interacting binaries.

    The open cluster NGC 330\, which contains a rich population of classica l emission line stars is taken as a test case. To determine the dominant fo rmation channel\, we produce synthetic populations of exclusively single an d binary stars\, respectively. The synthetic population of single stars is generated from a grid of detailed numerical models of rotating stars. While the synthetic binary population is produced from a simple analytic model s o that uncertainties in binary evolution may be probed.

    One one hand\ , there is little evidence that the high initial rotation rates required to form emission line stars through the single star channel are realised in n ature. Therefore\, the large number of relatively unevolved emission line s tars in NGC 330 are unlikely to be explained by single star evolution.

    < p>On the other hand\, it is found that given specific\, albeit extreme assu mptions\, binary evolution can explain the observed population of emission line stars. One requirement is for mass-transfer to be non-conservative. Ho wever\, evidence for this is distinctly lacking\, with several post-mass tr ansfer systems suggesting rather conservative evolution.

    We conclude that likely\, both channels contribute to the production of emission line s tars\, and that the relative contributions are sensitive to the stellar bir th spin distribution and to the mass transfer efficiency in interacting bin ary systems.

    CATEGORIES:Thesis Defense ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/phd-colloqu ium-ben-hastings/ END:VEVENT BEGIN:VEVENT UID:20230925T1743Z-1695663820.8341-EO-14458-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20230925T134551Z LAST-MODIFIED:20230925T134551Z DTSTART;TZID=Europe/Berlin:20230929T110000 DTEND;TZID=Europe/Berlin:20230929T130000 SUMMARY: MPIfR/AIfA Main Colloquium\, Speaker: Prof. Dr. Kai Schmitz DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium Titel: New Physics at the Pulsar Timing Array Frontier Speaker: Prof. Dr. Kai Schmitz\, University of Muenster Pulsar Ti ming Array (PTA) collaborations around the globe recently announced compell ing evidence for a gravitational-wave background (GWB) at nanohertz frequen cies. This breakthrough achievement has important implications for astrophy sics\, […] X-ALT-DESC;FMTTYPE=text/html:

    Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium

    Ti tel: New Physics at the Pulsar Timing Array Frontier

    Speaker: Prof. D r. Kai Schmitz\, University of Muenster

    Pulsar Timing Array (PTA) col laborations around the globe recently announced compelling evidence for a g ravitational-wave background (GWB) at nanohertz frequencies. This breakthro ugh achievement has important implications for astrophysics\, as the GWB si gnal\, if genuine\, is likely to originate from a cosmic population of supe rmassive black holes orbiting each other at the centers of galaxies. As I w ill illustrate in this talk\, the new PTA data is\, however\, also of great interest to the high-energy physics community\, as it allows to probe a br oad range of particle physics models of the early Universe that predict the generation of a cosmological GWB in the Big Bang. In this sense\, the PTA data opens a new window onto the very early Universe and enables particle p hysicists to constrain scenarios of new physics beyond the Standard Model a t extremely high energies. In my talk\, I will give an overview of these se arches for new physics at the PTA frontier and highlight several cosmologic al scenarios that underline the relevance of PTA observations for fundament al problems such as dark matter\, neutrino masses\, and the matter-antimatt er asymmetry of the Universe. Finally\, I will conclude with a brief outloo k on future measurements that may help in discriminating between a GWB sign al of astrophysical origin and a GWB signal from the Big Bang.

    CATEGORIES:Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mpifraifa-m ain-colloquium-speaker-prof-dr-kai-schmitz/ END:VEVENT BEGIN:VEVENT UID:20230925T1743Z-1695663820.8429-EO-14459-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20230925T151952Z LAST-MODIFIED:20230925T151952Z DTSTART;TZID=Europe/Berlin:20231006T110000 DTEND;TZID=Europe/Berlin:20231006T130000 SUMMARY: MPIfR/AIfA Main Colloquium\, Speaker: Dr. Vikrant Jadhav DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium Titel: Binarity and dynamics of open clusters Speaker: Dr. Vikrant Jadhav\, AIfA Binary stars play a vital role in astro physical research\, as the majority of stars are in binaries. I will discus s the photometric identification of binaries in open clusters along with th eir cluster membership. […] X-ALT-DESC;FMTTYPE=text/html:

    Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium

    Ti tel: Binarity and dynamics of open clusters

    Speaker: Dr. Vikrant Jadh av\, AIfA

    Binary stars play a vital role in astrophysical research\, as the majority of stars are in binaries. I will discuss the photometric id entification of binaries in open clusters along with their cluster membersh ip. The binary fraction of open clusters ranges from 0.2 to 0.6 and it vari es with the mass of the primary stars. I will summarise a few studies focus ed on the evolution and detection of peculiar binary products such as blue stragglers and blue lurkers using Gaia and UVIT data. I plan to also presen t our ongoing work regarding the cluster dynamics\, specifically signatures of rotation and expansion in open clusters.

    CATEGORIES:Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mpifraifa-m ain-colloquium-speaker-dr-vikrant-jadhav/ END:VEVENT BEGIN:VEVENT UID:20231013T0605Z-1697177144.8751-EO-14460-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20231012T110317Z LAST-MODIFIED:20231012T110317Z DTSTART;TZID=Europe/Berlin:20231013T110000 DTEND;TZID=Europe/Berlin:20231013T123000 SUMMARY: MPIfR/AIfA Main Colloquium\, Speaker: Prof. Günther Hasinger DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium Titel: Is Dark Matter made up of Primordial B lack Holes? Speaker: Prof. Günther Hasinger\, German Center for Astrophysic s in Görlitz\, University Dresden The cosmic X-ray background radiation has been almost completely resolved into discrete objects\, mainly from the gr owth of massive black holes in the […] X-ALT-DESC;FMTTYPE=text/html:

    Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium

    Titel: Is Dark Matter made up of Primordial Black Holes?

    Speaker: Prof. Günther Hasinger\, German Center for Ast rophysics in Görlitz\, University Dresden

    The cosmic X-ray background radiation has been almost completely
    resolved into discrete objects\, mainly from the growth of massive black
    holes in the universe. Howeve r\, a few years ago\, evidence for a new
    population of black holes fro m the early universe emerged from the
    correlation of fluctuations in t he X-ray and infrared backgrounds.
    Similarly\, quasars have been disco vered with astonishingly massive
    black
    holes already formed short ly after the Big Bang. The detection of
    gravitational waves from the m erger of pairs of very heavy\, apparently
    non-rotating stellar black h oles presents another puzzle. Recently\,
    using the micro-lensing effec t and distance determination with the ESA
    satellite GAIA\, about 20 bl ack holes in our galaxy have been discovered
    with masses that cannot b e generated by stellar processes. In the past
    few months\, the discove ry of several galaxies that formed very early in
    the universe with the James Webb Space Telescope has been surprising\,
    seeming to contradic t the classical understanding of cosmology. All of
    these phenomena can be explained by so-called primordial black holes
    that formed immediat ely after the Big Bang and may represent the
    previously unexplained da rk matter.

    CATEGORIES:Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mpifraifa-m ain-colloquium-speaker-prof-gunther-hasinger/ END:VEVENT BEGIN:VEVENT UID:20231013T0605Z-1697177144.9085-EO-14462-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20231012T142843Z LAST-MODIFIED:20231012T142843Z DTSTART;TZID=Europe/Berlin:20231020T110000 DTEND;TZID=Europe/Berlin:20231020T123000 SUMMARY: MPIfR/AIfA Main Colloquium\, Speaker: Dr. Frank Eisenhauer DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium Titel: Astronomy at Highest Angular Resolutio n – Adaptive Optics\, Interferometry and Black Holes Speaker: Dr. Frank Eis enhauer MPE Garching The last 25 years have seen wonderful times in high an gular resolution\, optical/infrared ground-based astronomy: active optics e nabled ever larger telescopes\, adaptive optics now routinely remove […] X-ALT-DESC;FMTTYPE=text/html:

    Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium

    Titel: Astronomy at Highest Angular Resolution - Adaptive Op tics\, Interferometry and Black Holes

    Speaker: Dr. F rank Eisenhauer MPE Garching

    The last 25 years have seen wonderful ti mes in high angular resolution\, optical/infrared ground-based astronomy: a ctive optics enabled ever larger telescopes\, adaptive optics now routinely remove the image blur from the turbulent earth atmosphere\, and integral f ield spectroscopy adds the third\, spectral dimension to highest resolution imaging. And most recently\, optical/infrared interferometry brought yet a nother revolution by synthesizing a telescope with an equivalent diameter o f a hundred meter and more. We will describe the development and advances i n the field\, and especially the pioneering GRAVITY instrument. Our present ation takes us from exoplanets all the way to distant quasars\, with specia l focus on the Galactic Center and tests of the massive black hole paradigm . The ongoing upgrades will soon boost optical interferometry to the next l evel\, opening up the extragalactic sky for milli-arcsecond resolution inte rferometric imaging. We will end with an outlook on expanding optical inter ferometry to kilometer wide arrays\, which will be hundred to thousand time s sharper than even the largest single dish telescopes.

    CATEGORIES:Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mpifraifa-m ain-colloquium-speaker-dr-frank-eisenhauer/ END:VEVENT BEGIN:VEVENT UID:20231017T2128Z-1697578096.1375-EO-14467-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20231017T114014Z LAST-MODIFIED:20231017T114014Z DTSTART;TZID=Europe/Berlin:20231024T140000 DTEND;TZID=Europe/Berlin:20231024T153000 SUMMARY: PhD colloquium: Cosima Eibensteiner DESCRIPTION: PhD colloquium\, location: Lecture Hall 0.02\, MPIfR Cosima Ei bensteiner Gas matters: The Molecular and Atomic Gas Budget in Nearby Galax ies from Centers to Outskirts Hydrogen is the most fundamental component of the baryonic universe\, and its various phases have played a key role in i ts evolution from the Big Bang to the present day. This dissertation explor es the […] X-ALT-DESC;FMTTYPE=text/html:

    PhD colloquium\, location: Lecture Hall 0. 02\, MPIfR

    Cosima Eibensteiner

    Gas m atters: The Molecular and Atomic Gas Budget in Nearby Galaxies from Centers to Outskirts

    Hydrogen is the most fundamental compon ent of the baryonic universe\, and its various phases have played a key rol e in its evolution from the Big Bang to the present day. This dissertation  explores the hydrogen phases in the interstellar medium (ISM) of nearby dis k galaxies\, focusing on their centers and outskirts. Dynamical processes i n galaxies drive atomic gas mass flows from the outer regions\, which reple nish the central areas with fresh material that converts to molecular gas a nd fuels ongoing star formation. Galaxy centers serve as ideal laboratories to study various molecular line emissions\, revealing insights into the ga s's physical and chemical state. The first scientific project presents obse rvations of the center of the starburst double-barred galaxy NGC 6946\, dem onstrating the impact of an inner bar on molecular gas and using molecular line emission ratios to understand the gas state in various galaxy centers. The atomic gas budget and kinematics in the outskirts of nearby galaxies i s best explored using the 21 cm HI emission. The second project\, using the Karl G. Jansky Very Large Array and Green Bank Telescope\, observes the su per-extended HI disk of galaxy M 83\, detailing how dynamical features infl uence HI velocity dispersion and impacts mass flow rates. The third ongoing project addresses the questions of where in nearby galaxies atomic gas tra nsitions to molecular gas\, using new high-quality observations\, in a samp le of nearby galaxies (within distances of < 20 Mpc).In summary\, this thes is offers insights into molecular and atomic gas in nearby galaxies\, setti ng the stage for future comprehensive studies on galaxy centers and outskir ts to improve our understanding of the physics of ISM gas and its role in g alaxy evolution.

    CATEGORIES:Thesis Defense ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/phd-colloqu ium-cosima-eibensteiner/ END:VEVENT BEGIN:VEVENT UID:20231013T0605Z-1697177144.916-EO-14463-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20231012T143109Z LAST-MODIFIED:20231012T143109Z DTSTART;TZID=Europe/Berlin:20231027T110000 DTEND;TZID=Europe/Berlin:20231027T123000 SUMMARY: MPIfR/AIfA Main Colloquium\, Speaker: Dr. Torsten Enßlin DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium Titel: Astronomical imaging with information field theory Speaker: Dr. Torsten Enßlin MPA Garching Astronomical imaging is the process of translating measurement data into images of the sky that can be understood by humans and analyzed physically. This requires that one or several fields like the […] X-ALT-DESC;FMTTYPE=text/html:

    Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium

    Titel: Astronomical imaging with information field theory

    Speaker: Dr. Torsten Enßlin MPA Garching

    Astrono mical imaging is the process of translating measurement data into images of the sky that can be understood by humans and analyzed physically. This req uires that one or several fields like the brightness as a function of direc tion\, time\, and/or photon energy\, be inferred. Inferring a physical fiel d from data\, however\, is an ill-posed problem\, as the finite data can no t alone constrain the infinite number of degrees of freedom of a function o ver continuous space. Domain knowledge has to regularize the set of possibl e solutions\, however\, usually significant uncertainties remain and need t o be quantified. This can be done via information field theory (IFT)\, whic h is a mathematical formulation of probabilistic signal field inference tha t is related to modern AI/ML methodologies like generative models\, however \, without the need of training. Here\, the basic concepts of IFT and its n umerical implementation are introduced and some of its recent application t o astrophysical datasets are presented that range from gamma ray astronomy over Galactic tomography to black hole imaging.

    CATEGORIES:Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mpifraifa-m ain-colloquium-speaker-dr-torsten-enslin/ END:VEVENT BEGIN:VEVENT UID:20231103T1405Z-1699020323.9763-EO-14482-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20231103T083437Z LAST-MODIFIED:20231103T092419Z DTSTART;TZID=Europe/Berlin:20231103T110000 DTEND;TZID=Europe/Berlin:20231103T120000 SUMMARY: MPIfR/AIfA Main Colloquium\, Speaker: Prof. Dr. Wolfgang Duschl DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium Titel: CMB-driven Growth of (Super-)Massive B lack Holes Speaker: Prof. Dr. Wolfgang Duschl\, University of Kiel During m ost of the lifetime of the Universe\, the evolution of (super-massive) blac k holes (SMBHs) is driven by accretion disks around them and the disks’ int ernal heating. During early phases […] X-ALT-DESC;FMTTYPE=text/html:

    Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium

    Ti tel: CMB-driven Growth of (Super-)Massive Black Holes

    Speaker: Prof. Dr. Wolfgang Duschl\, University of Kiel

    During most of the lifetime of the Universe\, the evolution of (super-massive) black holes (SMBHs) is d riven by accretion disks around
    them and the disks' internal heating. During early phases of the evolution of the Universe\, however\, the Cosmic Microwave Background is
    still warm enough to provide a heat bath for the disk gas. In the talk I will discuss the possible consequences for the disk evolution and thus
    for the growth rates and the distribution of t he Black Holes masses.

     

    CATEGORIES:Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mpifraifa-m ain-colloquium-speaker-prof-dr-wolfgang-duschl/ END:VEVENT BEGIN:VEVENT UID:20231111T1042Z-1699699375.2867-EO-14498-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20231110T094437Z LAST-MODIFIED:20231110T094437Z DTSTART;TZID=Europe/Berlin:20231110T110000 DTEND;TZID=Europe/Berlin:20231110T123000 SUMMARY: MPIfR/AIfA Main Colloquium\, Speaker: Dr. Marcelino Agúndez DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium Titel: The 2020s: the crazy years for interst ellar chemistry Speaker: Dr. Marcelino Agúndez\, Spanish National Research Council (CSIC) To date\, about 300 molecules have been detected in space\, mainly in interstellar clouds at different stages along the star formation process and in circumstellar envelopes around […] X-ALT-DESC;FMTTYPE=text/html:

    Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium

    Ti tel: The 2020s: the crazy years for interstellar chemistry

    Speaker: D r. Marcelino Agúndez\, Spanish National Research Council (CSIC)

    To da te\, about 300 molecules have been detected in space\, mainly in
    inter stellar clouds at different stages along the star formation process
    an d in circumstellar envelopes around evolved stars. The rate of
    detecti ons had remained remarkably constant over time at about four
    molecules per year. However\, only in the last three years 80 new
    molecules hav e been discovered. It is fair to say that we are witnessing
    a golden a ge for astrochemistry\, not only because of the vast number of
    molecul es discovered but also because we are starting to unveil the
    abundant reservoir of organic molecules that interstellar clouds are
    able to sy nthesize and preserve.

    Most of these molecules have been discovered a t the cyanopolyyne peak of
    the prototypical starless core Taurus Molec ular Cloud 1 (TMC-1) thanks
    to two sensitive on-going line surveys tha t use the Yebes 40m and GBT
    radiotelescopes. TMC-1 has been long known for its high content of long
    carbon chains of acetylenic character\, such as polyynes and
    cyanopolyynes\, but now we know that it also cont ains an abundant
    reservoir of large organic cycles\, such as derivativ es of
    cyclopentadiene\, benzene\, indene\, and naphthalene. This is th e first
    time that polycyclic aromatic hydrocarbons (PAHs) are identifi ed
    unequivocally in space after decades of the PAH hypothesis\, which< br />postulated that the widely observed unidentified infrared bands are du e
    to these organic compounds.

    The discovery of so many new molec ules in the last years has important
    implications for astrochemistry\, although we are just starting to
    evaluate them since chemical models cannot digest the vertiginous
    detection rate. These observational resu lts are triggering an intense
    activity in experimental and theoretical physical chemistry to
    understand the formation processes of these new ly detected molecules and
    their role in the chemical evolution of inte rstellar clouds.

    CATEGORIES:Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mpifraifa-m ain-colloquium-speaker-dr-marcelino-agundez/ END:VEVENT BEGIN:VEVENT UID:20231111T1042Z-1699699375.3135-EO-14499-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20231110T143429Z LAST-MODIFIED:20231110T143429Z DTSTART;TZID=Europe/Berlin:20231117T110000 DTEND;TZID=Europe/Berlin:20231117T123000 SUMMARY: MPIfR/AIfA Main Colloquium\, Speaker: Dr. Hector Olivares DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium Titel: Simulating the connection between the large and event-horizon scales of the accretion flow onto Sgr A* Speaker: D r. Hector Olivares\, University of Aveiro Comparing horizon-scale observati ons of Sgr A* and M 87* with libraries of numerical simulations has provide d considerable insight into their interpretation. […] X-ALT-DESC;FMTTYPE=text/html:

    Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium

    Ti tel: Simulating the connection between the large and event-horizon scales o f the accretion flow onto Sgr A*

    Speaker: Dr. Hector Olivares\, Unive rsity of Aveiro

    Comparing horizon-scale observations of Sgr A* and M 87* with libraries of numerical simulations has provided considerable insig ht into their interpretation. However\, most of these simulations are varia tions of the same physical scenario\, which consists of a rotation-supporte d torus seeded with poloidal magnetic fields. This approach faces several c hallenges\, one of the most important being the fact that those models of S gr A* that are able to fit a set of stringent multi-wavelenght constraints fail to reproduce its observed variability. Moreover\, these simulations sh ow significant differences with respect to the predictions of simulated acc retion fed by stellar winds onto this source. In this talk\, we will discus s the exploration of accretion patterns beyond typical tori through numeric al simulations\, and present some attempts to produce simulation setups at event-horizon scales that can incrementally incorporate information from th e larger scale accretion flow.

    CATEGORIES:Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mpifraifa-m ain-colloquium-speaker-dr-hector-olivares/ END:VEVENT BEGIN:VEVENT UID:20231103T1405Z-1699020323.9849-EO-14430-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20231103T084009Z LAST-MODIFIED:20231103T084009Z DTSTART;TZID=Europe/Berlin:20231123T100000 DTEND;TZID=Europe/Berlin:20231123T123000 SUMMARY: IMPRS Seminar: Scientific Writing by Prof. Peter Schneider (Argela nder Institute for Astronomy\, University of Bonn) DESCRIPTION: Scientific Writing Speaker: Prof. Dr. Peter Schneider (AIfA) P ublications\, such as journal papers and theses\, are the prime channel of communicating the results of your research. Therefore\, the quality of a pu blication should match that of the research itself. Clear communication is essential for the work to be understood and appreciated (and cited) by coll eagues. In […] X-ALT-DESC;FMTTYPE=text/html:

    Scientific Writing

    Speaker: Prof. Dr. Peter Schneider (AIfA)

    Publications\, such as journal papers and theses\, are the prime channel
    of communicating the results of your re search. Therefore\, the quality
    of a publication should match that of the research itself. Clear
    communication is essential for the work to be understood and
    appreciated (and cited) by colleagues. In this lectu re\, some basic
    aspects of scientific writing will be outlined\, inclu ding the
    preparation for the write-up\, the structure of a paper\, asp ects of
    clarity (recall: results in natural sciences should be reprodu cible)\,
    some comments on figures\, as well as ethical aspects. In add ition\, we
    will together take a look at the most commonly made mistake s.

    CATEGORIES:Softskills ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/imprs-semin ar-scientific-writing-by-prof-peter-schneider-argelander-institute-for-astr onomy-university-of-bonn/ END:VEVENT BEGIN:VEVENT UID:20231128T2219Z-1701209999.2146-EO-14507-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20231124T115703Z LAST-MODIFIED:20231124T115703Z DTSTART;TZID=Europe/Berlin:20231201T110000 DTEND;TZID=Europe/Berlin:20231201T123000 SUMMARY: MPIfR/AIfA Main Colloquium\, Speaker: Prof. Dr. Marta Sewilo DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium Titel: ALMA Observations of Molecular Complex ity in the Large Magellanic Cloud Speaker: Prof. Dr. Marta Sewilo\, Univers ity of Maryland The Large Magellanic Cloud (LMC) is the nearest laboratory for detailed studies on the formation and survival of complex organic molec ules (COMs)\, including biologically important ones\, […] X-ALT-DESC;FMTTYPE=text/html:

    Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium

    Ti tel: ALMA Observations of Molecular Complexity in the Large Magellanic Clou d

    Speaker: Prof. Dr. Marta Sewilo\, University of Maryland

    The Large Magellanic Cloud (LMC) is the nearest laboratory for detailed studies on the formation and survival of complex organic molecules (COMs)\, includ ing biologically important ones\, in low-metallicity environments - typical of earlier cosmological epochs. In the LMC\, methanol (CH3OH) and larger C OMs have been found toward a handful of hot molecular cores - small\, hot\, and dense regions around forming massive stars where ice mantles have rece ntly been removed from dust grains as a result of thermal evaporation and/o r sputtering in shock waves. Methanol has also been found in multiple locat ions in the LMC outside hot cores (“cold methanol”). Even though the detect ion of only six LMC hot cores has been reported in the literature to date ( five with COMs)\, they show a surprisingly large variation in COM abundance s\; in contrast\, the abundances of S-bearing species such as SO2 and SO do not change significantly from source to source. It was suggested that a la rge COM abundance variation seen in the LMC hot cores is related to the dif ferent physical conditions at the initial stage of star formation. SO2 is e merging as a more reliable hot core tracer than CH3OH in the low-metallicit y environments. I will discuss the detection of three new hot cores in the LMC based on the high-resolution (~0.1 pc) data from the successful Atacama Large Millimeter/submillimeter Array (ALMA) program that already resulted in the identification of two hot cores in the star-forming region N105. The program targeted seven fields in the LMC having common characteristics wit h the first two known LMC hot cores with COMs (they are associated with mas sive Spitzer YSOs\, H2O/OH masers\, and SO emission\, a well-known hot core and shock tracer)\, and covers four ~2 GHz-wide spectral windows between ~ 241.5 GHz and ~260.6 GHz. I will compare the chemical abundances of the new ly identified hot cores to those of the other LMC hot cores\, the only two known hot cores in the Small Magellanic Cloud (with even lower metallicity than that of the LMC)\, and Galactic hot cores\, to elucidate the impact of the environment on hot core chemistry.

    CATEGORIES:Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mpifraifa-m ain-colloquium-speaker-prof-dr-marta-sewilo/ END:VEVENT BEGIN:VEVENT UID:20231103T1405Z-1699020323.9915-EO-14483-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20231103T084901Z LAST-MODIFIED:20231103T084901Z DTSTART;TZID=Europe/Berlin:20231206T140000 DTEND;TZID=Europe/Berlin:20231206T160000 SUMMARY: IMPRS Career event: Exploring Funding Opportunities for Early Care er Researchers DESCRIPTION: Title: Exploring Funding Opportunities for Early Career Resear chers Speakers: Dr. Agustina Sforza\, Viola Tegethoff In this talk\, you wi ll get an overview of the various types of funding available to early caree r researchers\, particularly those who have recently obtained their PhDs or are in the final stages of completion. In addition\, you will gain insight s into […] X-ALT-DESC;FMTTYPE=text/html:

    Title: Exploring Funding Opportuni ties for Early Career Researchers

    Speakers: Dr. Agus tina Sforza\, Viola Tegethoff

    In this talk\, you will get an overview of the various types of funding available to early career researc hers\, particularly those who have recently obtained their PhDs or are in t he final stages of completion. In addition\, you will gain insights into re search funding organisations and their programs. We will also offer valuabl e tips on proposal preparation and guidance on career planning.

    CATEGORIES:Career event ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/imprs-caree r-event-exploring-funding-opportunities-for-early-career-researchers/ END:VEVENT BEGIN:VEVENT UID:20231202T2233Z-1701556399.476-EO-14513-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20231201T131158Z LAST-MODIFIED:20231201T132551Z DTSTART;TZID=Europe/Berlin:20231208T110000 DTEND;TZID=Europe/Berlin:20231208T123000 SUMMARY: MPIfR/AIfA Main Colloquium\, Speaker: Prof. Dr. Andrina Nicola\, A IfA DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium Titel: Cosmological probe combination for cur rent and future surveys Speaker: Prof. Dr. Andrina Nicola\, AIfA Recent pro gress in observational cosmology and the establishment of ΛCDM have relied on the combination of different cosmological probes. These probes are not i ndependent\, since they all measure the same […] X-ALT-DESC;FMTTYPE=text/html:

    Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium

    Ti tel: Cosmological probe combination for current and future surveys

    Sp eaker: Prof. Dr. Andrina Nicola\, AIfA

    Recent progress in observation al cosmology and the establishment of ΛCDM have relied on the combination o f different cosmological probes. These probes are not independent\, since t hey all measure the same physical fields\, and the resulting cross-correlat ions thus allow for robust tests of the cosmological model and for the char acterization of systematics. In this talk\, I will give an overview of the results of the Hyper Suprime Cam Year 3 Fourier-space cosmic shear analysis . In addition\, I will discuss the potential of combining weak lensing with FRBs and secondary CMB anisotropies to constrain baryonic feedback effects on the matter distribution\, which are a key systematic for both ongoing a nd upcoming surveys.

    CATEGORIES:Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mpifraifa-m ain-colloquium-speaker-prof-dr-andrina-nicola-aifa/ END:VEVENT BEGIN:VEVENT UID:20231202T2233Z-1701556399.5527-EO-14514-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20231201T132955Z LAST-MODIFIED:20231201T133050Z DTSTART;TZID=Europe/Berlin:20231214T110000 DTEND;TZID=Europe/Berlin:20231214T133000 SUMMARY: PhD colloquium: Laura Ann Busch DESCRIPTION: PhD colloquium\, location: MPIfR Laura Ann Busch Formation and desorption of organic molecules: Resolving their emission in a prominent p rotostellar hot core and its outflow X-ALT-DESC;FMTTYPE=text/html:

    PhD colloquium\, location: MPIfR

    Lau ra Ann Busch

    Formation and desorption of organic molecules: R esolving their emission in a prominent protostellar hot core and its outflo w

    CATEGORIES:Thesis Defense ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/phd-colloqu ium-laura-ann-busch/ END:VEVENT BEGIN:VEVENT UID:20231219T1439Z-1702996768.1157-EO-14520-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20231219T091142Z LAST-MODIFIED:20231219T091142Z DTSTART;TZID=Europe/Berlin:20231222T110000 DTEND;TZID=Europe/Berlin:20231222T123000 SUMMARY: MPIfR/AIfA Main Colloquium\, Speaker: Dr. Bart Ripperda DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium Titel: TBD Speaker: Dr. Bart Ripperda\, Insti tute for Advanced Study X-ALT-DESC;FMTTYPE=text/html:

    Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium

    Ti tel: TBD

    Speaker: Dr. Bart Ripperda\, Institute for Advanced Study

    CATEGORIES:Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mpifraifa-m ain-colloquium-speaker-dr-bart-ripperda/ END:VEVENT BEGIN:VEVENT UID:20231202T2233Z-1701556399.5597-EO-14515-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20231201T133027Z LAST-MODIFIED:20231213T185410Z DTSTART;TZID=Europe/Berlin:20240110T100000 DTEND;TZID=Europe/Berlin:20240110T110000 SUMMARY: PhD colloquium: Jompoj Wongphecauxsorn DESCRIPTION: PhD colloquium\, location: MPIfR Jompoj Wongphecauxsorn Search ing for pulsars in the Galactic centre Pulsars are rotating neutron stars t hat emit pulsating signals. They serve as valuable tools for studying a wid e range of topics\, from general relativity to the interstellar medium. The discovery of a pulsar in the Galactic centre (GC) would be particularly fa scinating due […] X-ALT-DESC;FMTTYPE=text/html:

    PhD colloquium\, location: MPIfR

    Jom poj Wongphecauxsorn

    Searching for pulsars in the Galactic cen tre

    Pulsars are rotating neutron stars that emit pulsating s ignals. They serve as valuable tools for studying a wide range of topics\, from general relativity to the interstellar medium. The discovery of a puls ar in the Galactic centre (GC) would be particularly fascinating due to its proximity to the Sgr A*\, the black hole at the centre of our Galaxy. Such a discovery could provide insights into the local environment and the natu re of the black hole itself. In the GC\, up to 1000 pulsars were predicted\ , but thus far only six have been found\, including a magnetar. One of the explanations is that the dense environment in the GC causes extreme interst ellar scattering\, reducing the sensitivity of pulsar surveys\, particularl y for short-period pulsars. To improve our sensitivity to long-period pulsa rs\, a Fast Folding Algorithm (FFA) was used rather than the traditional Fa st Fourier Transform (FFT). During my study\, an FFA pipeline for accelerat ed pulsars was implemented for the first time to search for pulsars within 1 deg around GC using the data from the High Time Resolution Universe Pulsa r Survey-South Low latitude. In this work\, a new slow pulsar (PSR J1746-28 29) was discovered with an angular distance of ~0.5 deg from the GC. Follow -up observations revealed that this pulsar has properties that are usually associated with radio magnetars. Interestingly\, there is another object in the GC that shows magnetar-like properties\, in addition to the known magn etar. This may suggest that the GC has an anomalously large fraction of mag netars to non-recycled pulsars compared to the rest of the Galaxy. Extreme interstellar scattering can significantly reduce the sensitivity of pulsar surveys. Fortunately\, the scattering time is decreasing with the fourth po wer of the observing frequency. As a result\, the FFA pipeline for accelera ted pulsars was modified to search for a high observational frequency (230 GHz) dataset from the three most sensitive stations from the Event Horizon Telescope observations of Sgr A* in 2017. This survey is the highest freque ncy pulsar survey to date\, leading to negligible interstellar effects. How ever\, pulsars have a steep spectrum\, making them dimmer at higher frequen cies\, and harder to detect. We used the FFA and FFT with acceleration sear ch pipelines to search for pulsars in this dataset\, but no new pulsars wer e detected. The further empirical sensitivity analysis shows that we are on ly sensitive to less than 2\\% of the known pulsar population in this searc h\, with less sensitivity on the slow pulsars\, highlighting the need for F FA searches.

    CATEGORIES:Thesis Defense ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/phd-colloqu ium/ END:VEVENT BEGIN:VEVENT UID:20230722T2101Z-1690059693.2744-EO-14368-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20230720T132826Z LAST-MODIFIED:20231219T090931Z DTSTART;VALUE=DATE:20240114 DTEND;VALUE=DATE:20240118 SUMMARY: IMPRS A&A Retreat at Schloss Ringberg. DESCRIPTION: The IMPRS for Astronomy and Astrophysics in Bonn and Cologne a nd the IMPRS for Gravitational Wave Astronomy in Hannover are collaborating for a two-day conference at Schloss Ringberg. The event\, under the direct ion of Anton Zensus and Karsten Danzmann\, will feature a focused program o f talks by distinguished scientists and opportunities for individual intera ction and mentoring. […] X-ALT-DESC;FMTTYPE=text/html: 
    The IMPRS for Astronomy and Astrophysics
  in Bonn and Cologne and the IMPRS for Gravitational Wave Astronomy in Hann
 overare collaborating for a two-day conference at Schloss Ringberg. The eve
 nt\, under the direction of Anton Zensus and Karsten Danzmann\,will feature
  a focused program of talks by distinguished scientists and opportunities f
 or individual interaction and mentoring. Group work and brief presentations
  will supplement the program and develop presentation and outreach skills. 
 We have also invited Prof. Amelie Saintonge\, prospective Director at the M
 PIfR\, Prof. Andrina Nicola\, who recently joined the AIfA\, and Prof. Guid
 o Müller\, the new director at the AEI to join us. Ringberg will provide an
  ideal environment for intensive scientific discussions and a memorable exp
 erience for all attendees.
    CATEGORIES:Retreat ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/imprs-aa-re treat/ END:VEVENT BEGIN:VEVENT UID:20240116T0217Z-1705371444.4367-EO-14526-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20240112T175828Z LAST-MODIFIED:20240112T175828Z DTSTART;TZID=Europe/Berlin:20240118T140000 DTEND;TZID=Europe/Berlin:20240118T153000 SUMMARY: PhD colloquium: Xiao-Tian Xu DESCRIPTION: PhD colloquium\, location: Auditorium 0.02\, MPIfR Xiao-Tian X u Comprehensive population synthesis predictions for massive binary stars i n the Small Magellanic Cloud Abstract: The past and ongoing gravitational w ave detections have fostered a wide interest in understanding the formation of binary black holes (BBHs). Several formation scenarios have been propos ed\, including the evolution of isolated massive binaries. […] X-ALT-DESC;FMTTYPE=text/html:

    PhD colloquium\, location: Auditorium 0.02 \, MPIfR

    Xiao-Tian Xu

    Comprehensive population synthesis predic tions for massive binary stars in the Small Magellanic Cloud

    Abstract:

    The past and ongoing gravitational wave detections have fo stered a wide interest in understanding the formation of binary black holes (BBHs). Several formation scenarios have been proposed\, including
    th e evolution of isolated massive binaries. While most of the observed mergin g black holes are at cosmological distances\, and thus likely at low metall icity\, the Small Magellanic Cloud (SMC) — one
    of the satellite galaxi es of the Milky Way — provides a unique laboratory to probe the binary scen ario thanks to its rich massive star population and low metallicity. In thi s thesis\, we provide comprehensive
    synthetic SMC populations of massi ve binary stars throughout all their different evolutionary stages\, based on a dense grid of more than 50\,000 detailed binary evolution models.

    < p>As stars expand when they age\, mass transfer occurs in most of our model s. This leads to a spin-up of the mass gainers to produce rapidly rotating so called Be/Oe emission line stars\, which are abundant
    in the SMC. T he mass donors\, if massive enough\, may form so called Wolf-Rayet (WR) sta rs\, which are hydrogen deficient and have emission line dominated spectra. Our models predict 7 so called WR
    + main sequence star (MS) binaries in the SMC\, which roughly matches the observed number\, even though our mo dels produce more long-period WR binaries than observed. At the same time\, our
    synthetic population contains ∼ 200 BH+MS binaries\, mostly assoc iated with Be/Oe stars\, which are so far undetected. We show that this is not in contradiction to the small number of wind-accreting
    BH+MS binar ies observed through their X-ray emission. We also predict a neutron star ( NS) +MS population\, for which our models reproduce the orbital period dist ribution of the observed rich
    Be/X-ray binary population\, but not the ir number. On the other hand\, we predict a so far undiscovered group of X- ray quiet NS binaries with orbital periods below 10 days.

    We then use semi-analytic methods to investigate which of our BH+MS binaries can evolv e into a BH+WR system\, which of those evolve further into a BBH\, and whic h of those can merge within
    the Hubble time. Our results predict a hig h BH companion fraction for WR stars\, and 2-3 BH+WR binaries in the SMC. O ur prediction on merging BBHs is sensitive to several model assumptions.
    The main features of the observed merging BBH population can be reproduc ed by our model\, with common envelope evolution and stable mass transfer e volution contributing about equally.
    In conclusion\, while our model i n part agrees with the observed populations\, it also raises new questions. In particular\, there is an apparent lack of long-period massive evolved b inaries with WR
    or BH components. As those are harder to detect than t he shorter period counterparts\, we hope that future observing campaigns wi ll have the power to resolve this issue

    CATEGORIES:Thesis Defense ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/phd-colloqu ium-xiao-tian-xu/ END:VEVENT BEGIN:VEVENT UID:20240111T0141Z-1704937293.4279-EO-14525-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20240105T164851Z LAST-MODIFIED:20240105T164851Z DTSTART;TZID=Europe/Berlin:20240119T110000 DTEND;TZID=Europe/Berlin:20240119T123000 SUMMARY: MPIfR/AIfA Main Colloquium\, Speaker: Dr. Elena Redaelli DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium Titel: Molecules as probes to unveil how star s form Speaker: Dr. Elena Redaelli\, MPE Brief abstract: Research into star formation is a highly active area of modern astrophysics. Stars are born i n dense and cold environments known as molecular clouds\, which appear as d ark patches […] X-ALT-DESC;FMTTYPE=text/html:

    Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium

    Ti tel: Molecules as probes to unveil how stars form

    Speaker: Dr. Elena Redaelli\, MPE

    Brief abstract: Research into star formation is a high ly active area of modern astrophysics. Stars are born in dense and cold env ironments known as molecular clouds\, which appear as dark patches in the n ight sky as optical radiation cannot penetrate them. Since these clouds are composed of molecules\, molecular transitions at radio and microwave wavel engths represent the ideal diagnostic tool to probe these phases of the int erstellar medium. I will show how through their analysis we can infer the p hysical and chemical structure of star-forming regions\, to understand how they evolve. I will showcase examples of the power of this technique in bot h the low- and the high-mass regimes\, each with its set of challenges.

    CATEGORIES:Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mpifraifa-m ain-colloquium-speaker-dr-elena-redaelli/ END:VEVENT BEGIN:VEVENT UID:20231216T1122Z-1702725733.7509-EO-14518-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20231213T142431Z LAST-MODIFIED:20231213T185234Z DTSTART;TZID=Europe/Berlin:20240125T140000 DTEND;TZID=Europe/Berlin:20240125T160000 SUMMARY: IMPRS Career event: What is Germany actually doing in space scienc e – or why Space X would not re-land without DLR DESCRIPTION: Title: What is Germany actually doing in space science – or wh y Space X would not re-land without DLR Speakers: Dr. Anke Pagels-Kerp\, DL R What is the difference between a probe and a satellite? Who builds rocket s and why is a satellite built for the first 10 minutes? Why does a power b ox need a satnav […] X-ALT-DESC;FMTTYPE=text/html:

    Title: What is Germany actually doing in s pace science - or why Space X would not re-land without DLR

    Speakers: Dr. Anke Pagels-Kerp\, DLR

    What is the differ ence between a probe and a satellite? Who builds rockets and why is a satel lite built for the first 10 minutes? Why does a power box need a satnav and what happens when it no longer knows where it is?

    Space research in Germany is not a niche subject but is firmly anchored in universities\, res earch institutes and industry.

    Germany is the largest contributor to European Space Agency ESA and leads many projects\, especially in the scien ce programmes. At the same time\, there is a lot of co-operation at bilater al or multilateral level with\, for example\, NASA or JAXA.

    Curious a bout Space Science?

     

     

    CATEGORIES:Career event ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/imprs-caree r-event-what-is-germany-actually-doing-in-space-science-or-why-space-x-woul d-not-re-land-without-dlr/ END:VEVENT BEGIN:VEVENT UID:20240129T1122Z-1706527352.8296-EO-14529-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20240125T162018Z LAST-MODIFIED:20240125T162018Z DTSTART;TZID=Europe/Berlin:20240202T110000 DTEND;TZID=Europe/Berlin:20240202T123000 SUMMARY: MPIfR/AIfA Main Colloquium\, Speaker: Dr. Enrique Lopez-Rodriguez DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium Titel: Extragalactic Magnetism using far-infr ared polarimetry Speaker: Dr. Enrique Lopez-Rodriguez\, Stanford University Galaxy evolution strongly depends on the physics of the interstellar mediu m (ISM). The ISM is permeated by B-fields\, in which magnetic energy is in close equipartition with the thermal energy. This physical condition […] X-ALT-DESC;FMTTYPE=text/html:

    Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium

    Ti tel: Extragalactic Magnetism using far-infrared polarimetry

    Speaker: Dr. Enrique Lopez-Rodriguez\, Stanford University

    Galaxy evolution st rongly depends on the physics of the interstellar medium (ISM). The ISM is permeated by B-fields\, in which magnetic energy is in close equipartition with the thermal energy. This physical condition makes the B-fields dynamic ally important at several stages of galaxy evolution affecting gas flows in the ISM and driving gas inwards toward the galaxy's centers\, and outwards toward the intergalactic medium via galactic outflows. Thus\, B-fields rem ain an important\, but still highly ignored\, ingredient to understanding t he evolution of galaxies across cosmic time. Far-infrared and sub-mm wavele ngths have recently been key to providing a complete picture of extragalact ic magnetism by doing what only HAWC+/SOFIA\, JCMT/POL-2\, and ALMA can do: measuring magnetic fields in the densest areas of the universe. Using FIR/ Sub-mm and radio polarimetric observations\, in combination with the kinema tics of the neutral and molecular gas\, a topographic study of B-field in g alaxies is characterized for the first time. In this talk\, I will present the results of SALSA (Survey for extragALactic magnetiSm with SOFIA Legacy Program): the magnetic properties in the multi-phase ISM of nearby galaxies observed in the wavelength range of 50-890 um. These results have opened a new window of exploration on galaxy evolution and provide the building blo cks for scientific cases of future IR polarimetric missions.

    CATEGORIES:Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mpifraifa-m ain-colloquium-speaker-dr-enrique-lopez-rodriguez/ END:VEVENT BEGIN:VEVENT UID:20240129T1122Z-1706527352.8388-EO-14530-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20240125T162357Z LAST-MODIFIED:20240125T162357Z DTSTART;TZID=Europe/Berlin:20240209T160000 DTEND;TZID=Europe/Berlin:20240209T173000 SUMMARY: MPIfR/AIfA Main Colloquium\, Speaker: Dr. Sara Ellison DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium Titel: Clash of the Titans: Galaxy mergers in the nearby Universe Speaker: Dr. Sara Ellison\, University of Victoria Ast ronomy’s current model of galaxy evolution is built on a foundation of hier archical growth\, in which small galaxies merge together to form larger one s. In addition to […] X-ALT-DESC;FMTTYPE=text/html:

    Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium

    Ti tel: Clash of the Titans: Galaxy mergers in the nearby Universe

    Speak er: Dr. Sara Ellison\, University of Victoria

    Astronomy's current mod el of galaxy evolution is built on a foundation of hierarchical growth\, in which small galaxies merge together to form larger ones. In addition to th e simple accrual of mass\, this merging process is predicted to fundamental ly change the galaxies properties\, such as dramatic morphological transfor mations\, the triggering of bursts of star formation and high rates of accr etion onto the central supermassive black hole. In this talk I will explain the physical processes behind these predictions\, and present the observat ions that we are performing in order to test the theory. Although many of t he predictions are indeed borne out by experiment\, there have been some su rprising conflicts as well\, that demand revisions to our models of how mer gers shape galaxy evolution.

    CATEGORIES:Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mpifraifa-m ain-colloquium-speaker-dr-sara-ellison/ END:VEVENT BEGIN:VEVENT UID:20240129T1122Z-1706527352.8642-EO-14528-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20240124T172138Z LAST-MODIFIED:20240124T172138Z DTSTART;TZID=Europe/Berlin:20240222T140000 DTEND;TZID=Europe/Berlin:20240222T170000 SUMMARY: IMPRS career event: Working at REWE Analytics DESCRIPTION: Title: Working at REWE Analytics Speakers: Dr. Axel Buddendiek \, Rebecca Lass\, Dr. Paul Rohde In this talk\, we will give insights about the REWE Group Analytics Department. REWE Group\, mostly known as one of t he biggest supermarket chains in Germany\, relies heavily on data analytics to improve its business. As data scientists and product owners who […] X-ALT-DESC;FMTTYPE=text/html:

    Title: Working at REWE Analytics

    Speakers: Dr. Axel Buddendiek\, Rebecca Lass\, Dr. Pa ul Rohde

    In this talk\, we will give insights about the REWE Group Analytics Department. REWE Group\, mostly known as one of the bigges t supermarket chains in Germany\, relies heavily on data analytics to impro ve its business. As data scientists and product owners who have degrees in Math\, Physics and Astronomy and successfully transitioned into data analyt ics\, we will talk about our daily work at REWE.

    We start with a shor t introduction about REWE Group and especially about the Analytics Departme nt. We will give insights into our daily work as Data Scientists and Produc t Owners at REWE Group. After this introduction we will present deep dives about two of our projects. The first one\, APE\, is a recommender system th at uses machine learning to personalize the REWE couponing experience. The second one\, LEO\, is a product that uses modern analytics to decide about the marketing media mix of weekly discounted REWE products. This is especia lly important since last summer REWE stopped printing and distributing its leaflet. In the end\, we will show what kind of roles are suitable for scie ntists who want to transition into data analytics.

    CATEGORIES:Career event ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/imprs-caree r-event-working-at-rewe-analytics/ END:VEVENT BEGIN:VEVENT UID:20240302T0224Z-1709346263.4054-EO-14547-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20240227T111836Z LAST-MODIFIED:20240227T111836Z DTSTART;TZID=Europe/Berlin:20240229T130000 DTEND;TZID=Europe/Berlin:20240229T140000 SUMMARY: PhD colloquium: Maude Charmetant DESCRIPTION: PhD colloquium\, location: Auditorium 0.02\, MPIfR Maude Charm etant Sunyave-Zeldovich Power Spectrum Measurements Predictions for upcomin g ground-based telescopes The objective of the thesis was to make predictio ns of thermal Sunyaev-Zeldovich (tSZ) and kinematic Sunyaev-Zeldovich (kSZ) effects detection for the upcoming ground-based experiments Simons Observa tory Large Aperture Telescope (SOLAT) and the Fred Young Submillimeter Tele scope (FYST). The tSZ […] X-ALT-DESC;FMTTYPE=text/html:

    PhD colloquium\, location: Auditorium 0.02 \, MPIfR

    Maude Charmetant

    Sunyave-Zeldovich Power Spect rum Measurements Predictions for upcoming ground-based telescopes< /p>

    The objective of the thesis was to make predictions of thermal Sunyae v-Zeldovich (tSZ) and kinematic Sunyaev-Zeldovich (kSZ) effects detection f or the upcoming ground-based experiments Simons Observatory Large Aperture Telescope (SOLAT) and the Fred Young Submillimeter Telescope (FYST). The tS Z effect is due to the inverse Compton scattering of the Cosmic Microwave B ackground (CMB) photons on the hot electrons in galaxy clusters and the kSZ effect to the Doppler shift generated by the cluster's motion relative to the CMB. These effects are crucial probes of cluster properties and cosmolo gical parameters. Extracting information requires the cleanest possible SZ measurements\, which is extremely challenging considering the numerous cont aminating signals and their weak amplitude. We simulated the microwave emis sion maps for the SOLAT and FYST surveys. Using component separation techni ques\, we have extracted the tSZ and kSZ signals back. We show that combine d survey data from SOLAT and FYST will reduce the Cosmic Infrared Backgroun d (CIB) power spectrum residual in the tSZ power spectrum by up to 35% comp ared to SOLAT. We showed that SOLAT could achieve a significant detection o f the cross-correlation between tSZ and kSZ squared.

    CATEGORIES:Thesis Defense ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/phd-colloqu ium-maude-charmetant/ END:VEVENT BEGIN:VEVENT UID:20240305T0537Z-1709617027.5276-EO-14551-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20240304T105526Z LAST-MODIFIED:20240307T100426Z DTSTART;TZID=Europe/Berlin:20240307T124500 DTEND;TZID=Europe/Berlin:20240307T143000 SUMMARY: MPIfR/AIfA Main Colloquium\, Speaker: Prof. Dr. Tom Ray DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium Titel: What Webb is Revealing About the Very Earliest Stages of Star Formation Speaker: Prof. Dr. Tom Ray\, Dublin Insti tute for Advanced Studies +++ Note the unusual time to accommodate the spea ker +++ One of the primary goals of the James Webb Space Telescope (JWST) [ …] X-ALT-DESC;FMTTYPE=text/html:

    Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium

    Ti tel: What Webb is Revealing About the Very Earliest Stages of Star Formatio n

    Speaker: Prof. Dr. Tom Ray\, Dublin Institute for Advanced Studies< /p>

    +++ Note the unusual time to accommodate the speaker +++

    One of the primary goals of the James Webb Space Telescope (JWST ) is to investigate the very earliest stages of star formation. This is a t ask well suited to JWST as it is capable of observing through dust-enshroud ed molecular clouds with unprecedented spatial resolution and sensitivity. After reviewing JWST’s capabilities\, I will explore what we have learned i n the first 18 months of operation about the outflows that the youngest sta rs launch\, the chemistry of their associated accretion disks\, and the rel ationship between the two.

    CATEGORIES:Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mpifraifa-m ain-colloquium-speaker-prof-dr-tom-ray/ END:VEVENT BEGIN:VEVENT UID:20240310T1134Z-1710070496.9304-EO-14561-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20240308T142427Z LAST-MODIFIED:20240308T142427Z DTSTART;TZID=Europe/Berlin:20240315T110000 DTEND;TZID=Europe/Berlin:20240315T123000 SUMMARY: MPIfR/AIfA Main Colloquium\, Speaker: Dr. Julia Stadler DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium Titel: Perturbative Forward Modeling of Galax y Surveys for Field-Level Analysis and Beyond Speaker: Dr Julia Stadler\, M PA A new generation of galaxy surveys is soon to release their first data. While holding the potential to transform our understanding of the origin an d evolution of the […] X-ALT-DESC;FMTTYPE=text/html:

    Max Planck Institute for Radio Astronomy/A rgelander Institute for Astronomy Main Colloquium

    Titel: Perturbative Forward Modeling of Galaxy Surveys for Field-Level Analysis and Beyond

    Speaker: Dr Julia Stadler\, MPA

    A new generation of galaxy surveys is soon to release their first data. While holding the potential to transf orm our understanding of the origin and evolution of the Universe\, the ana lysis of these datasets poses considerable challenges. The state-of-the-art approach compares theory and data in terms of summary statistics\, such as the galaxy power spectrum. However\, information is lost in this compressi on. Another major concern is theoretical uncertainties in the small-scale p rocesses of galaxy formation and consequently in the galaxy bias relation. Forward modeling the three-dimensional large-scale galaxy density enables t he comparison between model and data at the level of density fields\, and t hereby it foregoes the loss of information in the data compression step. By basing the forward model on perturbative methods\, namely the Effective Fi eld Theory of Large Scale Structure (EFT of LSS)\, one can robustly margina lize over theoretical uncertainties in the galaxy bias relation. Such an an alysis not only provides tight cosmological parameter constraints but also offers insights into the initial conditions and structure formation history over the survey volume. I will discuss the status of field-level analysis for galaxy clustering and show results and developments with the LEFTfield code. Forward modeling allows for the self-consistent incorporation of many observational effects\, and I discuss redshift-space distortions as an imp ortant step on the way to realizing the potential of this technique for obs ervational data.

    CATEGORIES:Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mpifraifa-m ain-colloquium-speaker-dr-julia-stadler/ END:VEVENT BEGIN:VEVENT UID:20231219T1439Z-1702996768.1435-EO-14522-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20231219T091619Z LAST-MODIFIED:20231219T091619Z DTSTART;TZID=Europe/Berlin:20240322T110000 DTEND;TZID=Europe/Berlin:20240322T123000 SUMMARY: MPIfR/AIfA Main Colloquium\, Speaker: Prof. Dr. Tessa Baker DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium Titel: Cosmology with Gravitational Wave Sire ns Speaker: Prof. Dr. Tessa Baker\, University of Portsmouth The first eigh t years of direct gravitational wave detection have had a huge impact not o nly on astrophysics\, but also on cosmology and fundamental physics. Centra l to these developments have been […] X-ALT-DESC;FMTTYPE=text/html:

    Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium

    Ti tel: Cosmology with Gravitational Wave Sirens

    Speaker: Prof. Dr. Tess a Baker\, University of Portsmouth

    The first eight years of direct gr avitational wave detection have had a huge impact not only on astrophysics\ , but also on cosmology and fundamental physics. Central to these developme nts have been Sirens\, gravitational wave sources for which we can measure both distances and redshifts. The most spectacular kind of sirens are multi messenger events like the binary neutron star merger GW170817\, with both g ravitational wave and electromagnetic counterparts. However\, these represe nt only a tiny fraction of all gravitational wave events. So are all the ot her gravitational wave events useless\, from a cosmology perspective? In th is talk I'll introduce the alternative Dark Sirens method\, which enables u s to extract cosmology from regular\, non-counterpart gravitational wave ev ents. I'll explain how this technique can be used to obtain an independent measurement of the Hubble constant\, and also to test the laws of gravity o perating on the largest scales. I'll describe some subtleties that require careful handling\, (hopefully!) convince you that we can overcome them\, an d show the latest results obtained from gravitational wave detections to da te.

    CATEGORIES:Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mpifraifa-m ain-colloquium-speaker-prof-dr-tessa-baker/ END:VEVENT BEGIN:VEVENT UID:20240206T1617Z-1707236237.6311-EO-14543-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20240206T101924Z LAST-MODIFIED:20240206T101924Z DTSTART;TZID=Europe/Berlin:20240412T110000 DTEND;TZID=Europe/Berlin:20240412T123000 SUMMARY: MPIfR/AIfA Main Colloquium\, Speaker: Dr. Elena Redaelli DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium Titel: Molecules as probes to unveil how star s form Speaker: Dr. Elena Redaelli\, MPE Research into star formation is a highly active area of modern astrophysics. Stars are born in dense and cold environments known as molecular clouds\, which appear as dark patches in t he […] X-ALT-DESC;FMTTYPE=text/html:

    Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium

    Ti tel: Molecules as probes to unveil how stars form

    Speaker: Dr. Elena Redaelli\, MPE

    Research into star formation is a highly active area o f modern astrophysics. Stars are born in dense and cold environments known as molecular clouds\, which appear as dark patches in the night sky as opti cal radiation cannot penetrate them. Since these clouds are composed of mol ecules\, molecular transitions at radio and microwave wavelengths represent the ideal diagnostic tool to probe these phases of the interstellar medium . I will show how through their analysis we can infer the physical and chem ical structure of star-forming regions\, to understand how they evolve. I w ill showcase examples of the power of this technique in both the low- and t he high-mass regimes\, each with its set of challenges.

    CATEGORIES:Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mpifraifa-m ain-colloquium-speaker-dr-elena-redaelli-2/ END:VEVENT BEGIN:VEVENT UID:20240412T1049Z-1712918945.3265-EO-14590-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20240411T113847Z LAST-MODIFIED:20240411T113847Z DTSTART;TZID=Europe/Berlin:20240426T160000 DTEND;TZID=Europe/Berlin:20240426T173000 SUMMARY: PhD colloquium: Timea Kovács DESCRIPTION: PhD colloquium\, location: Auditorium 0.02\, MPIfR Timea Kovác s The redshift evolution of galactic-scale magnetic fields Magnetic fields play an important role in galaxy evolution\, from processes such as gas dyn amics and star formation to galactic outflows. However\, the redshift evolu tion of galactic-scale magnetic fields is not well constrained\, both obser vations and theoretical predictions are lacking\, with […] X-ALT-DESC;FMTTYPE=text/html:

    PhD colloquium\, location: Auditorium 0.02 \, MPIfR

    Timea Kovács

    The redshift evolution of galacti c-scale magnetic fields

    Magnetic fields play an important ro le in galaxy evolution\, from processes such as gas dynamics and star forma tion to galactic outflows. However\, the redshift evolution of galactic-sca le magnetic fields is not well constrained\, both observations and theoreti cal predictions are lacking\, with only a handful of direct magnetic field strength measurements in distant galaxies. In my talk\, I will present my r esults from both radio polarimetric observations and synthetic observations made with the IllustrisTNG50 simulation. First\, I will present the analys is of broadband (1 - 8 GHz) spectro-polarimetric Very Large Array observati ons of two lensing systems (B1600+434 and B0218+357). Using these\, we meas ured the halo magnetic field of a distant galaxy at z=0.414 (corresponding to 4.4 Gyr ago) for the first time with a strength of 1.2 - 1.8 uG\, and fo und an axisymmetric disk field of 2 - 20 uG in a lensing galaxy at z=0.685 (6.3 Gyr ago)\, in agreement with the magnetic field strength and structure of nearby galaxies. Then\, I will show how the observables of magnetic fie lds evolve over redshift using 16 500 galaxies at redshifts of 0 < z < 2 fr om the state-of-the-art cosmological magneto-hydrodynamic simulation Illust risTNG50. I explore two methods used to obtain cosmic magnetic field streng ths: deriving the magnetic field strength of intervening galaxies in front of polarized background quasars and deriving the magnetic field strength of the IGM by utilizing FRBs. In the near future\, we expect the number of kn own lensing systems\, quasars with intervening galaxies\, and polarized FRB s to dramatically increase by tens of thousands of systems due to new radio surveys and telescopes. The results I am presenting demonstrate how the le nsing method can be applied to different galaxies\, and predict measuring t he magnetic field strength of the IGM with a 2 rad m^-2 precision using FRB s will be possible in under 10 years.

    CATEGORIES:Thesis Defense ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/phd-colloqu ium-timea-kovacs/ END:VEVENT BEGIN:VEVENT UID:20240423T0719Z-1713856783.3706-EO-14591-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20240422T170245Z LAST-MODIFIED:20240503T081112Z DTSTART;TZID=Europe/Berlin:20240503T110000 DTEND;TZID=Europe/Berlin:20240503T143000 SUMMARY: MPIfR/AIfA Main Colloquium\, Speaker: Prof. Dr. Thorsten Kleine\, MPI for Solar System Research + For IMPRS students: Meet the speaker DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium Titel: Origin of terrestrial water Speaker: P rof. Dr. Thorsten Kleine\, MPI for Solar System Research Meet the speaker: Students and postdocs from all IMPRS A&\;A partner institutes are invit ed to have a discussion with Prof. Kleine following the event. Abstract Col loquium: Earth contains several oceans […] X-ALT-DESC;FMTTYPE=text/html:

    Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium

    Ti tel: Origin of terrestrial water

    Speaker: Prof. Dr. Thorsten Kleine\, MPI for Solar System Research

    Meet the speaker: Students and postdocs from all IMPRS A&A partner institutes are invited to have a discu ssion with Prof. Kleine following the event.

    Abstract Colloq uium:

    Earth contains several oceans of water. Determining the origin of this
    water is key not only for understanding how Earth formed\, but also for
    identifying the processes that made it a habitable planet. I n general\,
    Earth may have accreted water from its main building mater ial or from an
    exotic source that otherwise contributed little mass to Earth. In this
    talk I will show how meteorites\, left-over fragments from the earliest
    stages of planet formation\, can be used to distingu ish between these two
    possibilities and thus help to reconstruct how a nd from where Earth
    accreted its water.

    CATEGORIES:IMPRS,Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mpifraifa-m ain-colloquium-speaker-prof-dr-thorsten-kleine-mpi-for-solar-system-researc h-for-imprs-students-meet-the-speaker/ END:VEVENT BEGIN:VEVENT UID:20240522T1454Z-1716389652.4722-EO-14598-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20240513T142650Z LAST-MODIFIED:20240513T142650Z DTSTART;TZID=Europe/Berlin:20240517T110000 DTEND;TZID=Europe/Berlin:20240517T123000 SUMMARY: MPIfR/AIfA Main Colloquium\, Speaker: Dr. Jaques Roland\, Observat oire de Paris DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium Titel: On the origin of the VLBI astrometric variability of extragalactic radio sources Speaker: Dr. Jaques Roland\, Obs ervatoire de Paris Variations of the flux density of the nucleus of an extr agalactic radio source can be due either to the variations of the synchrotr on spectra of […] X-ALT-DESC;FMTTYPE=text/html:

    Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium

    Ti tel: On the origin of the VLBI astrometric variability of extragalactic rad io sources

    Speaker: Dr. Jaques Roland\, Observatoire de Paris

    V ariations of the flux density of the nucleus of an extragalactic radio sour ce can be due either to the variations of the synchrotron spectra of the bl ack holes contained in the nucleus\, or to the ejection of VLBI components. As a consequence of the variations of the synchrotron spectra of the black holes\, there will be periods during which the low frequency and the high frequency observations will be aligned on the same BH\, say BH1\, and perio ds during which the low frequency and the high frequency observations will be aligned on different BHs\, say BH1 and BH2. We obtained centroid positio n time series at 15 GHz from MOJAVE modelfitting giving epoch positions of the VLBI components and for each epoch\, we calculated the 15~GHz flux bary center positions using a beam $B = 2$ mas which corresponds to the $8$~GHz beam. The comparison of the $8$~GHz and $15$~GHz time series shows that: a) the time series are generally correlated\, but they can be anti-correlated during some periods and b) the absolute position of the ICRF3 survey corre sponds to the mean position of the $15$~GHz flux density barycenter within $\\leq 0.100$ mas$. The comparison of the $8$ and $15$~GHz has been done fo r 2201+315 which structure of the nucleus is known and for 0851+202 and 092 3+392 which structures of the nucleus are not known.

    CATEGORIES:Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mpifraifa-m ain-colloquium-speaker-dr-jaques-roland-observatoire-de-paris/ END:VEVENT BEGIN:VEVENT UID:20240522T1454Z-1716389652.5219-EO-14599-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20240513T143637Z LAST-MODIFIED:20240513T143637Z DTSTART;TZID=Europe/Berlin:20240524T110000 DTEND;TZID=Europe/Berlin:20240524T123000 SUMMARY: MPIfR/AIfA Main Colloquium\, Speaker: Prof. Heinz Andernach\, Thür inger Landessternwarte\, Tautenburg\, Germany\, on leave from University of Guanajuato\, Mexico DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium Titel: Giant Radio Galaxies at 50: With Ten T housand known we are not a bit wiser? Speaker: Prof. Heinz Andernach\, Thür inger Landessternwarte\, Tautenburg\, Germany\, on leave from University of Guanajuato\, Mexico Giant Radio Galaxies (GRGs) with a projected linear ex tent over 1 Mpc were first […] X-ALT-DESC;FMTTYPE=text/html:

    Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium

    Ti tel: Giant Radio Galaxies at 50: With Ten Thousand known we are not a bit w iser?

    Speaker: Prof. Heinz Andernach\, Thüringer Landessternwarte\, T autenburg\, Germany\, on leave from University of Guanajuato\, Mexico

    Giant Radio Galaxies (GRGs) with a projected linear extent over 1 Mpc were first found in 1974\, and over 5\,000 are now known\, plus another 5\,000 larger than 0.7 Mpc\, the currently adopted threshold for GRGs. I present r esults based on my compilation of GRGs (a) from literature\, and my own vis ual inspection of (b) large-scale radio surveys in general (e.g. NVSS\, SUM SS\, RACS\, LoTSS DR2\, etc.)\, and of specific regions like (c) the LoTSS Deep Fields (LDF)\, as well as (d) the equatorial SWAG-X/eFEDS/LOFAR field. Although very time-consuming\, systematic visual inspection clearly provid es a higher ratio of GRGs <1 Mpc to those >1 Mpc than literature samples\, which tend to disfavor smaller GRGs. I also show examples of published mis- identifications based on automated algorithms\, lacking the necessary human control of the results. In order to shed light on the open question why GR Gs can reach their large sizes\, I look at (a) their location as function o f environment density in the LDF and SWAG-X fields\, and (b) I select the v ery largest 115 GRGs (from 3 to 6.6 Mpc)\, to study how they were discovere d (mostly by LOFAR)\, their distribution in redshift and radio luminosity\, and their bending angle\, and compare these with GRGs of more modest sizes .

    CATEGORIES:Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mpifraifa-m ain-colloquium-speaker-prof-heinz-andernach-thuringer-landessternwarte-taut enburg-germany-on-leave-from-university-of-guanajuato-mexico/ END:VEVENT BEGIN:VEVENT UID:20240502T0257Z-1714618646.797-EO-14593-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20240429T115953Z LAST-MODIFIED:20240429T115953Z DTSTART;TZID=Europe/Berlin:20240604T140000 DTEND;TZID=Europe/Berlin:20240604T160000 SUMMARY: Workshop: “How to apply for Marie Curie fellowships” DESCRIPTION: We are offering\, in cooperation with the EU-Office of the Fed eral Ministry of Education and Research (BMBF)\, a career development semin ar directed to early stage researchers (PhD and postdoctoral level):   „How to apply for Marie Curie fellowships“.    The well-established and very pr estigious Marie-Skłodowska-Curie (MSCA) programme enables young postdocs (u p to 8 years full time equivalent experience in research after […] X-ALT-DESC;FMTTYPE=text/html:
    We are offering\, in cooperation with the EU-Office of the Federal Ministr y of Education and Research (BMBF)\, a career development seminar directed to early stage researchers (PhD and postdoctoral level):
    < span style="font-family: HelveticaNeue"> 

    „How to apply for Mar ie Curie fellowships“. 

     
    The well-established and very prestigious Marie-Skłodowska-Curie (MS CA) programme enables young postdocs (up to 8 years full time equivalent ex perience in research after PhD) to carry out a project of their choice at a research institution and / or company. They can do this within the EU or a t an internationally renowned institute outside the EU (More information on the current call can be found here).
    < div> 
    In preparation for the next deadline\, which expires on 11 September 2024\, t he following topics will be addressed:
     
    Part 1:  Stef anie Odermatt (National Contact Point Marie Skłodowska-Curie\, DLR Projektträger)
     
    - Marie Skłodowska-Cur ie Individual Fellowships: what is it all about?
    * What and for whom are MC Fellowsh ips? 
    * Rules 
    - How to write a s uccessful application to the MSCA?
     
    Part 2: Evaluation and applicatio n – experiences of a reviewer. Dr. Rainer Mauersberger (MPI für Radi oastronomie) 
     

    - Select ion criteria and how to address them. 

    CATEGORIES:Softskills ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/workshop-ho w-to-apply-for-marie-curie-fellowships/ END:VEVENT BEGIN:VEVENT UID:20240209T2039Z-1707511194.3913-EO-14545-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20240209T153833Z LAST-MODIFIED:20240605T150207Z DTSTART;TZID=Europe/Berlin:20240607T110000 DTEND;TZID=Europe/Berlin:20240607T123000 SUMMARY: CANCELED — CANCELED — CANCELED — CANCELED MPIfR/AIfA Main Colloqui um\, Speaker: Prof. Dr. Leon Koopmans\, Groningen University DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium We are sorry to announce that this colloquium has been CANCELED -- CANCELED -- CANCELED -- CANCELED -- CANCELED -- CANCE LED Titel: Observing the Epoch of Reionisation and Cosmic Dawn with LOFAR a nd NenuFAR\, and the upcoming SKA Speaker: Prof. Dr. Leon Koopmans\, Gronin gen University […] X-ALT-DESC;FMTTYPE=text/html:

    Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium

    We are sorry to announce that this colloquium has bee
 nCANCELED -- CANCELED -- CANCELED -- CANCELED -- CANCELED -- CANCELED

    Titel: Observing the Epoch of Reionisation and Cosmic Dawn with LOFAR an d NenuFAR\, and the upcoming SKA

    Speaker: Prof. Dr. Leon Koopmans\, G roningen University

    Observations of the first luminous cosmic structu res\, with ground and space-based optical and infrared telescopes\, are slo wly lifting the veil on the complex physical processes that governed the Ep och of Reionization and Cosmic Dawn. These observations\, most recently wit h JWST reaching redshift well into the Cosmic Dawn\, however\, are only the tip of the iceberg: islands in a sea of neutral hydrogen. I will review th e current status of the LOFAR Epoch of Reionization Key-Science Program\, p resenting our latest improved power-spectrum limits on the 21-cm signal of neutral hydrogen\, the constraints it sets on the high-redshift IGM\, and p resent several breakthroughs in our understanding of the data itself\, whic h will be crucial for the future SKA. I will also show the latest results f rom the NenuFAR Cosmic Dawn Key-Science Program\, which aims to measure the 21-cm signal during the Cosmic Dawn. I will place these results in context of SKA and our plans to push towards 21-cm cosmology of the Dark Ages usin g space-based receivers\, such as ALO\, currently a pre-phase-A concept for a radio telescope to be placed on the lunar farside by ESA's Argonaut land ers.

    CATEGORIES:Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mpifraifa-m ain-colloquium-speaker-prof-dr-leon-koopmans-groningen-university/ END:VEVENT BEGIN:VEVENT UID:20240602T1432Z-1717338734.9881-EO-14606-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20240529T135024Z LAST-MODIFIED:20240529T135024Z DTSTART;TZID=Europe/Berlin:20240614T110000 DTEND;TZID=Europe/Berlin:20240614T123000 SUMMARY: MPIfR/AIfA Main Colloquium\, Speaker: Dr. Sergei Tsygankov DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium Titel: Polarized emission from accreting neut ron stars as seen by the IXPE observatory Speaker: Dr. Sergei Tsygankov\, T urku University Analysis of the polarization of electromagnetic radiation\, or polarimetry\, is a unique tool that allows us to obtain information abo ut astrophysical objects that cannot be obtained […] X-ALT-DESC;FMTTYPE=text/html:

    Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium

    Ti tel: Polarized emission from accreting neutron stars as seen by the IXPE ob servatory

    Speaker: Dr. Sergei Tsygankov\, Turku University

    Anal ysis of the polarization of electromagnetic radiation\, or polarimetry\, is a unique tool that allows us to obtain information about astrophysical obj ects that cannot be obtained in other ways\, for example\, regarding their geometry. With the launch of the IXPE (Imaging X-ray Polarimetry Explorer) mission at the end of 2021\, this instrument became available in the X-ray range as well. In my talk I will give a brief overview of the results obtai ned during the first two years of IXPE observations of accreting neutron st ars\, mainly focusing on the highly magnetised ones (X-ray pulsars\, XRPs). It was found that in all observed XRPs\, the measured value of the degree of polarization is below 15%\, which is much less than the theoretically pr edicted values. In some pulsars\, it was possible to study in detail the va riations in the degree of polarization and the polarization angle as a func tion of the rotation phase of the neutron star\, which\, in turn\, made it possible to determine the geometric parameters of the system. I will discus s the physical mechanisms that could potentially explain the unexpected pol arization properties observed in XRPs.

    CATEGORIES:Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mpifraifa-m ain-colloquium-speaker-dr-sergei-tsygankov/ END:VEVENT BEGIN:VEVENT UID:20240522T1454Z-1716389652.5404-EO-14600-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20240513T144517Z LAST-MODIFIED:20240513T144517Z DTSTART;TZID=Europe/Berlin:20240620T120000 DTEND;TZID=Europe/Berlin:20240620T130000 SUMMARY: PhD colloquium: Jonah Wagenveld DESCRIPTION: PhD colloquium\, location: Auditorium 0.02\, MPIfR Jonah Wagen veld Title: Testing large scale cosmology with MeerKAT The cosmic radio dip ole is an anisotropy in the number counts of radio sources\, analogous to t he dipole seen in the cosmic microwave background (CMB). Measurements of th e radio dipole with large radio surveys have shown that though the radio di pole […] X-ALT-DESC;FMTTYPE=text/html:

    PhD colloquium\, location: Auditorium 0.02 \, MPIfR

    Jonah Wagenveld

    Title: Testing large scale cos mology with MeerKAT

    The cosmic radio dipole is an anisotropy in the number counts of radio sources\, analogous to the dipole seen in th e cosmic microwave background (CMB). Measurements of the radio dipole with large radio surveys have shown that though the radio dipole is aligned in d irection with the CMB dipole\, the amplitudes are in tension. These observa tions present an intriguing puzzle as to the cause of this discrepancy\, wi th a true anisotropy having large repercussions for cosmology as a whole. M easurements of the cosmic radio dipole with large radio surveys have often suffered from systematics in the data\, hampering sensitivity and reliabili ty of these measurements. In this thesis\, I aim to measure the cosmic radi o dipole with the MeerKAT Absorption Line Survey (MALS). Though sky coverag e of MALS is low\, with 391 pointings observed in total\, the sensitivity a nd field of view of MeerKAT yields thousands of sources observed in each po inting. We perform a deep analysis of the complete set of processing steps\ , from observations to cataloguing\, of ten MALS pointings\, to characteris e and quantify potential systematic effects which could hamper a dipole mea surement. Using the noise characteristics of these pointings\, we find that we can homogenise the catalogues to a deep enough level for a dipole measu rement. We furthermore define Bayesian estimators that are able to perform a dipole measurement with the sparse sky coverage of MALS. Testing these es timators out on other radio surveys\, we perform the most significant measu rement of the cosmic radio dipole yet. Finally\, we perform a measurement o f the dipole using all MALS pointings\, but find an effect in the data whic h causes a systematic variation in source density with declination\, hamper ing a dipole measurement. Though we can account for the effect by extending our estimators\, it comes at the cost of further uncertainties\, which can only be remedied by reprocessing the data. However\, combined with other m easurements performed in this thesis and in the literature\, there is a lit tle doubt anymore as to the legitimacy of the radio dipole measurement\, an d we may look forward to further measurements which aim to uncover the caus e of the dipole tension.

    CATEGORIES:Thesis Defense ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/phd-colloqu ium-jonah-wagenveld/ END:VEVENT BEGIN:VEVENT UID:20240621T1004Z-1718964251.4376-EO-14617-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20240620T140212Z LAST-MODIFIED:20240620T140212Z DTSTART;TZID=Europe/Berlin:20240621T110000 DTEND;TZID=Europe/Berlin:20240621T123000 SUMMARY: MPIfR/AIfA Main Colloquium\, Speaker: Prof. Dr. Selma de Mink DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium Titel: It takes two to Tango – Stellar Physic s in the Era of Stellar\, Transient\, and Gravitational Wave Surveys Speake r: Prof. Dr. Selma de Mink\, MPA The majority of stars form in binary and m ultiple systems. To understand the lives and final fates of stars […] X-ALT-DESC;FMTTYPE=text/html:

    Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium

    Titel: It takes two to Tango - Stellar Physics in the Era of Stellar\, Transient\, and Gravitational Wave Surveys

    Speaker: Prof. Dr. Selma d e Mink\, MPA

    The majority of stars form in binary and multiple system s. To understand the lives and final fates of stars we need to understand h ow the presence of companions can affect their lives. This is especially tr ue for massive stars we think that the majority interact with its binary co mpanion and more than a fifth can even interact with the third star. These questions are especially timely now in the era of gravitational wave detect ions which are starting to reveal the properties binary black holes and neu tron stars. At the same time large stellar surveys\, in particular Gaia\, a re probing these multiple systems\, Tess and soon PLATO are uncovering stel lar oscillations that allow us go probe the interior of these stars\, time domain surveys catch the more dramatic events involving mergers\, disruptio ns and explosions. I like to discuss a few fun and possibly important new i nsights in massive (binary) stars that we have been pursuing at the new ste llar department at the Max Planck Institute for Astrophysics in Garching ne ar Munichm Germany. This will include a discussion of the claims that the R ed Supergiant Betelgeuse is rotating\, why the widest binaries are not bori ng at all\, the elusive stripped stars that were missing and have now been found and if time permits a discussion about Blue Supergiants.

    CATEGORIES:Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mpifraifa-m ain-colloquium-speaker-prof-dr-selma-de-mink/ END:VEVENT BEGIN:VEVENT UID:20240703T1557Z-1720022240.6703-EO-14621-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20240627T093535Z LAST-MODIFIED:20240627T093535Z DTSTART;TZID=Europe/Berlin:20240628T110000 DTEND;TZID=Europe/Berlin:20240628T123000 SUMMARY: MPIfR/AIfA Main Colloquium\, Speaker: Dr. Roberto Neri DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium Titel: NOEMA\, the Northern Extended Millimet er Array. Speaker: Dr. Roberto Neri\, IRAM Grenoble (France) NOEMA was desi gned and built to provide world-class observing capabilities to a global co mmunity of thousands of researchers. Equipped with twelve 15-meter antennas \, state-of-the-art receivers\, and baselines extending up to 1.7 […] X-ALT-DESC;FMTTYPE=text/html:

    Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium

    Titel: NOEMA\, the Northern Extended Millimeter Array.

    Speaker: D r. Roberto Neri\, IRAM Grenoble (France)

    NOEMA was designed and built to provide world-class observing capabilities to a global community of tho usands of researchers. Equipped with twelve 15-meter antennas\, state-of-th e-art receivers\, and baselines extending up to 1.7 kilometers\, NOEMA deli vers a comprehensive suite of capabilities. These features ensure that NOEM A remains at the forefront of astronomical research\, consistent with IRAM' s long-term development strategy. In my presentation\, I will outline NOEMA ’s current operational capabilities and the planned upgrades in the near fu ture. Additionally\, I will highlight some of the recent scientific discove ries and achievements facilitated by NOEMA.

    CATEGORIES:Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mpifraifa-m ain-colloquium-speaker-dr-roberto-neri/ END:VEVENT BEGIN:VEVENT UID:20240708T1631Z-1720456316.732-EO-14629-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20240708T125811Z LAST-MODIFIED:20240708T125811Z DTSTART;TZID=Europe/Berlin:20240710T140000 DTEND;TZID=Europe/Berlin:20240710T153000 SUMMARY: PhD colloquium: Tsan-Ming Wang DESCRIPTION: PhD colloquium\, location: Lecture Hall 0.02\, MPIfR\, Bonn Ta ns-Ming Wang “A census on the gas content of star-forming galaxies over the past 11 billion years of the universe” Abstract: With the advent of the At acama Large Millimeter/submillimeter Array (ALMA)\, we now have the opportu nity to measure the physical properties of the cold\, dense\, star-forming interstellar medium […] X-ALT-DESC;FMTTYPE=text/html:

    PhD colloquium\, location: Lecture Hall 0. 02\, MPIfR\, Bonn

    Tans-Ming Wang

    “A census on the gas c ontent of star-forming galaxies over the past 11 billion years of the unive rse”

    Abstract:

    With the advent of the Atacama Large Millimeter/submillimeter Array (ALMA)\, we now have the oppo rtunity to measure the physical properties of the cold\, dense\, star-formi ng interstellar medium (ISM) even in distant\, high-redshift galaxies. This dissertation documents measurements of the mean molecular gas mass\, M gas\, and apparent size of star-forming galaxies (SFGs) at different c osmological epochs\, for galaxies over a wide range of total stellar mass\, M★\, and in different star formation modes\, normal vs. starburst . This contributes to constrain the physical mechanisms that regulate star formation throughout cosmic history. It has been known that most of the SFG s follow a tight correlation between total star formation rate and total st ellar mass\, the so-called main sequence (MS) of SFGs. I selected a sample of mass-complete MS galaxies and measured their mean Mgas and size using a Fourier-domain stacking analysis. Based on the measurements\, I de termined the mean molecular gas fraction\, Mgas/M★\, and the mean molecular gas depletion time\, Mgas/ star formation rate (SFR)\, of these SFGs. I found that MS galaxies exhibit a constant mean mol ecular gas depletion time of ~400 million years over cosmic time\, while th eir mean molecular gas fraction decreases by a factor of ~24 over the past 11 billion years. These findings suggest that cold gas must be continuously accreted to MS galaxies from the cosmic web to sustain star formation on t imescales of giga-years\, and that the evolution of MS galaxies is predomin antly regulated by variations in their gas content. The mean gas sizes of M S galaxies remain constant (~2.2 kpc) across all stellar masses and through out cosmic time\, which is smaller than the mean size of their monochromati c optical emissions\, but similar to the mean size of their stellar mass di stributions. This suggests negative radial gradient of the dust attenuation in MS galaxies. By integrating the gas mass\, size\, and star formation ra te of MS galaxies\, I investigated the relation between their gas mass surf ace density and the SFR surface density\, known as the Kennicutt-Schmidt re lation. An universal slope of ~1.13 in log-space across cosmic time is foun d\, which implies that the increase in mean molecular gas depletion time of observed over the past 11 Gyr is due to a decrease in the gas surface dens ity. On the origin of a ~0.3 dex scatter in the SFR on the MS at a given re dshift and M★\, I found that SFGs located on the lower envelop of the MS have lower molecular gas fraction and longer depletion time\, while SFGs located on the upper envelope have higher gas mass fractions and short er depletion time. This suggests that small variations in the SFR of SFGs d uring their long-term evolution within the MS are regulated by disturbances acting on short timescales\, such as minor mergers and violent disk instab ilities. At any redshift and total stellar mass\, a subset of SFGs have sta r formation rates of more than a factor of three higher than those of MS ga laxies. These are the so-called starburst galaxies\, which I have found to exhibit complex optical morphologies indicative of merger events that appea r as infall of gas into deeper gravitational potentials\, as evidenced by m ore compact gas sizes (~1.4 kpc). This infalling gas scenario is supported by my finding that starburst galaxies have larger molecular gas fractions t han MS galaxies\, because neutral hydrogen gas would lose its angular momen tum and fall into the deeper gravitational potentials\, transforming into a molecular phase.

    CATEGORIES:Thesis Defense ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/phd-colloqu ium-tsan-ming-wang/ END:VEVENT BEGIN:VEVENT UID:20240722T0626Z-1721629575.6737-EO-14641-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20240718T124448Z LAST-MODIFIED:20240719T113525Z DTSTART;TZID=Europe/Berlin:20240719T140000 DTEND;TZID=Europe/Berlin:20240719T153000 SUMMARY: LATER: 2pm – MPIfR/AIfA Main Colloquium\, Speaker: Dr. Nadine Neum ayer DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium Titel: The build-up of galactic nuclei: how d o black holes get there? Speaker: Dr. Nadine Neumayer\, Max-Planck-Institut für Astronomie\, Heidelberg The centers of massive galaxies are special in many ways\, not least because apparently all of them host supermassive bla ck holes. Since the discovery of […] X-ALT-DESC;FMTTYPE=text/html:

    Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium

    Ti tel: The build-up of galactic nuclei: how do black holes get there?

    S peaker: Dr. Nadine Neumayer\, Max-Planck-Institut für Astronomie\, Heidelbe rg

    The centers of massive galaxies are special in many ways\, not lea st because apparently all of them host supermassive black holes. Since the discovery of a number of relations linking the mass of this central black h ole to the large scale properties of the surrounding galaxy bulge it has be en suspected that the growth of the central black hole is intimately connec ted to the evolution of its host galaxy. However\, at lower masses\, and es pecially for bulgeless galaxies\, the situation is much less clear. Interes tingly\, these galaxies often host massive star clusters at their centers\, and unlike black holes\, these nuclear star clusters provide a visible rec ord of the accretion of stars and gas into the nucleus.

    I will presen t our ongoing observing programme of the nearest nuclear star clusters\, in cluding the Milky Way Center\, and the stripped galaxy nuclei omega Centaur i and M54. These observations provide important information on the formatio n mechanisms of nuclear star clusters\, allow us to measure potential black hole masses and give clues on how black holes get to the centers of galaxi es.

    CATEGORIES:Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mpifraifa-m ain-colloquium-speaker-dr-nadine-neumayer/ END:VEVENT BEGIN:VEVENT UID:20240615T0330Z-1718422257.4759-EO-14610-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20240613T125816Z LAST-MODIFIED:20240613T125816Z DTSTART;TZID=Europe/Berlin:20240822T130000 DTEND;TZID=Europe/Berlin:20240822T150000 SUMMARY: Webinar: Your PhD @ Max Planck- exploring doctoral programs: DESCRIPTION: Registration Deadline: August 20\, 2024 Your PhD @ Max Planck- exploring doctoral programs Webinar on August 22\, 2024 \, 1-3 pm (CEST) R egister here: https://events.gwdg.de/event/705/overview Are you a student e ager to explore the prospect of pursuing a doctoral degree in Germany? Join us for an event tailored to provide invaluable insights into the advantage s of obtaining […] X-ALT-DESC;FMTTYPE=text/html:

    Registration Deadline: August 20\, 2024

    Your PhD @ Max Planck- exploring doctoral programs

    Webinar o n August 22\, 2024 \, 1-3 pm (CEST)

    Register here: https://events.gwdg.de/event/705/overview

    Are you a student ea ger to explore the prospect of pursuing a doctoral degree in Germany?

    < p>Join us for an event tailored to provide invaluable insights into the adv antages of obtaining a PhD at the Max Planck Society as part of an Int ernational Max Planck Research School.

    Our webinar will commence with an overview session discussing PhD opportunities within the Max Planck Society\, with a specific focus on the offerings available at institutes l ocated in North Rhine-Westphalia (NRW)\, Germany.

    What to expect?

    🔍 Gain insights into exciting PhD opportunities at Max Planck institut es across North Rhine-Westphalia (NRW)\, Germany and learn about our resear ch and training opportunities!

    🔭 Discover groundbreaking research at IMPRS for Astronomy and Astrophysics in Bonn & Cologne.< /p>

    🧬 Unravel the mechanisms of ageing at the Cologne Gra duate School of Ageing Research.

    🧪 Dive into the world of biomole cular interactions with IMPRS for Living Matter in Dortmund.

    < p>🌿 Explore cutting-edge computational and evolutionary approaches at IMPRS for Understanding Complex Plant Traits in Cologne.

    🔩 For ge the future with IMPRS for Sustainable Metallurgy in Düsseldorf.

    CATEGORIES:Career event ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/webinar-you r-phd-max-planck-exploring-doctoral-programs/ END:VEVENT BEGIN:VEVENT UID:20240816T1006Z-1723802812.5523-EO-14675-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20240816T092817Z LAST-MODIFIED:20240816T092817Z DTSTART;TZID=Europe/Berlin:20240904T140000 DTEND;TZID=Europe/Berlin:20240904T160000 RRULE:FREQ=DAILY;INTERVAL=1;UNTIL=20240905T120000Z SUMMARY: Black Board Lectures by Prof. Mark Morris DESCRIPTION: Titel: Manifestations and Physics of Galactic Winds and Outflo ws by Prof. Mark Morris (UCLA Division of Astronomy &\; Astrophysics) W ednesday\, 4 September and Thursday\, 5 September 2024 at Max Planck Instit ute for Radio Astronomy (Auditorium 0.02) For details visit https://events. mpifr-bonn.mpg.de/indico/event/412/ X-ALT-DESC;FMTTYPE=text/html:

    Titel: Manifestations and Physics of Galactic Winds and Outflows
    by Prof. Mark Morris < /strong>(UCLA Division of Astronomy & Astrophysics)
    Wednesday\, 4 Sept ember and Thursday\, 5 September 2024
    at Max Planck Institute for Radi o Astronomy (Auditorium 0.02)

    For details visit https://events.mpifr-bonn.mpg.de/indico/event/412/

    CATEGORIES:Blackboard ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/black-board -lectures-by-prof-mark-morris/ END:VEVENT BEGIN:VEVENT UID:20240827T2005Z-1724789127.3854-EO-14686-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20240827T154349Z LAST-MODIFIED:20240827T154349Z DTSTART;TZID=Europe/Berlin:20240906T110000 DTEND;TZID=Europe/Berlin:20240906T123000 SUMMARY: MPIfR/AIfA Main Colloquium\, Speaker: Dr. Ramesh Bhat DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium Titel: A decade of Pulsar science with the Mu rchison Widefield Array Speaker: Dr. Ramesh Bhat\, Curtin University From t he first high-quality detections of Crab giant pulses at frequencies below 300 MHz using the early prototype system that was comprised of merely three tiles\, to recent […] X-ALT-DESC;FMTTYPE=text/html:

    Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium

    Titel: A decade of Pulsar science with the Murchison Widefield Array

    Speaker: Dr. Ramesh Bhat\, Curtin University

    From the first high- quality detections of Crab giant pulses at frequencies below 300 MHz using the early prototype system that was comprised of merely three tiles\, to re cent successful launch of an ambitious\, all-southern-sky pulsar survey usi ng the Phase II compact array\, pulsar science with the Murchison Widefield Array (MWA) has been through quite a long and exciting journey. Considerin g the highly non-traditional path dictated by the voltage capture system fo r high-time resolution science with the MWA\, and the enormous data managem ent\, processing and software development tasks involved in facilitating an d extracting science using such a capability\, this has been a significant step forward. I will present an overview of some key milestones\, highlight ing examples of new science they have enabled\, and commenting on the enorm ous science potential that can now be realized through ongoing large progra mmes such as the SMART (Southern-Sky MWA Rapid Two-meter) survey. I will al so briefly remark on the yet-untapped potential for the MWA to become a pow erful low-frequency monitoring telescope for pulsars and fast transients\, once geared up with a real-time beam-forming capability to support high tim e resolution science applications.

    CATEGORIES:Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mpifraifa-m ain-colloquium-speaker-dr-ramesh-bhat/ END:VEVENT BEGIN:VEVENT UID:20240910T1214Z-1725970447.7153-EO-14705-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20240909T094541Z LAST-MODIFIED:20240909T094541Z DTSTART;TZID=Europe/Berlin:20240909T120000 DTEND;TZID=Europe/Berlin:20240909T133000 SUMMARY: PhD colloquium: Petra Benke DESCRIPTION: PhD colloquium\, location: Ph1\, Cologne Petra Benke Multiwave length variability in active galactic nuclei jets and other VLBI studies Ab stract: Active galactic nuclei (AGN) jets are the most luminous and energet ic objects in the Universe\, with many open questions regarding their forma tion\, evolution and variability. In this talk\, we will take a closer and closer look into […] X-ALT-DESC;FMTTYPE=text/html:

    PhD colloquium\, location: Ph1\, Cologne

    Petra Benke

    Multiwavelength variability in active galact ic nuclei jets and other VLBI studies

    Abstract:

    Active galactic nuclei (AGN) jets are the most luminous and energetic objects in the Universe\, with many open questions regarding their formation\, evoluti on and variability. In this talk\, we will take a closer and closer look in to the parsec-scale structure of these objects\, using very-long-baseline i nterferometry (VLBI). I show first-light images from the 2.3 GHz monitoring of the TANAMI program\, the only VLBI monitoring targeting southern-sky AG N. The 2.3 GHz monitoring was established to provide quasi-simultaneous dat a of the parsec-scale jets for the Fermi LAT\, which lacks the resolution t o probe the central region of AGN. I will then discuss a multiwavelength st udy of a gamma-ray flaring blazar and a radio multi-frequency observation o f a nearby radio galaxy. Both of these shed light on jet variability and th e similar physical processes which play a part in it\, despite the two AGN being separated by billions of years of cosmic time.

    CATEGORIES:Thesis Defense ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/phd-colloqu ium-petra-benke/ END:VEVENT BEGIN:VEVENT UID:20240910T1214Z-1725970447.7423-EO-14706-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20240909T094906Z LAST-MODIFIED:20240909T094906Z DTSTART;TZID=Europe/Berlin:20240910T120000 DTEND;TZID=Europe/Berlin:20240910T133000 SUMMARY: PhD colloquium: Jan Röder DESCRIPTION: PhD colloquium\, location: Ph1\, Cologne Jan Röder Dynamics an d radiative processes of relativistic magnetized plasmas in active galactic nuclei Abstract: The heart of every galaxy in the universe is home to an a wesome monster: a supermassive black hole (SMBH). With masses millions to b illions of times that of our sun\, they are among the most powerful […] X-ALT-DESC;FMTTYPE=text/html:

    PhD colloquium\, location: Ph1\, Cologne

    Jan Röder

    Dynamics and radiative processes of relativist ic magnetized plasmas in active galactic nuclei

    Abstract:

    The heart of every galaxy in the universe is home to an awesome monster : a supermassive black hole (SMBH). With masses millions to billions of tim es that of our sun\, they are among the most powerful sources of energy in the Universe. They are surrounded by hot\, magnetized plasma\, some of whic h has the unfortunate fate of being accreted and swallowed by the black hol e. A small fraction\, however\, is rescued by magnetic fields – and is ejec ted thousands of light years into interstellar space\, in the form of highl y collimated relativistic jets. Such an SMBH-powered system is known as an active galactic nucleus (AGN). Altough AGN have been the subject of active research for almost a century\, many aspects of their inner workings remain obscure. In my PhD thesis\, I addressed three specific questions\, ranging from the very vicinity an SMBH to the far extended jets of AGN: What is th e nature of the SMBH at the center of the Milky Way? What is the origin of the observed gamma-ray emission from AGN\, and specifically the quasar 3C34 5? And lastly\, how general is our is our established description of AGN as a whole? I have tackled these questions from both an observer's side\, usi ng very long baseline interferometry (VLBI) observations of AGN\, and from a theorist's side - using general-relativistic hydrodynamics (GRMHD) simula tions of exotic black holes and their surroundings. Zoom passcode: 3C345

    CATEGORIES:Thesis Defense ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/phd-colloqu ium-jan-roder/ END:VEVENT BEGIN:VEVENT UID:20240922T1311Z-1727010709.6581-EO-14751-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20240920T083855Z LAST-MODIFIED:20240920T083855Z DTSTART;TZID=Europe/Berlin:20240920T110000 DTEND;TZID=Europe/Berlin:20240920T120000 SUMMARY: MPIfR/AIfA Main Colloquium\, Speaker: Prof. You-Hua Chu DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium Titel: Supernova Remnants in 30 Doradus Speak er: Prof. You-Hua Chu\, University of Illinois 30 Dor is the nearest archet ypal giant HII region. Early low-resolution radio maps of 30 Dor region sho w three peaks that are designated as A\, B\, and C components. The A compon ent […] X-ALT-DESC;FMTTYPE=text/html:

    Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium

    Titel: Supernova Remnants in 30 Doradus

    Speaker: Prof. You-Hua Ch u\, University of Illinois

    30 Dor is the near
 est archetypal giant HII region.  Early low-resolution  radio maps of 30 Do
 r region show three peaks that are designated as   A\, B\, and C components
 .  The A component is the main body of the  30 Dor giant HII region with th
 e R136 cluster at its core\, the B component  hosts the OB association LH99
  and a known supernova remnant (SNR)\,   and the C component is a superbubb
 le around the OB association LH90.  The main component of 30 Dor is a brigh
 t source of diffuse X-ray emission  but no SNRs have been identified and co
 nfirmed.  Using archival HST images\,  deep Chandra X-ray observations\, an
 d ASKAP and MeerKAT radio observations\,  we are able to identify and confi
 rm a SNR in 30 Dor A and identify shocked   cloudlets in 30 Dor B.  SNRs in
  30 Dor are difficult to identify and confirm\, but   their influence is pr
 evalent and obvious.
    CATEGORIES:Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mpifraifa-m ain-colloquium-speaker-prof-you-hua-chu/ END:VEVENT BEGIN:VEVENT UID:20240917T1450Z-1726584602.9464-EO-14747-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20240916T173028Z LAST-MODIFIED:20240916T173028Z DTSTART;TZID=Europe/Berlin:20240920T140000 DTEND;TZID=Europe/Berlin:20240920T160000 SUMMARY: Reminiscence from the Lindau Nobel Laureate Meeting (Physics) 2024 DESCRIPTION: Speakers: Dr. Anne-Kathrin Baczko (Chalmers)\, Dr. Arshia Mari a Jacob (MPIfR)\, Prachi Prajapati (UoC\, Cologne)\, Dr. Isabella Rammala ( MPIfR)\, Dr. Arman Tursunov (Max Planck Institute for Radio Astronomy)\, An gie Veronica (AIfA). The Lindau Nobel Laureate Meetings\, established in 19 51\, offer a globally recognized platform for exchange between Nobel Laurea tes and young scientists. These meetings inspire scientific generations […] X-ALT-DESC;FMTTYPE=text/html:

    Speakers:

    • Dr. Anne-Kathrin Bacz ko (Chalmers)\,
    • Dr. Arshia Maria Jacob (MPIfR)\,
    • Prachi Pra japati (UoC\, Cologne)\,
    • Dr. Isabella Rammala (MPIfR)\,
    • Dr. Arman Tursunov (Max Planck Institute for Radio Astronomy)\,
    • Angie Veronica (AIfA).

    The Lindau Nobel Laureate Meetings\, establish ed in 1951\, offer a globally recognized platform for exchange between Nobe l Laureates and young scientists. These meetings inspire scientific generat ions and foster sustainable networks of young scientists worldwide. Held an nually\, the meetings alternate their disciplinary focus each year. The 73r d Lindau Nobel Laureate Meeting (LINO24) held over the first week of July\, 2024\, focused on Physics. We aim to discuss the application/nomination pr ocess and share insights and stories from LINO24. Welcoming this opportunit y\, we look forward to dedicating ample time for discussions.

    CATEGORIES:IMPRS ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/reminiscenc e-from-the-lindau-nobel-laureate-meeting-physics-2024/ END:VEVENT BEGIN:VEVENT UID:20240722T0626Z-1721629575.7149-EO-14644-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20240719T120728Z LAST-MODIFIED:20240719T120728Z DTSTART;TZID=Europe/Berlin:20241001T120000 DTEND;TZID=Europe/Berlin:20241001T200000 SUMMARY: IMPRS Excursion to Effelsberg DESCRIPTION: Visit of the Effelsberg observatory including observing demons tration and guided tour of the facility. Registration is open. X-ALT-DESC;FMTTYPE=text/html:

    Visit of the Effelsberg observatory includ ing observing demonstration and guided tour of the facility. Registration i s open.

    CATEGORIES:Excursion ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/imprs-excur sion-to-effelsberg/ END:VEVENT BEGIN:VEVENT UID:20241002T2350Z-1727913023.2031-EO-14755-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20241001T085341Z LAST-MODIFIED:20241010T142121Z DTSTART;TZID=Europe/Berlin:20241016T110000 DTEND;TZID=Europe/Berlin:20241016T123000 SUMMARY: Cancelled: MPIfR/AIfA Main Colloquium\, Speaker: Dr. Simon Ellings en DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium +++ Please note that this Main Colloquium tak es place on a Wednesday to accommodate the speaker +++ Titel: Science with shadow puppets and rainbows: Methanol Masers near (and not so near) Speaker : Dr. Simon Ellingsen\, University of Tasmania\, Australia Methanol is one of the most […] X-ALT-DESC;FMTTYPE=text/html:

    Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium

    +++ Please note that this Main Colloquium takes place on a Wednesda y to accommodate the speaker +++

    Titel: Science with shadow pupp ets and rainbows: Methanol Masers near (and not so near)

    Speaker: Dr. Simon Ellingsen\, University of Tasmania\, Australia

    Methanol is one of the most common molecules in the interstellar medium and I will give an overview of how methanol masers are being used to study the structure of t he Milky Way and the physics of starbursts. Astrometric measurements of int erstellar masers represent the most accurate way of determining the scale a nd structure of the Milky Way. Over the last 15 years significant progress has been made in measuring the number and location of Milky Way spiral arms in the northern hemisphere. Collecting equivalent data for the southern he misphere has been very slow\, primarily due to differences in available inf rastructure. I will present some new results for 6.7 GHz methanol masers fr om the southern hemisphere made as part of the Sprals project. I will highl ight recent upgrades to hardware and development of new calibration techniq ues which have enabled this and their application in other astrometry and a strophysics applications. A decade ago the first extragalactic class I (col lisionally excited) methanol masers were detected in the nearby starburst g alaxy NGC253. This are not scaled-up or extreme versions of Galactic class I methanol masers\, but appear to trace regions where there are very large volumes of molecular gas undergoing low-velocity shocks. I will explain the prospects for using this new type of extragalactic maser to improve our un derstanding of early-stage starbursts.

    CATEGORIES:Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mpifraifa-m ain-colloquium-speaker-dr-simon-ellingsen/ END:VEVENT BEGIN:VEVENT UID:20240917T1450Z-1726584602.9728-EO-14748-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20240916T173404Z LAST-MODIFIED:20240916T173404Z DTSTART;TZID=Europe/Berlin:20241022T130000 DTEND;TZID=Europe/Berlin:20241022T150000 SUMMARY: PhD colloquium: Yaoting Yan DESCRIPTION: PhD colloquium\, location: Auditorium 0.02\, MPIfR Yaoting Yan The Influence of Stellar Objects onto the Interstellar Medium: Isotopic Co mpositions and Maser Lines My thesis investigates the influence of stellar objects onto the interstellar medium (ISM)\, following two lines of researc h\, determining isotope ratios over much of the Milky Way and observing int erstellar ammonia masers. Isotope abundance […] X-ALT-DESC;FMTTYPE=text/html:

    PhD colloquium\, location: Auditorium 0.02 \, MPIfR

    Yaoting Yan

    The Influence of Stellar Objects o nto the Interstellar Medium: Isotopic Compositions and Maser Lines

    My thesis investigates the influence of stellar objects onto the int erstellar medium (ISM)\, following two lines of research\, determining isot ope ratios over much of the Milky Way and observing interstellar ammonia ma sers. Isotope abundance ratios provide a powerful tool to probe stellar nuc leosynthesis\, to evaluate the composition of stellar ejecta and to constra in the chemical evolution of the Milky Way. Molecular maser lines are signp osts of star formation\, probing the excitation and kinematics of very comp act regions in the close environment of young stellar objects and providing useful targets for trigonometric parallax measurements. In the first part of this talk\, I will present our observations of the J = 2-1 and 3-2 rotat ional transitions of various rare isotopologic variants of carbon monosulfi de (CS)\, namely C33S\, C34S\, C36S\, 13CS\, 13C33S\, and 13C34S\, toward a large sample of 110 high-mass star-forming regions (HMSFRs) with the IRAM 30-meter telescope. With accurate distances obtained from trigonometric par allaxes\, we confirm the previously identified 12C/13C and 32S/34S gradient s as a function of Galactocentric distance. There is no 34S/33S gradient\, but ratios are well below the values commonly reported in earlier publicati ons. For the first time\, we report positive gradients of 32S/33S\, 34S/36S \, 33S/36S and 32S/36S in our Galaxy. The Galactic 12C/13C gradients derive d based on measurements of CN\, C18O\, and H2CO are in agreement with our r esults from C34S and indicate that chemical fractionation has little effect on 12C/13C ratios. The measured 34S/33S ratios as a function of Galactocen tric radius indicate that 33S has a nucleosynthesis origin similar to that 34S. Interstellar 34S/33S values near the solar neighborhood suggest that t he solar system ratio is\, as perhaps also the 18O/17O ratio\, peculiar. Ou r measurements support that 36S is a purely secondary nucleus\; however\, w e note that data for lines containing this isotope are still sparse\, parti cularly in the inner Galaxy. The predicted 12C/13C ratios from the latest G alactic chemical evolution (GCE) models are in good agreement with our resu lts\, while our 32S/34S and 32S/36S ratios show larger differences at large r Galactocentric distances. 32S/33S ratios show an offset across the entire inner 12 kpc of the Milky Way. All of this can serve as a guideline for fu rther refinements of GCE models. The rest parts of this talk I will focus o n ammonia (NH3) masers in our Galaxy. With the Effelsberg 100-m telescope\, we discovered widespread non-metastable NH3 maser emission toward 17 high mass star forming regions (HMSFRs) in the Milky Way. This doubles the numbe r of known non-metastable ammonia masers in our Galaxy. These maser lines a rise from energy levels between 342 K up and 1449 K above the ground state and this probe the hot dense immediate neighborhoods of newly formed stars. With our higher angular resolution interferometric measurements from the K arl G. Jansky Very Large Array (JVLA)\, we determined detailed locations fo r maser spots emitted in multiple non-stable transitions toward a variety o f regions. We greatly increase the number of detections in the Galaxy in al l the lines targeted. The detected maser spots are not resolved by our JVLA observations. Lower limits to the brightness temperature are >400 K and re ach values up to several 10^5 K\, manifesting the lines' maser nature. In v iew of the masers' velocity differences with respect to adjacent hot molecu lar cores and/or ultra-compact (UC) H II regions\, it is argued that all th e measured ammonia maser lines may be associated with shocks caused either by outflows or by the expansion of UCH II regions.

    CATEGORIES:Thesis Defense ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/phd-colloqu ium-yaoting-yan/ END:VEVENT BEGIN:VEVENT UID:20240621T1004Z-1718964251.4514-EO-14618-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20240620T140633Z LAST-MODIFIED:20240620T140633Z DTSTART;TZID=Europe/Berlin:20241025T110000 DTEND;TZID=Europe/Berlin:20241025T123000 SUMMARY: MPIfR/AIfA Main Colloquium\, Speaker: Prof. Dr. Leon Koopmans DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium Titel: Observing the Epoch of Reionisation an d Cosmic Dawn with LOFAR and NenuFAR\, and the upcoming SKA Speaker: Prof. Dr. Leon Koopmans\, Groningen University Observations of the first luminous cosmic structures\, with ground and space-based optical and infrared teles copes\, are slowly lifting the veil on […] X-ALT-DESC;FMTTYPE=text/html:

    Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium

    Titel: Observing the Epoch of Reionisation and Cosmic Dawn with LOFAR a nd NenuFAR\, and the upcoming SKA

    Speaker: Prof. Dr. Leon Koopmans\, Groningen University

    Observations of the first luminous cosmic struct ures\, with ground and space-based optical and infrared telescopes\, are sl owly lifting the veil on the complex physical processes that governed the E poch of Reionization and Cosmic Dawn. These observations\, most recently wi th JWST reaching redshift well into the Cosmic Dawn\, however\, are only th e tip of the iceberg: islands in a sea of neutral hydrogen. I will review t he current status of the LOFAR Epoch of Reionization Key-Science Program\, presenting our latest improved power-spectrum limits on the 21-cm signal of neutral hydrogen\, the constraints it sets on the high-redshift IGM\, and present several breakthroughs in our understanding of the data itself\, whi ch will be crucial for the future SKA. I will also show the latest results from the NenuFAR Cosmic Dawn Key-Science Program\, which aims to measure th e 21-cm signal during the Cosmic Dawn. I will place these results in contex t of SKA and our plans to push towards 21-cm cosmology of the Dark Ages usi ng space-based receivers\, such as ALO\, currently a pre-phase-A concept fo r a radio telescope to be placed on the lunar farside by ESA's Argonaut lan ders.

    CATEGORIES:Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mpifraifa-m ain-colloquium-speaker-prof-dr-leon-koopmans/ END:VEVENT BEGIN:VEVENT UID:20241105T2107Z-1730840864.0361-EO-14780-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20241105T105319Z LAST-MODIFIED:20241105T105319Z DTSTART;TZID=Europe/Berlin:20241108T110000 DTEND;TZID=Europe/Berlin:20241108T130000 SUMMARY: MPIfR/AIfA Main Colloquium\, Speaker: Dr. Timothy Davies DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium Titel: Tracing out the darkness with cold gas : dynamically probing galaxy evolution and black holes Speaker: Dr. Timothy Davies\, Cardiff University In this talk I will describe how mapping the d ynamics of gas clouds in the centre of galaxies can help us to constrain a […] X-ALT-DESC;FMTTYPE=text/html:

    Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium

    Ti tel: Tracing out the darkness with cold gas: dynamically probing galaxy evo lution and black holes

    Speaker: Dr. Timothy Davies\, Cardiff Universi ty

    In this talk I will describe how mapping the dynamics of gas cloud s in the centre of galaxies can help us to constrain a wide range of astrop hysical problems. From the enigmatic relation between galaxies and their su permassive black holes\, to the suppression of star-formation in dying gala xies\, the dynamics of cold gas provides an ideal probe that can help us ma ke progress. I will show how parsec resolution ALMA observations can be use d to estimate the masses of supermassive black holes in galaxies across the Hubble sequence\, both dynamically\, and via the newly discovered ‘fundame ntal plane of black hole accretion in the millimetre”. I will describe the WISDOM and WONDER projects\, that aims to use this technique to constrain t he importance of accreting SMBHs in galaxy quenching. I will go on to show that\, contrary to expectations\, molecular gas appears to be an important source of fuel for accretion in even low-luminosity\, low-excitation active SMBHs. Finally\, I will show that the deep potential wells of massive gala xies change the small-scale structure of the ISM\, suppressing star formati on\, and helping to keep bulge-dominated objects quenched.

    CATEGORIES:Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mpifraifa-m ain-colloquium-speaker-dr-timothy-davies/ END:VEVENT BEGIN:VEVENT UID:20241115T1218Z-1731673108.9058-EO-14787-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20241114T111758Z LAST-MODIFIED:20241114T111758Z DTSTART;TZID=Europe/Berlin:20241122T110000 DTEND;TZID=Europe/Berlin:20241122T123000 SUMMARY: MPIfR/AIfA Main Colloquium\, Speaker: Dr. Sebastian Bocquet DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium Titel: New Constraints on Cosmology from the Large-Scale Structure of the Universe Speaker: Dr. Sebastian Bocquet\, LMU With the latest generation of cosmological datasets\, we are accessing an u nprecedented wealth of information on the geometry and expansion of the uni verse and on the growth of […] X-ALT-DESC;FMTTYPE=text/html:

    Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium

    Ti tel: New Constraints on Cosmology from the Large-Scale Structure of the Uni verse

    Speaker: Dr. Sebastian Bocquet\, LMU

    With the latest gene ration of cosmological datasets\, we are accessing an unprecedented wealth of information on the geometry and expansion of the universe and on the gro wth of cosmic structure. This has allowed for tight constraints on\, e.g.\, the properties of neutrinos and dark energy\, but also uncovered anomalies such as the Hubble tension and the S8 tension. The abundance of galaxy clu sters\, the clustering of galaxies\, and weak gravitational lensing are key probes of the cosmic large-scale structure. Over the past decade\, tremend ous progress was made in obtaining high-precision measurements\, notably th anks to sensitive wide-field surveys of the cosmic microwave background (CM B) and of galaxies and gravitational lensing. Recently\, the abundance of c lusters selected in CMB data from the South Pole Telescope (SPT) — in combi nation with mass calibration based on weak-lensing data from the Dark Energ y Survey (DES) and the Hubble Space Telescope (HST) — was shown to be compa tible with and complementary to analyses of galaxy clustering and weak lens ing (3x2pt using\, e.g.\, DES data). In my talk\, I will review the SPT clu ster cosmology and mass calibration program. I will focus on the latest SPT + DES + HST analysis and discuss the resulting cosmological constraints. I will then present new results from the multiprobe analysis of SPT clusters and DES 3x2pt. The precision of these new constraints highlights the benef its of multiwavelength multiprobe cosmology and our work paves the way for upcoming joint analyses of next-generation datasets.

    CATEGORIES:Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mpifraifa-m ain-colloquium-speaker-dr-sebastian-bocquet/ END:VEVENT BEGIN:VEVENT UID:20241128T2047Z-1732826840.9246-EO-14789-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20241127T175041Z LAST-MODIFIED:20241127T175041Z DTSTART;TZID=Europe/Berlin:20241129T110000 DTEND;TZID=Europe/Berlin:20241129T123000 SUMMARY: MPIfR/AIfA Main Colloquium\, Speaker: Dr. Ioannis Liodakis DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium Titel: Understanding supermassive black holes through multiwavelength polarization Speaker: Dr. Yanis Liodakis\, Humbold t Fellow with Prof. Yuri Kovalev Supermassive black holes form the most int riguing astrophysical systems offering countless opportunities to study fun damental physics in regimes not accessible to laboratories on Earth. Their multimessenger emission […] X-ALT-DESC;FMTTYPE=text/html:

    Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium

    Ti tel: Understanding supermassive black holes through multiwavelength polariz ation

    Speaker: Dr. Yanis Liodakis\, Humboldt Fellow with Prof. Yuri K ovalev

    Supermassive black holes form the most intriguing astrophysica l systems offering countless opportunities to study fundamental physics in regimes not accessible to laboratories on Earth. Their multimessenger emiss ion manifests in the formation of accretion disks\, jets\, and the accelera tion of extremely energetic particles all of which are still poorly underst ood. Polarization can provide answers to long standing black hole physics q uestions. However\, the necessary instruments for such a task were\, until recently\, missing. I will discuss recent efforts to understand blazars and tidal disruption events through their polarized emission across the electr omagnetic spectrum.

    CATEGORIES:Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mpifraifa-m ain-colloquium-speaker-dr-ioannis-liodakis/ END:VEVENT BEGIN:VEVENT UID:20241115T1218Z-1731673108.9149-EO-14788-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20241114T112116Z LAST-MODIFIED:20241114T112116Z DTSTART;TZID=Europe/Berlin:20241206T110000 DTEND;TZID=Europe/Berlin:20241206T123000 SUMMARY: MPIfR/AIfA Main Colloquium\, Speaker: Dr. Giulia Illuminati DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium Titel: KM3NeT: expanding our knowledge of the Universe with neutrinos Speaker: Dr. Giulia Illuminati\, INFN-Bologna KM3N eT is the next-generation neutrino observatory currently under construction in the Mediterranean Sea\, already taking data in a partial configuration. By covering a vast energy range with its ARCA and […] X-ALT-DESC;FMTTYPE=text/html:

    Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium

    Ti tel: KM3NeT: expanding our knowledge of the Universe with neutrinos

    S peaker: Dr. Giulia Illuminati\, INFN-Bologna

    KM3NeT is the next-gener ation neutrino observatory currently under construction in the Mediterranea n Sea\, already taking data in a partial configuration. By covering a vast energy range with its ARCA and ORCA detectors\, KM3NeT can investigate a va riety of scientific topics\, including neutrino astronomy\, oscillation stu dies\, and dark matter searches. I will present the recent results in all t hese fields and discuss the exciting prospects KM3NeT offers for advancing our understanding of the cosmos and the fundamental properties of neutrinos .

    CATEGORIES:Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mpifraifa-m ain-colloquium-speaker-dr-giulia-illuminati-2/ END:VEVENT BEGIN:VEVENT UID:20240731T1914Z-1722453291.298-EO-14671-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20240730T141833Z LAST-MODIFIED:20240730T141833Z DTSTART;TZID=Europe/Berlin:20241211T100000 DTEND;TZID=Europe/Berlin:20241211T130000 SUMMARY: IMPRS A&A excursion to German Aerospace Centre in Cologne-Wahn DESCRIPTION: Visit of the German Aerospace Centre in Cologne Wahn. The foll owing institutes and facilities will be visited depending on availability: • European Astronaut Centre (ESA) • Microgravity User Support Center MUSC ( DLR) • Institute of Aerospace Medicine (DLR) • High-flux solar furnace\, In stitute of Future Fuels (DLR) X-ALT-DESC;FMTTYPE=text/html:

    Visit of the German Aerospace Centre in Co logne Wahn.

    The following institutes and facilities will be visited d epending on availability:
    • European Astronaut Centre (ES A)
    • Microgravity User Support Center MUSC (DLR)
    • Institute of Aeros pace Medicine (DLR)
    • High-flux solar furnace\, I nstitute of Future Fuels (DLR)

    CATEGORIES:Excursion ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/imprs-aa-ex cursion-to-german-aerospace-centre-in-cologne-wahn/ END:VEVENT BEGIN:VEVENT UID:20241215T1816Z-1734286598.8038-EO-14791-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20241213T125812Z LAST-MODIFIED:20241213T125812Z DTSTART;TZID=Europe/Berlin:20241213T140000 DTEND;TZID=Europe/Berlin:20241213T150000 SUMMARY: Meet the speaker of today’s Main Colloquium DESCRIPTION: Meet the speaker: Students and postdocs from all IMPRS A&\ ;A partner institutes are invited to have a discussion with Prof. Andreas Q uirrenbach (director at the Landessternwarte in Heidelberg)   X-ALT-DESC;FMTTYPE=text/html:

    Meet the speaker: Students and postdocs fr om all IMPRS A&A partner institutes are invited to have a discussion with

    Prof. Andreas Quirrenbach(director at 
 the Landessternwarte in Heidelberg)

     

    CATEGORIES:Career event ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/meet-the-sp eaker-of-todays-main-colloquium/ END:VEVENT BEGIN:VEVENT UID:20241215T1816Z-1734286598.9571-EO-14792-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20241213T131924Z LAST-MODIFIED:20241213T131924Z DTSTART;TZID=Europe/Berlin:20241220T100000 DTEND;TZID=Europe/Berlin:20241220T120000 SUMMARY: PhD colloquium: Angie Veronica DESCRIPTION: PhD colloquium\, location: Lecture hall 0.012\, AIfA Large-Sca le X-ray Studies of Nearby Galaxy Clusters with eROSITA Abstract: Galaxy cl usters form in the intersections of the cosmic web and grow through mergers and accretion of smaller substructures transported by the cosmic filaments . Hence\, the outskirts of galaxy clusters are of great significance for st udying the physics of […] X-ALT-DESC;FMTTYPE=text/html:

    PhD colloquium\, location: Lecture hall 0. 012\, AIfA

    Large-Scale X-ray Studies of Nearby Galaxy Clusters with eROSITA

    Abstract:
    Galaxy clusters form in the intersections of the cosmic web and grow through mergers and accretion of smaller substructu res transported by the cosmic filaments. Hence\, the outskirts of galaxy cl usters are of great significance for studying the physics of accretion proc esses (e.g.\, shocks and gas motions) and for detecting the elusive cosmic filaments. The cosmic filaments host the warm-hot intergalactic medium (WHI M) and tracing them helps locate the 40% unaccounted baryons in the local U niverse. Despite the importance\, studying cluster outskirts was hindered b y the lack of soft X-ray energy sensitivity and small field-of-views (FoVs) . The SRG/eROSITA instrument\, with its large FoV and superior soft X-ray s ensitivity\, enables detailed exploration of faint cluster outskirts and th e densest parts of filaments. This dissertation employs eROSITA data to inv estigate two cluster fields\, characterizing gas properties in their outski rts and filaments.
    The eROSITA PV data of the A3391/95 galaxy cluster system reveal a snapshot of large-scale structure formation\, revealing ~15 Mpc-long warm-hot emission connecting at least six clusters and groups. An alyses of cluster outskirts show elevated temperatures in filament-facing r egions\, driven by shocks from matter accretion. The detected filaments exh ibit temperatures slightly above the WHIM’s predicted upper limit\, likely due to enhanced gravitational heating in this dense environment.
    The C entaurus cluster\, one of the brightest and nearest clusters\, is an excell ent target for studying the outskirts of galaxy clusters. Previous research focused on the inner region of the cluster\, covering a radius of 30 arcmi n. However\, using data from the combined eROSITA all-sky survey (eRASS:5)\ , the spectral analysis has been extended to ~90 arcmin. The results indica te that\, while the core of the cluster is dynamically active\, the outskir ts remain largely undisturbed and show no influence from cosmic filaments.< /p>

     

    CATEGORIES:Thesis Defense ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/phd-colloqu ium-angie-veronica/ END:VEVENT BEGIN:VEVENT UID:20241215T1816Z-1734286598.9701-EO-14793-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20241213T133424Z LAST-MODIFIED:20241213T133424Z DTSTART;TZID=Europe/Berlin:20241220T110000 DTEND;TZID=Europe/Berlin:20241220T123000 SUMMARY: MPIfR/AIfA Main Colloquium\, Speaker: Dr. Markus Boettcher DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium Titel: TBD Speaker: Dr. Markus Boettcher\, No rth-West University\, Potchefstroom\, South Africa   X-ALT-DESC;FMTTYPE=text/html:

    Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium

    Ti tel: TBD

    Speaker: Dr. Markus Boettcher\, North-West University\, Potc hefstroom\, South Africa

     

    CATEGORIES:Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mpifraifa-m ain-colloquium-speaker-dr-markus-boettcher/ END:VEVENT BEGIN:VEVENT UID:20250117T0215Z-1737080114.0532-EO-14799-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20250116T190108Z LAST-MODIFIED:20250116T190108Z DTSTART;TZID=Europe/Berlin:20250124T110000 DTEND;TZID=Europe/Berlin:20250124T123000 SUMMARY: MPIfR/AIfA Main Colloquium\, Speaker: Dr. Fank Rieger DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium Titel: Active Galactic Nuclei as Cosmic Parti cle Accelerators Speaker: Dr. Frank Rieger\, IPP Accreting supermassive bla ck holes are believed to drive the energy output in the form of radiation a nd relativistic plasma outflows (jets) seen in active galactic nuclei (AGN) . As the most powerful\, persistent […] X-ALT-DESC;FMTTYPE=text/html:

    Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium

    Ti tel: Active Galactic Nuclei as Cosmic Particle Accelerators

    Speaker: Dr. Frank Rieger\, IPP

    Accreting supermassive black holes are believe d to drive the energy output in the form of radiation and relativistic plas ma outflows (jets) seen in active galactic nuclei (AGN). As the most powerf ul\, persistent sources in the Universe\, AGN provide a unique possibility to explore the realm of extreme physics. I will highlight some recent advan ces in the high-energy plasma diagnostics of these objects\, ranging from m agnetospheric processes in the vicinity of supermassive black holes to the physical characteristics of their large-scale jets. On black-hole horizon s cales\, for example\, gap-type particle acceleration is a likely mechanism behind the rapidly variable gamma-ray emission observed in sources such as M87\, and may supply the plasma necessary for continuous jet formation. On larger scales\, a combination of first and second-order Fermi-type accelera tion processes presumably plays a key role in shaping the non-thermal emiss ion properties of AGN jets. I will give an introduction to these scenarios\ , comment on their potential role for ultra-high energy cosmic-ray producti on\, and address some of the key challenges currently facing this field.

    CATEGORIES:Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mpifraifa-m ain-colloquium-speaker-dr-fank-rieger/ END:VEVENT BEGIN:VEVENT UID:20250117T0215Z-1737080114.072-EO-14800-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20250116T190444Z LAST-MODIFIED:20250116T190444Z DTSTART;TZID=Europe/Berlin:20250131T110000 DTEND;TZID=Europe/Berlin:20250131T123000 SUMMARY: MPIfR/AIfA Main Colloquium\, Speaker: Dr. Hannah Uebler DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium Titel: Recent results on massive black holes in the first few billion years Speaker: Dr. Hannah Uebler\, MPI for Extrate rrestrial Physics One of the most surprising results coming out of the firs t two years of science operations with JWST is the unexpectedly high abunda nce of […] X-ALT-DESC;FMTTYPE=text/html:

    Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium

    Ti tel: Recent results on massive black holes in the first few billion years

    Speaker: Dr. Hannah Uebler\, MPI for Extraterrestrial Physics

    On e of the most surprising results coming out of the first two years of scien ce operations with JWST is the unexpectedly high abundance of actively accr eting black holes in the early Universe. Compared to the local population\, many of these early black holes appear to differ in various aspects\, such as their relation to their host galaxies or their multi-wavelength propert ies. These observational findings challenge our understanding of the past e volution of present-day supermassive black holes\, and provide new ways to constrain theoretical models of black hole formation and growth. I will giv e an overview of recent observational results on massive black holes in the first few billion years and how they fit into current models\, largely dri ven by the unprecedented capabilities of JWST to explore cosmic dawn\, and with a focus on results from the NIRSpec GTO surveys JADES and GA-NIFS.

    CATEGORIES:Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mpifraifa-m ain-colloquium-speaker-dr-hannah-uebler/ END:VEVENT BEGIN:VEVENT UID:20250117T0215Z-1737080114.0788-EO-14801-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20250116T190715Z LAST-MODIFIED:20250116T190715Z DTSTART;TZID=Europe/Berlin:20250207T110000 DTEND;TZID=Europe/Berlin:20250207T123000 SUMMARY: MPIfR/AIfA Main Colloquium\, Speaker: Dr. Javier R. Goicoechea DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium Titel: Illuminating planet formation\, the ro le of external UV radiation in the chemistry of protoplanetary disks: new r esults from JWST and ALMA Speaker: Dr. Javier R. Goicoechea\, IFF-CSIC The earliest stages of (exo)planet formation takes place in protoplanetary disk s of gas and dust around young […] X-ALT-DESC;FMTTYPE=text/html:

    Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium

    Ti tel: Illuminating planet formation\, the role of external UV radiation in t he chemistry of protoplanetary disks: new results from JWST and ALMA

    Speaker: Dr. Javier R. Goicoechea\, IFF-CSIC

    The earliest stages of ( exo)planet formation takes place in protoplanetary disks of gas and dust ar ound young stars. It has become evident that the majority of these disks or iginate within a cluster of stars\, subjecting them to intense ultraviolet (UV) radiation. Despite its relevance to planet formation theories (our pro to-Solar System disk formed in a cluster) little is known about the role of this external UV radiation in the formation\, evolution\, and chemical com position of embryonic planetary systems. The unprecedented capabilities of JWST combined to ground based observatories such as ALMA now enables us to characterize protoplanetary disks irradiated by UV from the cluster.

    CATEGORIES:Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mpifraifa-m ain-colloquium-speaker-dr-javier-r-goicoechea/ END:VEVENT BEGIN:VEVENT UID:20250214T0235Z-1739500543.6142-EO-14807-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20250213T102104Z LAST-MODIFIED:20250213T102104Z DTSTART;TZID=Europe/Berlin:20250214T110000 DTEND;TZID=Europe/Berlin:20250214T123000 SUMMARY: MPIfR/AIfA Main Colloquium\, Speaker: Dr. Taro Shimizu\, MPE DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium\, location: Online Video Conference Titel: A New Era of Precision SMBH Mass Measurements with GRAVITY+ Speaker: Dr. Taro Shimizu\, MPE Near-infrared interferometry is a unique tool to study the i nner sub-parsec structure of AGN which is inaccessible with current single dish telescopes. With VLTI/GRAVITY\, we […] X-ALT-DESC;FMTTYPE=text/html:

    Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium\, location: Onlin e Video Conference

    Titel: A New Era of Precision SMBH Mass Measurements with GRAVITY+

    Speaker: Dr. Taro Shimizu\, MPE

    Near-infrared interferometry is a unique tool to study the inner sub-parse c structure of AGN which is inaccessible with current single
    dish tele scopes. With VLTI/GRAVITY\, we can now spatially resolve not just the hot d ust continuum on milliarcsecond scales through imaging
    but also the br oad-line region on microarcsecond scales through spectro-astrometry. In thi s talk\, I will review the latest results from
    our observations of loc al AGN with GRAVITY where we have mapped the kinematics of the BLR in seven nearby AGN\, measured sizes of the hot
    dust for sixteen AGN\, and rec onstructed images for two AGN. BLR kinematics have allowed us to independen tly measure the BLR size and
    supermassive black hole mass where we beg in to find a departure from the radius-luminosity relation at high luminosi ty. I will give an overview
    of the GRAVITY+ upgrades that will allow f or direct black hole mass measurements out to high redshift and therefore a precise tracing of
    supermassive black hole-galaxy coevolution through cosmic time. With the addition of wide-angle off-axis fringe tracking and a state-of-the-art
    AO system\, we have already pushed observations out to cosmic noon and beyond and I will show the first results and sample fro m this program.

    CATEGORIES:Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mpifraifa-m ain-colloquium-speaker-dr-taro-shimizu-mpe/ END:VEVENT BEGIN:VEVENT UID:20250319T1752Z-1742406765.6535-EO-14809-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20250317T105633Z LAST-MODIFIED:20250317T105634Z DTSTART;TZID=Europe/Berlin:20250321T110000 DTEND;TZID=Europe/Berlin:20250321T123000 SUMMARY: MPIfR/AIfA Main Colloquium\, Speaker: Prof. Naomi Ota DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium Titel: XRISM’s High-Resolution X-ray Spectros copy: Early Results on Galaxy Cluster Dynamics Speaker: Prof. Naomi Ota\, N ara Women’s University The XRISM satellite\, launched in 2023\, is the succ essor to Hitomi and marks a major step forward in high-resolution X-ray spe ctroscopy. Equipped with the microcalorimeter spectrometer Resolve\, […] X-ALT-DESC;FMTTYPE=text/html:

    Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium

    Ti tel: XRISM's High-Resolution X-ray Spectroscopy: Early Results on Galaxy Cl uster Dynamics

    Speaker: Prof. Naomi Ota\, Nara Women’s University

    The XRISM satellite\, launched in 2023\, is the successor to Hitomi and marks a major step forward in high-resolution X-ray spectroscopy. Equipped with the microcalorimeter spectrometer Resolve\, XRISM enables precise meas urements of gas motions and turbulence in galaxy clusters. In this talk\, I will present the initial results from XRISM observations of the A2029 gala xy cluster\, highlighting gas dynamics in the cluster core and the role of non-thermal pressure in the outer regions. I will also discuss future prosp ects\, including upcoming observational strategies and implications for gal axy cluster studies.

    CATEGORIES:Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mpifraifa-m ain-colloquium-speaker-prof-naomi-ota/ END:VEVENT BEGIN:VEVENT UID:20250319T1752Z-1742406765.7226-EO-14810-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20250317T110158Z LAST-MODIFIED:20250317T110158Z DTSTART;TZID=Europe/Berlin:20250404T110000 DTEND;TZID=Europe/Berlin:20250404T123000 SUMMARY: MPIfR/AIfA Main Colloquium\, Speaker: Dr. Patrick Reichherzer DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium Titel: Bridging Plasma Scales: Micro-to-Macro Coupling in Cosmic-Ray Propagation and Its Implications for Cluster Radio Morphologies Speaker: Dr. Patrick Reichherzer\, University of Oxford Galaxy clusters host a zoo of radio morphologies—from compact bubbles and extende d halos to sausages\, bridges\, and relics—all generated by cosmic rays […] X-ALT-DESC;FMTTYPE=text/html:

    Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium

    Ti tel: Bridging Plasma Scales: Micro-to-Macro Coupling in Cosmic-Ray Propagat ion and Its Implications for Cluster Radio Morphologies

    Speaker: Dr. Patrick Reichherzer\, University of Oxford

    Galaxy clusters host a zoo of radio morphologies—from compact bubbles and extended halos to sausages\ , bridges\, and relics—all generated by cosmic rays (CRs) interacting with magnetic fields. The transport of these CRs across galaxy clusters reflects a reciprocal interaction across plasma scales. Large-scale processes (≳kpc ) typically influence microscale behavior (~npc)\, but we show that microsc ale fluctuations—inherently patchy and intermittent in nature—shape large-s cale radio morphologies in galaxy clusters by mediating CR propagation. Thi s patchiness creates a heterogeneous medium where various plasma microinsta bilities collectively affect CR transport. Our multi-scale simulations (kin etic to MHD) show a scale-dependent diffusion coefficient\, with a transiti on at ~1–10 kpc: diffusion dominates below this scale\, while advection tak es over above it. This interplay shapes radio morphologies\, revealing that microscale physics significantly affects macroscopic CR transport. We reve al that microscale physics isn't just driven—it actively sculpts the radio sky\, offering testable predictions for next-generation observations.

    CATEGORIES:Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mpifraifa-m ain-colloquium-speaker-dr-patrick-reichherzer/ END:VEVENT BEGIN:VEVENT UID:20250503T0346Z-1746244008.4336-EO-14818-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20250424T111316Z LAST-MODIFIED:20250424T111316Z DTSTART;TZID=Europe/Berlin:20250425T110000 DTEND;TZID=Europe/Berlin:20250425T123000 SUMMARY: MPIfR/AIfA Main Colloquium\, Speaker: Dr. Reza Ayromlou DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium Titel: Galaxy Evolution Meets Large Scale Str ucture Speaker: Dr. Reza Ayromlou\, University of Bonn In this talk\, I wil l present an overview of my research into the interplay between galaxy evol ution and large-scale structure. I’ll delve into the effects of both intrin sic physical processes\, such […] X-ALT-DESC;FMTTYPE=text/html:

    Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium

    Ti tel: Galaxy Evolution Meets Large Scale Structure

    Speaker: Dr. Reza A yromlou\, University of Bonn

    In this talk\, I will present an overvie w of my research into the interplay between galaxy evolution and large-scal e structure. I'll delve into the effects of both intrinsic physical process es\, such as Supernova and AGN feedback\, and external environmental effect s on the evolution of galaxies and gas\, with a focus on large-scales. This includes theoretical studies based on simulations like L-Galaxies\, Illust risTNG\, EAGLE\, and SIMBA\, alongside observational data from SDSS\, DESI\ , and XMM-Newton\, among others. A central aspect will be understanding how feedback processes not only regulate star formation within galaxies but al so drive the redistribution of gas within and beyond dark matter halos\, re aching a newly identified characteristic scale called the Closure Radius. A dditionally\, I will explore how environmental processes influence galaxy a nd gas properties across various spatial scales. Finally\, I will discuss h ow the interplay between intrinsic and external processes can induce correl ations in galaxy properties from kiloparsec (kpc) to several megaparsec (Mp c) scales\, significantly exceeding the virial radii of even the largest ga laxy clusters—a phenomenon known as galactic conformity. Finally\, I highli ght critical pathways for future theoretical and observational studies aime d at unraveling the physical of galaxy formation and evolution across diffe rent scales.

    CATEGORIES:Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mpifraifa-m ain-colloquium-speaker-dr-reza-ayromlou/ END:VEVENT BEGIN:VEVENT UID:20250327T2037Z-1743107821.6144-EO-14812-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20250327T155338Z LAST-MODIFIED:20250327T155338Z DTSTART;TZID=Europe/Berlin:20250430T160000 DTEND;TZID=Europe/Berlin:20250430T173000 SUMMARY: PhD colloquium: Manali Jeste DESCRIPTION: PhD colloquium\, location: Auditorium 0.02\, MPIfR Manali Jest e Studies of the Envelopes of Evolved Stars using Millimetre and Submillime tre Spectroscopy Asymptotic giant branch (AGB) stars are low- to intermedia te-mass stars at the end of their life. At this stage of the stellar evolut ion\, these objects shed large amounts of matter in the form of gas and […] X-ALT-DESC;FMTTYPE=text/html:

    PhD colloquium\, location: Auditorium 0.02 \, MPIfR

    Manali Jeste

    Studies of the Envelopes of Evolv ed Stars using Millimetre and Submillimetre Spectroscopy

    Asy mptotic giant branch (AGB) stars are low- to intermediate-mass stars at the end of their life. At this stage of the stellar evolution\, these objects shed large amounts of matter in the form of gas and dust\, forming a circum stellar envelope around them and enriching the interstellar medium. In this talk\, I will present my thesis work where we probe these envelopes using carbon-bearing species\, the C atom\, and various molecules\, with observat ions from different single-dish telescopes. We use the rotational lines of the HCN molecule\, arising from its ground and vibrationally excited states \, to study the inner and hotter parts of the envelope\, whereas fine-struc ture lines of atomic and ionised carbon (C 0 and C + ) are used to constrai n their distribution in the envelope of the archetypal star\, IRC +10216. F urthermore\, we focus on AGB stars as a population and analyse 445 stars as part of the Nearby Evolved Stars Survey (NESS) collaboration. We observed transitions of the CO molecule from multiple rotational states to derive th eir physical parameters along with mass-loss rates. I will explore the stat istical distributions of the inferred stellar parameters and demonstrate ho w the statistical analysis of a stellar population confirms and extends our understanding of its contribution to the cosmic cycle of matter.

    CATEGORIES:Thesis Defense ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/phd-colloqu ium-manali-jeste/ END:VEVENT BEGIN:VEVENT UID:20250503T0346Z-1746244008.46-EO-14819-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20250430T152457Z LAST-MODIFIED:20250430T152457Z DTSTART;TZID=Europe/Berlin:20250506T130000 DTEND;TZID=Europe/Berlin:20250506T140000 SUMMARY: PhD colloquium: Lukas Neumann DESCRIPTION: PhD colloquium\, location: Lecture Hall 0.012\, AIfA Lukas Neu mann Dense Gas and Star Formation from the Milky Way to Nearby Galaxies Sta r formation lies at the heart of many astrophysical processes — from galaxy evolution to planet formation and the emergence of life — yet the process remains poorly understood. A key open question is whether […] X-ALT-DESC;FMTTYPE=text/html:

    PhD colloquium\, location: Lecture Hall 0. 012\, AIfA

    Lukas Neumann

    Dense Gas and Star Formation f rom the Milky Way to Nearby Galaxies

    Star formation lies a t the heart of many astrophysical processes — from galaxy evolution to plan et formation and the emergence of life — yet the process remains poorly und erstood. A key open question is whether star formation proceeds in a univer sal manner across galaxies or varies with environment. Addressing this requ ires studying the dense molecular gas that fuels star formation. With the a dvent of advanced radio facilities such as ALMA and IRAM\, it is now possib le to observe this dense\, cold\, immediate star-forming phase of the inter stellar medium in unprecedented detail.
    In this PhD de fence\, I will present results from the ALMOND survey\, the largest sample of dense gas observations in nearby star-forming galaxies\, combining ALMA data with multi-wavelength observations spanning ultraviolet\, optical\, in frared\, and radio frequencies. These data allow us to explore how the effi ciency of star formation varies across different galactic environments\, re vealing lower star formation efficiencies in high-density\, high-pressure r egions\, in agreement with predictions from turbulent cloud models.
    I will also discuss new observations of Milky Way clouds from the IRAM 30 m telescope\, which test the reliability of commonly used dens e gas tracers. Our results show that some tracers can also probe lower-dens ity gas\, raising questions about their robustness as dense gas tracers\, b ut still highlighting their continued value as tools for extragalactic stud ies.
    CATEGORIES:Thesis Defense ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/phd-colloqu ium-lukas-neumann/ END:VEVENT BEGIN:VEVENT UID:20250516T0627Z-1747376874.8999-EO-14821-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20250515T163400Z LAST-MODIFIED:20250515T163400Z DTSTART;TZID=Europe/Berlin:20250516T110000 DTEND;TZID=Europe/Berlin:20250516T123000 SUMMARY: MPIfR/AIfA Main Colloquium\, Speaker: Dr. Stella Ocker DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium Titel: The Electron Density Structure of the Milky Way Speaker: Dr. Stella Ocker\, Carnegie-Caltech Brinson Fellow The t ime has come for a new electron density model of the Milky Way. Galactic el ectron density models describe the multi-component\, multi-scale structure of the ionized interstellar medium (ISM). […] X-ALT-DESC;FMTTYPE=text/html:

    Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium

    Ti tel: The Electron Density Structure of the Milky Way

    Speaker: Dr. Ste lla Ocker\, Carnegie-Caltech Brinson Fellow

    The time has come for a n ew electron density model of the Milky Way. Galactic electron density model s describe the multi-component\, multi-scale structure of the ionized inter stellar medium (ISM). These models are routinely used to predict the distan ces of radio sources lacking independent distance measures\, in addition to forward modeling the dispersion and scattering of pulsars\, fast radio bur sts (FRBs)\, active galactic nuclei\, and masers. In this talk I will discu ss the developments motivating construction of a new electron density model \, and some key puzzles that face our understanding of multi-scale electron density structure in our Galaxy. Unlike previous models\, large-scale surv eys of the ionized ISM are being actively folded into the model constructio n. Specific case studies will be discussed to demonstrate how characterizat ion of the Galactic electron density affects our understanding of extragala ctic FRBs and their use as cosmic probes.

    CATEGORIES:Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mpifraifa-m ain-colloquium-speaker-dr-stella-ocker/ END:VEVENT BEGIN:VEVENT UID:20250516T0627Z-1747376874.9192-EO-14822-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20250515T163645Z LAST-MODIFIED:20250515T163645Z DTSTART;TZID=Europe/Berlin:20250523T110000 DTEND;TZID=Europe/Berlin:20250523T123000 SUMMARY: MPIfR/AIfA Main Colloquium\, Speaker: Prof. Jan Forbrich DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium Titel: Tuning into Star Formation: How Wideba nd Radio is Changing the Game Speaker: Prof. Jan Forbrich\, University of H ertfordshire What do young stars in Orion and giant molecular clouds in And romeda have in common? They are now both revealed in unprecedented detail t hanks to the […] X-ALT-DESC;FMTTYPE=text/html:

    Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium

    Ti tel: Tuning into Star Formation: How Wideband Radio is Changing the Game

    Speaker: Prof. Jan Forbrich\, University of Hertfordshire

    What do young stars in Orion and giant molecular clouds in Andromeda have in commo n? They are now both revealed in unprecedented detail thanks to the transfo rmative power of wideband upgrades to radio interferometry. Starting with t he VLA and VLBA upgrades and the advent of ALMA\, radio astronomy has enter ed a new era - soon to be propelled even further by the SKA and ngVLA\, and initiatives like ALMA2040. A key driver of this progress is the developmen t of wideband radio receivers\, dramatically enhancing continuum sensitivit y and enabling simultaneous spectral line observations. In this talk\, I wi ll showcase two examples of how these advances are reshaping star formation science. First\, focusing on nearby star formation\, I will present the Or ion Radio All-Stars\, illustrating how the upgraded VLA\, VLBA\, and ALMA a re revolutionizing our view of young radio stars in the Orion Nebula Cluste r - the closest region of high-mass star formation. For the first time\, we have detailed information on radio emission mechanisms and variability acr oss a large sample of young stellar objects. These observations provide cri tical new constraints on high-energy irradiation in protostellar environmen ts\, with implications for planet formation. Switching to nearby galaxies\, I will highlight the SMA Andromeda Dust and Molecular Gas Survey (SMA ADAM S)\, leveraging the wideband upgrade of the Submillimeter Array to observe the Andromeda Galaxy - the nearest large spiral galaxy. Dust continuum obse rvations are essential for characterizing molecular clouds\, and for the fi rst time\, we can now detect thermal dust emission from resolved individual Giant Molecular Clouds in Andromeda - alongside their CO isotopologue emis sion. These results are helping to bridge the gap between Galactic and extr agalactic star formation studies\, placing our detailed view of local Galac tic star formation in a wider context.

    CATEGORIES:Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mpifraifa-m ain-colloquium-speaker-prof-jan-forbrich/ END:VEVENT BEGIN:VEVENT UID:20250516T0627Z-1747376874.9269-EO-14824-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20250515T163840Z LAST-MODIFIED:20250515T163840Z DTSTART;TZID=Europe/Berlin:20250613T110000 DTEND;TZID=Europe/Berlin:20250613T123000 SUMMARY: MPIfR/AIfA Main Colloquium\, Speaker: Dr. Amit Seta DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium Titel: The Electron Density Structure of the Milky Way Speaker: Dr. Amit Seta\, ARC DECRA fellow at the Australian Natio nal University Even though the interstellar medium (ISM) of star-forming ga laxies has been known to have a multiphase structure (broadly hot\, warm\, and cold phases) since […] X-ALT-DESC;FMTTYPE=text/html:

    Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium

    Ti tel: The Electron Density Structure of the Milky Way

    Speaker: Dr. Ami t Seta\, ARC DECRA fellow at the Australian National University

    Even though the interstellar medium (ISM) of star-forming galaxies has been know n to have a multiphase structure (broadly hot\, warm\, and cold phases) sin ce the 1970s\, how magnetic fields differ between the ISM phases is still u nknown. Using a combination of theory\, simulations\, and observations\, th is talk explores how the multiphase nature of the ISM shapes magnetic field s. In particular\, using Zeeman magnetic field measurements and pulsar obse rvations\, the relationship between the turbulent kinetic and magnetic ener gy densities will be established. The findings from these studies will enha nce our understanding of the role of magnetic fields in star formation and galaxy evolution\, and also prepare us to harness the upcoming wealth of ra dio polarisation data from the SKA.

    CATEGORIES:Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mpifraifa-m ain-colloquium-speaker-dr-amit-seta/ END:VEVENT BEGIN:VEVENT UID:20250604T1855Z-1749063332.857-EO-14845-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20250604T164446Z LAST-MODIFIED:20250604T164534Z DTSTART;TZID=Europe/Berlin:20250616T090000 DTEND;TZID=Europe/Berlin:20250616T110000 SUMMARY: PhD colloquium: Yvonne Fichtner DESCRIPTION: PhD colloquium\, location: Lecture Hall 0.012 AIfA Yvonne Fich tner The impact of stellar feedback on the circumstellar medium and galaxy evolution Abstract: Feedback from stars plays a crucial role in the formati on and evolution of galaxies\, impacting for instance the star formation ra te and morphology. Stellar feedback must be incorporated into simulations o f galaxies through sub-grid […] X-ALT-DESC;FMTTYPE=text/html:

    PhD colloquium\, location: Lecture Hall 0. 012 AIfA

    Yvonne Fichtner

    The impact of ste llar feedback on the circumstellar medium and galaxy evolution

    Abstr act:

    Feedback from stars plays a crucial role in the formation and ev olution of galaxies\, impacting for instance the star formation rate and mo rphology. Stellar feedback must be incorporated into simulations of galaxie s through sub-grid models\, which rely on simplifying assumptions. In this talk\, I will examine some of these assumptions with the aim to improve sub -grid models.
    For this aim\, we derive in the first project presented the stellar wind feedback from a grid of massive stellar models\, in which we account for stellar rotation\, binarity\, and different metallicities. C ompared to the commonly assumed case of non-rotating single stars\, account ing for stellar rotation and binarity can strongly increase the feedback en ergy from stellar winds\, especially at low metallicity. Incorporating stel lar winds in a cosmological simulation results in a reduced stellar mass\, outflows\, and star formation fluctuations of the simulated galaxy. However \, a galaxy simulated with feedback from rotating stars and binary systems has properties similar to those of a galaxy simulated with only non-rotatin g stars\, despite the differences in the stellar wind energy.
    In a sec ond project\, we examine how the circumstellar medium\, which is unresolved in galaxy simulations\, influences the available stellar feedback at large r scales. We perform 1D simulations of the circumstellar medium\, affected by stellar winds\, photoionisation and supernova feedback. We find that the circumstellar medium can alter the available feedback in various ways\, e. g. by dissipating energy\, with the effects being stronger at larger distan ce from the feedback source.
    Finally\, we present a preliminary sub-gr id feedback model that incorporates the previous results and discuss challe nges that the model faces.

    CATEGORIES:Thesis Defense ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/phd-colloqu ium-yvonne-fichtner/ END:VEVENT BEGIN:VEVENT UID:20250625T1705Z-1750871155.1141-EO-14848-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20250625T090207Z LAST-MODIFIED:20250625T090207Z DTSTART;TZID=Europe/Berlin:20250627T110000 DTEND;TZID=Europe/Berlin:20250627T123000 SUMMARY: MPIfR/AIfA Main Colloquium\, Speaker: Dr. Antonia Rowlinson DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium Titel: Chasing coherent radio emission from b inary neutron star mergers with LOFAR2.0 Speaker: Dr. Antonia Rowlinson\, U niversity of Amsterdam and ASTRON Binary neutron star mergers are exciting high energy phenomena in our Universe\, leading to gravitational wave event s\, gamma-ray bursts and kilonovae. We know the […] X-ALT-DESC;FMTTYPE=text/html:

    Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium

    Ti tel: Chasing coherent radio emission from binary neutron star merge rs with LOFAR2.0

    Speaker: Dr. Antonia Rowlinson\, University of Amsterdam and ASTRON

    Binary neutron star mergers are exciting hig h energy phenomena in our Universe\, leading to gravitational wave events\, gamma-ray bursts and kilonovae. We know the majority of gold and other hea vy elements are produced by these events. However\, a key outstanding quest ion is: What is the remnant formed by these mergers? A black hole or an eve n more massive neutron star? If it is a neutron star\, it will be spinning at near break-up velocities with a huge magnetic field – a newborn magnetar . By studying emission in X-rays and optical following these mergers\, ther e are hints that we have seen the formation of magnetars. The newly formed magnetar is predicted to give bright\, short duration\, flashes of coherent radio emission soon after its formation. I am using LOFAR to chase these c oherent signals following binary mergers and\, excitingly\, we have our fir st candidate detection. To firmly associate candidates with poorly localise d binary mergers\, we also require deep transient surveys with LOFAR. In th is colloquium\, I will describe the magnetar central engine model for binar y neutron star mergers and outline the key results from our fast transient surveys in the image plane with LOFAR. Looking towards LOFAR2.0\, I will de scribe our efforts to fully automate fast transient image plane searches to find coherent radio transients from multiple progenitor systems. Finally\, I will introduce the upcoming AARTFAAC2.0 and outline the exciting results we hope to obtain from it.

    CATEGORIES:Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mpifraifa-m ain-colloquium-speaker-dr-antonia-rowlinson/ END:VEVENT BEGIN:VEVENT UID:20250708T0528Z-1751952485.0551-EO-14859-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20250707T121224Z LAST-MODIFIED:20250707T121224Z DTSTART;TZID=Europe/Berlin:20250710T090000 DTEND;TZID=Europe/Berlin:20250710T110000 SUMMARY: PhD colloquium: Mandar Karandikar DESCRIPTION: PhD colloquium\, location: Lecture Hall 0.012 AIfA Mandar Kara ndikar Perturbative and non-perturbative theories of structure formation Ab stract: Understanding the formation of structure in the Universe is one of cosmology’s primary goals. The material content of the Universe is dominate d by an invisible\, non-baryonic component which we call dark matter. The g ravitational force drives the clustering of […] X-ALT-DESC;FMTTYPE=text/html:

    PhD colloquium\, location: Lecture Hall 0. 012 AIfA

    Mandar Karandikar

    Perturb ative and non-perturbative theories of structure formation

    Abstract:

    Understanding the formation of structure in the Universe is one of cosmology's primary goals. The material content of the Universe is dominated by an invisible\, non-baryonic component which we call dark matte r. The gravitational force drives the clustering of dark matter from initia lly-small density fluctuations to virialised objects. At early times\, and on large scales\, cosmological perturbation theory (PT) provides a good mod el for structure formation. As local overdensities approach unity\, the ass umptions underlying PT start to break down. The EFTofLSS is an extension to PT which fixes some of PT's conceptual issues and makes accurate predictio ns in this regime. At late times\, and/or on small scales\, dark matter clu mps collapse to form virialised structures called halos. In this non-linear regime\, analytical models are approximations\, and we require N- body simulations to accurately probe these scales.

    This thesis is mad e up of two key projects. The first of these probes the quasi-linear regime and makes conceptual inquiries into the EFTofLSS. The framework assumes th at the stress tensor of the dark matter fluid may be expanded in a Maclauri n series about the overdensity and velocity fields. The coefficients of thi s expansion may be interpreted in two ways. In the top-down sense\, they ar e free parameters calculable by matching the dark matter power spectrum to observations\, while in the bottom-up sense they are measurable in simulati ons. We specialise to a one-dimensional\, dark-matter only universe\, where these two approaches can be directly compared. We find that the top-down a nd bottom-up predictions agree with each other\, providing evidence for the robustness of the EFTofLSS assumptions. Additionally\, we perform controll ed tests that shine a light on non-linear dynamics within the EFTofLSS.

    The second project explores the formation of halos in the non-linear reg ime. The conventional analytical approach is to treat gravitational collaps e with an idealised spherical model. Within the excursion-set theory framew ork\, spherical collapse (and its ellipsoidal extension) maps the initial o verdensity field of a proto-halo to its collapsed descendant. In this work\ , we provide an alternative to this traditional approach. Namely\, we train a neural network to predict the accretion history of halos from the tidal properties of the proto-halo. We find that the neural network predicts the accretion history and derived properties of the halo population with greate r accuracy than the analytical models.

    As cosmologists\, our modellin g of structure formation is incomplete. Although we are familiar with the p rocesses that govern it\, many details and nuances are yet to be fully unde rstood. In this thesis\, we have attempted to answer some open questions in this field. Through this work\, we have validated the current theoretical framework to model structure formation on large scales\, and introduced a n ovel approach to understand the formation of non-linear structures.

    CATEGORIES:Thesis Defense ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/phd-colloqu ium-mandar-karandikar/ END:VEVENT BEGIN:VEVENT UID:20250709T1858Z-1752087525.2636-EO-14878-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20250709T091704Z LAST-MODIFIED:20250709T154442Z DTSTART;TZID=Europe/Berlin:20250711T110000 DTEND;TZID=Europe/Berlin:20250711T123000 SUMMARY: MPIfR/AIfA Main Colloquium\, Speaker: Dr. Neco Kriel DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium Titel: Magnetic Growth in Transient (Galactic ) Dynamos Speaker: Dr. Neco Kriel\, Australian National University Small-sc ale dynamos are thought to explain how weak magnetic fields in the early un iverse were amplified to the strengths we observe in galaxies today. While this process is usually associated with […] X-ALT-DESC;FMTTYPE=text/html:

    Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium

    Ti tel: Magnetic Growth in Transient (Galactic) Dynamos

    Speaker: Dr. Neco Kriel\, Australian National University

    Small-scale dynamos are thought to explain how weak magnetic fields in the early unive rse were amplified to the strengths we observe in galaxies today. While thi s process is usually associated with the early stages of galaxy formation\, mergers between mature galaxies can trigger bursts of turbulence that reig nite dynamo activity. A key question is how quickly the magnetic energy gro ws during these events. Seminal theories suggest this process could be too slow to matter – taking longer than the age of the universe – because growt h is limited by slow diffusion. However\, recent works have begun to challe nge this idea. In this talk\, I will present new simulations that explore t his question and offer insight into the processes that regulate magnetic gr owth in galaxies.

    CATEGORIES:Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mpifraifa-m ain-colloquium-speaker-dr-sasha-plavin/ END:VEVENT BEGIN:VEVENT UID:20250709T1858Z-1752087525.2851-EO-14872-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20250708T143656Z LAST-MODIFIED:20250708T143656Z DTSTART;TZID=Europe/Berlin:20250715T140000 DTEND;TZID=Europe/Berlin:20250715T160000 SUMMARY: PhD colloquium: Christos Karoumpis DESCRIPTION: PhD colloquium\, location: Auditorium 0.02\, MPIfR Christos Ka roumpis Line Intensity Mapping the Epoch of Reionization with the Fred Youn g Submillimeter Telescope The very first galaxies that formed after the Big Bang can now be detected in small numbers with sensitive space telescope o bservations. Wide area surveys revealing their large-scale distribution and relation to the cosmic web […] X-ALT-DESC;FMTTYPE=text/html:

    PhD colloquium\, location: Auditorium 0.02 \, MPIfR

    Christos Karoumpis

    Line Intensity Mapping the Epoch of Reionization with the Fred Young Submillimeter Telesc ope

    The very first galaxies that formed after the Big Bang can now b e detected in small numbers with sensitive space telescope observations. Wi de area surveys revealing their large-scale distribution and relation to th e cosmic web are yet not feasible. However\, line intensity mapping (LIM) o ffers a technique to map their distribution without resolving individual so urces. In my work I forecast LIM observations of the [CII]158 μm carbon fin e structure emission line with the Fred Young Submillimeter Telescope (FYST ) that is currently deployed at 5600 meter altitude in Chile\, a project Bo nn has been a major partner in. At the angular resolution of 60 to 30 arcse c at 205 to 440 GHz of the 6-meter FYST aperture\, LIM captures the cumulat ive emission from [CII]  of galaxies at redshifts 3.4 to 8.3. The power spe ctrum of the 3-D tomographic data reveals their spatial clustering on scale s above 300 kpc as well as their star formation properties.  We model the  [CII] power spectrum using the IllustrisTNG300 cosmological simulation. The detectability of the [CII] signal largely depends on our ability to model the overlying CO emission from lower-redshift galaxies. By masking known fo reground galaxies we find that the [CII] signal can be recovered at redshif t 3.4 to 4.8\, while higher redshifts will require the development of more advanced mitigation strategies we currently work on.

     

    CATEGORIES:Thesis Defense ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/phd-colloqu ium-christos-karoumpis/ END:VEVENT BEGIN:VEVENT UID:20250714T0637Z-1752475043.3342-EO-14880-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20250711T115100Z LAST-MODIFIED:20250711T115100Z DTSTART;TZID=Europe/Berlin:20250718T110000 DTEND;TZID=Europe/Berlin:20250718T130000 SUMMARY: MPIfR/AIfA Main Colloquium\, Speaker: Prof. Dominik Schleicher DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium Titel: Origin of supermassive black holes – a n astrophysical assessment of possible formation channels Speaker: Prof. Do minik Schleicher\, Dipartimento di Fisica – Sapienza\, Università di Roma T heoretical models and observational data provide strong support for the ori gin of supermassive black holes via collision-based formation channels. […] X-ALT-DESC;FMTTYPE=text/html:

    Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium

    Ti tel: Origin of supermassive black holes - an astrophysical assessme nt of possible formation channels

    Speaker: Prof. Dominik Sch leicher\, Dipartimento di Fisica - Sapienza\, Università di Roma

    Theo retical models and observational data provide strong support for the origin of supermassive black holes via collision-based formation channels. An ana lysis of Nuclear Star Clusters in the Local Universe suggests that these ar e stable when the typical collision timescales are much longer compared ot the ages of these systems. We present here a suite of numerical simulations designed to test this scenario\, where we widely vary the typical collisio n timescales as compared to the ages of the system. Our results show that t he efficiency to form central massive objects strongly depends on the ratio of cluster ages over collision timescales\, which can be expressed in rela tion to a typical mass scale for collisions. We present some of the largest recently pursued N-body simulations designed to verify this scenario\, sho wing the efficient formation of a supermassive black hole with more than 20 .000 solar masses through stellar collisions. We compare our results with t he Young Massive Star Clusters detected in high-redshift galaxies via the J ames Webb Space Telescope\, providing an expected relation between the mass es of these clusters and the massive black holes forming within them. We fu rther show and discuss how the presence of gas may alter the predictions fr om the N-body simulations.

    CATEGORIES:Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mpifraifa-m ain-colloquium-speaker-prof-dominik-schleicher/ END:VEVENT BEGIN:VEVENT UID:20250709T1858Z-1752087525.2936-EO-14876-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20250709T091417Z LAST-MODIFIED:20250709T091417Z DTSTART;TZID=Europe/Berlin:20250729T140000 DTEND;TZID=Europe/Berlin:20250729T160000 SUMMARY: PhD colloquium: Jianwen Zhou DESCRIPTION: PhD colloquium\, location: Lecture Hall 0.02 MPIfR Jianwen Zho u Hierarchical hub-filament structures of molecular gas: star formation and cluster evolution   X-ALT-DESC;FMTTYPE=text/html:

    PhD colloquium\, location: Lecture Hall 0. 02 MPIfR

    Jianwen Zhou

    Hierarchical hub-filament structures of molecular gas: star formation and cluster evolu tion

     

    CATEGORIES:Thesis Defense ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/phd-colloqu ium-jianwen-zhou/ END:VEVENT BEGIN:VEVENT UID:20250709T1858Z-1752087525.3008-EO-14871-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20250708T142920Z LAST-MODIFIED:20250708T142920Z DTSTART;TZID=Europe/Berlin:20250825T150000 DTEND;TZID=Europe/Berlin:20250825T170000 SUMMARY: PhD colloquium: Jiwoong Jang DESCRIPTION: PhD colloquium\, location: Auditorium 0.01\, MPIfR Jiwoong Jan g Pulsars and Gravitational Waves Pulsars are magnetized rotating neutron s tars that formed from the collapsed core of a massive star following a supe rnova. A misalignment between the beam emission axis (magnetic axis) and ro tation axis causes them to appear as a pulsating radio source. The emitted signals from […] X-ALT-DESC;FMTTYPE=text/html:

    PhD colloquium\, location: Auditorium 0.01 \, MPIfR

    Jiwoong Jang

    Pulsars and Gravitat ional Waves

    Pulsars are magnetized rotating neutron stars that forme d from the collapsed core of a massive star following a supernova. A misali gnment between the beam emission axis (magnetic axis) and rotation axis cau ses them to appear as a pulsating radio source. The emitted signals from pu lsars undergo delays due to their position\, motion\, relativistic effects and the effects of the interstellar medium. By analyzing and modelling the arrival times of pulses by accounting for every rotation of the pulsar\, th ose physical parameters can be measured. This technique is called pulsar ti ming. Pulsar timing measurements provide various applications to fundamenta l physics and astronomy. In this PhD defense\, I will present pulsar timing analysis for a single pulsar\, PSR J1439−5501\, as well as the first evide nce for the gravitational wave background.

    PSR J1439−5501 is a binary system\, consisting of a pulsar and an unusually massive white dwarf compa nion (1.0–1.3 M☉). Measuring masses and other physical characteristics of s uch unique systems provide hints for binary star evolution. A relativistic phenomenon\, Shapiro delay\, in PSR J1439−5501 allows us to measure masses but had not yet been observed. I detected a signature of Shapiro delay via timing analysis and investigated it to measure pulsar mass and companion ma ss. I analyzed pulsar scintillation\, which occurs due to interference betw een photons emitted from the pulsar travelling along different paths throug h the interstellar medium\, to measure distance to the pulsar. Using simula tion and the result of timing and scintillation\, I discuss the future stud y of PSR J1439−5501.

    Cosmological phenomena such as super massive bla ck hole binaries (SMBHBs) formed during galaxy mergers are expected to caus e low-frequency gravitational waves (GWs). An array of pulsars\, called pul sar timing array (PTA)\, can be used as a detector of such GWs\, and this w ill enable us to understand the galaxy evolution. I led the data production of 25 pulsars\, which were used to search for nano-hertz GWs. Using those data\, we found the first evidence of the GWs\, potentially caused by SMBHB s. Our spectral analysis of GWs also showed deviation between our observati on and model\, which will enable us to measure the dynamics of SMBHBs as we ll as their formation and evolution.

     

    CATEGORIES:Thesis Defense ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/phd-colloqu ium-jiwoong-jang/ END:VEVENT BEGIN:VEVENT UID:20250726T0412Z-1753503148.6084-EO-14892-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20250725T101353Z LAST-MODIFIED:20250725T101406Z DTSTART;TZID=Europe/Berlin:20250828T110000 DTEND;TZID=Europe/Berlin:20250828T180000 SUMMARY: IMPRS A&A Excursion to Effelsberg Observatory DESCRIPTION: Visit of the Effelsberg observatory including observing demons tration and guided tour of the facility. X-ALT-DESC;FMTTYPE=text/html:

    Visit of the Effelsberg observatory includ ing observing demonstration and guided tour of the facility.

    CATEGORIES:Excursion ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/imprs-aa-ex cursion-to-effelsberg/ END:VEVENT BEGIN:VEVENT UID:20250708T0528Z-1751952485.0793-EO-14860-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20250707T155914Z LAST-MODIFIED:20250707T155914Z DTSTART;TZID=Europe/Berlin:20250904T130000 DTEND;TZID=Europe/Berlin:20250904T150000 SUMMARY: Webinar: Your PhD @ Max Planck – Exploring Doctoral Programs DESCRIPTION: Register here until September 2: https://events.gwdg.de/e/PhDa tMaxPlanck2025 Are you a Master’s student who wants to explore the prospect of doing a PhD in Germany? Join us for a unique webinar event designed to give you an insight into the benefits of doing a PhD at the prestigious Max Planck Society as part of an International Max Planck […] X-ALT-DESC;FMTTYPE=text/html:

    Register here until September 2:
    htt ps://events.gwdg.de/e/PhDatMaxPlanck2025

    Are you a Master's student who wants to explore the prospect of doing a PhD in Germany? Join us for a unique webinar event designed to g ive you an insight into the benefits of doing a PhD at the prestigious Max Planck Society as part of an International Max Planck Research School (IMPR S) in North Rhine-Westphalia (NRW)\, Germany.

    Why attend?

    This we binar is an exceptional opportunity for students to gain an in-depth insigh t into the path to a PhD in the life and natural sciences. Participants wil l have the chance to interact with the managing coordinators of the partici pating doctoral programmes and discover the wide range of research fields\, resources and training opportunities available within the Max Planck Socie ty.

    Don't miss this chance to explor e the academic and research opportunities that could shape your future.

    Participating International Max Pla nck Research Schools:

    • IMPRS for As tronomy & Astrophysics

    • Cologne Graduate School for Ageing Research

    • IMPRS for Living Matter

      • < li>

      IMPRS on I nterdisciplinary Plant Biology

    • IMPRS for Sustainable Metallurgy

    • CiM-IMPRS

      • < /ul>

      Contact us: exploring.ph d@lists.mpi-dortmund.mpg.de

      We look forward to welcoming you to our webinar and helping you take the first step towards an exciting PhD journey with Max Planck in Germany!

      CATEGORIES:Career event ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/webinar-you r-phd-max-planck-exploring-doctoral-programs-2/ END:VEVENT BEGIN:VEVENT UID:20250905T0800Z-1757059243.5952-EO-14963-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20250904T173735Z LAST-MODIFIED:20250904T173840Z DTSTART;TZID=Europe/Berlin:20250905T110000 DTEND;TZID=Europe/Berlin:20250905T123000 SUMMARY: MPIfR/AIfA Main Colloquium\, Speaker: Prof. Serena Viti DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium Titel: Molecules as diagnostics of the dense gas in galaxies Speaker: Prof. Serena Viti\, Dept of Physics and Astronomy\ , University College London\, UK Molecules pervade the cooler\, denser part s of our Universe\, in particular the reservoirs of the matter that forms s tars and planets\, and […] X-ALT-DESC;FMTTYPE=text/html:

      Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium

      Ti tel: Molecules as diagnostics of the dense gas in galaxies

      Speaker: Prof. Serena Viti\, Dept of Physics and Astronomy\, Univers ity College London\, UK

      Molecules pervade the cooler\, denser parts o f our Universe\, in particular the reservoirs of the matter that forms star s and planets\,
      and the gas in the centres of galaxies. In fact\, obse rvations across the Universe reveal a surprisingly large number of molecul es and show how
      complex chemistry in space can become\, despite the h arsh environment of the interstellar medium. Molecules not only play a key role in the
      formation and the shaping of galaxies\, but they are als o great tools to trace of their physical characteristics.

      In the Milk y Way we routinely use molecules to discover and explore the dense star for ming gas and the more complex the chemistry\, the more
      details of the gas the molecules reveal. In this talk I will present an overview of molecu lar astrophysics within the context of the formation
      and evolution of stars and galaxies. I will show how molecular emission can be used to expl ore and characterize the physical conditions and
      energetics\, as well as\, possibly\, the evolutionary status of the interstellar medium. Finally \, through an observational and theoretical
      tour of recent advances i n the field\, I will show how to make molecules into one of the most powerf ul diagnostics of the formation and evolution
      of stars and galaxies. CATEGORIES:Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mpifraifa-m ain-colloquium-speaker-prof-serena-viti/ END:VEVENT BEGIN:VEVENT UID:20250214T0235Z-1739500543.669-EO-14808-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20250213T102317Z LAST-MODIFIED:20250213T102317Z DTSTART;VALUE=DATE:20250910 DTEND;VALUE=DATE:20250911 SUMMARY: IMPRS A&A excursion to German Aerospace Centre in Cologne-Wahn DESCRIPTION: Visit of the German Aerospace Centre in Cologne Wahn. The foll owing institutes and facilities will be visited depending on availability: • European Astronaut Centre (ESA) • Microgravity User Support Center MUSC ( DLR) • Institute of Aerospace Medicine (DLR) • High-flux solar furnace\, In stitute of Future Fuels (DLR) X-ALT-DESC;FMTTYPE=text/html:

      Visit of the German Aerospace Centre in Co logne Wahn.

      The following institutes and facilities will be visited d epending on availability:
      • European Astronaut Centre (ES A)
      • Microgravity User Support Center MUSC (DLR)
      • Institute of Aeros pace Medicine (DLR)
      • High-flux solar furnace\, I nstitute of Future Fuels (DLR)

      CATEGORIES:Excursion ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/imprs-aa-ex cursion-to-german-aerospace-centre-in-cologne-wahn-2/ END:VEVENT BEGIN:VEVENT UID:20250603T1224Z-1748953486.3036-EO-14839-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20250603T110111Z LAST-MODIFIED:20250603T110111Z DTSTART;TZID=Europe/Berlin:20250910T110000 DTEND;TZID=Europe/Berlin:20250910T123000 SUMMARY: PhD colloquium: Miquel Colom i Bernadich DESCRIPTION: PhD colloquium\, location: Auditorium 0.02\, MPIfR Miquel Colo m i Bernadich Southern Galactic Pulsars with MeerKAT: Surveys\, Timing\, an d Fun with Old and New Discoveries Pulsars are highly magnetised\, rapidly spinning neutron stars. Using the technique of pulsar timing\, we can model their rotational slowdown with microsecond precision\, tracking every sing le rotation. When found in compact binary […] X-ALT-DESC;FMTTYPE=text/html:

      PhD colloquium\, location: Auditorium 0.02 \, MPIfR

      Miquel Colom i Bernadich

      Southern Galactic Pulsars with MeerKAT: Surveys\, Timing\, and Fun with Old and New Discoveries

      Pulsars are highly magnetised\, rapidly spinning neutro n stars. Using the technique of pulsar timing\, we can model their rotation al slowdown with microsecond precision\, tracking every single rotation. Wh en found in compact binary systems\, pulsar timing enables measurements of relativistic post-Keplerian corrections to the orbit\, allowing tests of fu ndamental physics and precise stellar mass determinations. Despite the disc overy of over 4\,000 pulsars\, many questions remain open\, ranging from st ellar mass distributions to the physics of dense matter\, tests of theories of gravity and binary evolution\, questions that can only be addressed thr ough pulsar timing. In this PhD defence\, I present new results on southern Galactic pulsars based on observations from two radio observatories with a privileged view of the southern Galactic plane: the Murriyang telescope in Parkes\, Australia\, and the SKA pathfinder MeerKAT in South Africa. Murri yang is a 64-metre single-dish telescope with wide instantaneous bandwidth coverage\, while the 64 antennas of MeerKAT form the most sensitive radio i nterferometer in the Southern Hemisphere. Their combined use\, and especial ly the high sensitivity of MeerKAT\, has opened new scientific opportunitie s for studying southern Galactic pulsars. I will present discoveries from t he MPIfR–MeerKAT Galactic Plane Survey\, the first wide-field interferometr ic pulsar survey\, which has led to over 80 new detections. Thanks to MeerK AT’s interferometric capabilities\, the sky localisation of new pulsars is instantaneous\, significantly accelerating the derivation of timing solutio ns. Among these discoveries is PSR J1208–5936\, a double neutron star syste m that will merge within a Hubble time due to gravitational-wave emission. This system and the performance of the survey provide valuable constraints on the neutron star merger rate in the Milky Way. Newly discovered pulsar–w hite dwarf systems also offer promising insights into mass distributions an d binary evolution pathways. I will also present precise stellar mass measu rements of the massive pulsar–white dwarf binary PSR J1227–6208\, based on joint timing with MeerKAT and Murriyang. Its companion is an oxygen–neon–ma gnesium white dwarf potentially near the Chandrasekhar limit. Using Bayesia n inference to model dispersion-measure-induced timing noise\, we constrain the companion’s mass to lie between 1.2 and 1.5 solar masses\, confirming its massive nature. This is only the third such mass measurement for this t ype of system\, made possible by the combined sensitivity and frequency cov erage of both telescopes. These results demonstrate the complementary stren gths of MeerKAT and Murriyang\, and they highlight the scientific potential of future facilities such as MeerKAT+ and the SKA. In particular\, MeerKAT ’s surveys offer a valuable blueprint for the next generation of pulsar sea rches and timing experiments with the SKA.

       

      CATEGORIES:Thesis Defense ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/phd-colloqu ium-miquel-colom-i-bernadich/ END:VEVENT BEGIN:VEVENT UID:20251009T1911Z-1760037093.3595-EO-15004-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20251009T142924Z LAST-MODIFIED:20251009T152314Z DTSTART;TZID=Europe/Berlin:20251010T110000 DTEND;TZID=Europe/Berlin:20251010T123000 SUMMARY: MPIfR/AIfA Main Colloquium\, Speaker: Dr. Ralf Klessen DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium Titel: The First Stars: Formation\, Propertie s\, and Impact Speaker: Dr. Ralf Klessen\, University of Heidelberg The fir st generation of stars\, often called Population III (or Pop III)\, form fr om metal-free primordial gas at redshifts z ~ 30 and below. They dominate t he cosmic star formation history […] X-ALT-DESC;FMTTYPE=text/html:

      Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium

      Ti tel: The First Stars: Formation\, Properties\, and Impact< /p>

      Speaker: Dr. Ralf Klessen\, University of Heidelberg

      The first generation of stars\, often called Population III (or Pop III)\, form from metal-free primordial gas at redshifts z ~ 30 and below. They dominate the cosmic star formation history until z ~ 20-15\, at which point the formatio n of metal-enriched Pop II stars takes over. I review current theoretical m odels for the formation\, properties and impact of Pop III stars\, and disc uss observational constraints. I argue that primordial gas is highly suscep tible to fragmentation and Pop III stars form as members of small clusters with a logarithmically flat mass function. Feedback from massive Pop III st ars plays a central role in regulating subsequent star formation\, but majo r uncertainties remain regarding its immediate impact. Direct observations of Pop III stars in the early Universe remain highly challenging\, whereas stellar archeological surveys allow us to constrain both the low-mass and t he high-mass ends of the Pop III mass distribution. Observations suggest th at most massive Pop III stars end their lives as core-collapse supernovae r ather than as pair-instability supernovae. I also speculate about the forma tion of supermassive stars\, which under very specific circumstances can ge t as massive as several 100.000 solar masses and can become the seeds of th e supermassive black holes observed in the high-redshift Universe.

      CATEGORIES:Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mpifraifa-m ain-colloquium-speaker-prof-pauline-gagnon-2/ END:VEVENT BEGIN:VEVENT UID:20250726T0412Z-1753503148.6584-EO-14891-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20250725T101207Z LAST-MODIFIED:20250725T101207Z DTSTART;VALUE=DATE:20251013 DTEND;VALUE=DATE:20251016 SUMMARY: Annual IMPRS Retreat this year to Essen X-ALT-DESC;FMTTYPE=text/html: CATEGORIES:Retreat ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/annual-impr s-retreat-this-year-to-essen/ END:VEVENT BEGIN:VEVENT UID:20251009T0613Z-1759990424.8768-EO-15003-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20251008T165806Z LAST-MODIFIED:20251009T091304Z DTSTART;TZID=Europe/Berlin:20251017T120000 DTEND;TZID=Europe/Berlin:20251017T140000 SUMMARY: PhD colloquium: Jongseo Kim DESCRIPTION: PhD colloquium\, location: Ph1\, Cologne Jongseo Kim Bayesian calibration and imaging in radio interferometry Abstract: This dissertation presents a Bayesian framework for joint calibration and imaging in radio i nterferometry. Traditional methods\, such as AIPS\, CASA\, and DIFMAP\, tre at calibration and imaging separately\, even though both rely on shared pri or knowledge about the source and instrument. The […] X-ALT-DESC;FMTTYPE=text/html:

      PhD colloquium\, location: Ph1\, Cologne

      Jongseo Kim

      Bayesian calibration and imaging in radio in terferometry

      Abstract:

      This dissertation presents a Ba yesian framework for joint calibration and imaging in radio interferometry. Traditional methods\, such as AIPS\, CASA\, and DIFMAP\, treat calibration and imaging separately\, even though both rely on shared prior knowledge a bout the source and instrument. The Bayesian approach developed here\, impl emented in the Bayesian imaging resolve software\, overcomes this limitatio n by jointly inferring calibration and image parameters\, naturally account ing for calibration uncertainties in the final reconstruction.
      Using v ariational inference to mitigate computational costs\, this method achieves high-fidelity and super-resolved images while providing uncertainty estima tes for calibration and imaging results. The framework is extended to inclu de polarimetric calibration\, enabling robust full-Stokes imaging.
      The approach is validated on observations of active galactic nuclei (AGNs)\, k ey targets for studying black hole accretion and jet formation. Application s include: galaxy M87 at 43 and 86 GHz (VLBA\, GMVA+ALMA)\, revealing the b lack hole shadow and jet with improved resolution and quantified uncertaint ies in ring parameters\, Quasar 3C273 (VLBA\, 15 GHz) and blazar OJ287 (GMV A+ALMA\, 86 GHz)\, producing reliable polarimetric images and instrumental calibration (gains\, D-terms)\, and radio galaxy Hydra A (VLA\, 2.5 GHz)\, demonstrating full Bayesian calibration and imaging using resolve.
      Alt ogether\, this dissertation demonstrates that Bayesian calibration and imag ing approach for full polarimetric radio interferometric data can reconstru ct reliable calibration solutions and images with high resolution and provi de better observational constraints with uncertainties to understand the in ner structure of AGNs and their jet formation.

      CATEGORIES:Thesis Defense ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/phd-colloqu ium-jongseo-kim/ END:VEVENT BEGIN:VEVENT UID:20251009T1911Z-1760037093.4285-EO-15005-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20251009T152531Z LAST-MODIFIED:20251009T152531Z DTSTART;TZID=Europe/Berlin:20251024T110000 DTEND;TZID=Europe/Berlin:20251024T123000 SUMMARY: MPIfR/AIfA Main Colloquium\, Speaker: Dr. Gabriele Surcis DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium Titel: Back to the Future – a journey in mase r polarization studies Speaker: Dr. Gabriele Surcis\, Osservatorio Astronom ico di Cagliari\, INAF Among the radiative emission processes that can be o bserved in the Universe\, the most intriguing one is the astronomical maser emission. Since its discovery and […] X-ALT-DESC;FMTTYPE=text/html:

      Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium

      Ti tel: Back to the Future – a journey in maser polarization studies

      Speaker: Dr. Gabriele Surcis\, Osservatorio Astronomico di Ca gliari\, INAF

      Among the radiative emission processes that can be obse rved in the Universe\, the most intriguing one is the astronomical maser em ission. Since its discovery and first observation in 1963\, the astronomers recognized the great importance that this type of emission could have in u nveiling the unseen. Only 10 years later\, the first theoretical and observ ational works about their polarized emission were published. Nowadays\, we have observed many maser species and emissions. They allow us to measure th e gas dynamics\, distances\, and even magnetic fields besides other physica l parameters. Most of the studies are focused on the first phases of high-m ass star formation where the masers are predominantly observed. Indeed\, ma sers are one of the best probes for investigating the inner structure of ma ssive young stellar objects (YSOs) such as disks and jets. Their strong and narrow radio emissions can penetrate otherwise obscured molecular clouds\, offering a unique window into these environments. The aim of my Colloquium is to lead you through a journey in maser polarization studies that starte d with my PhD here in Bonn about 15 years ago. After providing the necessar y tools for understanding the maser polarimetry and describing the astronom ical context\, I will focus on two main projects. The first regarding the m onitoring of the high-mass star-forming region W75N(B)\, where several radi o sources have been detected. Among them the massive YSOs VLA 1 and VLA 2 a re thought to be in different evolutionary stages and towards which the 22 GHz water masers have been monitored\, also in polarimetric mode\, over a p eriod of about 25 years. The second project focuses on determining\, throug h polarimetric observations of 6.7 GHz methanol maser emission\, if there e xists a preferred orientation of the magnetic field with respect to the out flow axis in massive YSOs. Finally\, I will highlight how observational ast ronomy often requires a round-trip through laboratory experiments and theor y to provide otherwise inaccessible results.

      CATEGORIES:Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mpifraifa-m ain-colloquium-speaker-dr-gabriele-surcis/ END:VEVENT BEGIN:VEVENT UID:20250726T0412Z-1753503148.6644-EO-14893-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20250725T101748Z LAST-MODIFIED:20250725T101748Z DTSTART;TZID=Europe/Berlin:20251028T100000 DTEND;TZID=Europe/Berlin:20251028T160000 RDATE;TZID=Europe/Berlin:20251029T100000 SUMMARY: Black Board Lectures by Dr. Carlos Duran DESCRIPTION: Modern instrumentation in Radio Astronomy X-ALT-DESC;FMTTYPE=text/html:

      Modern instrumentation in Radio Astronomy

      CATEGORIES:Blackboard ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/black-board -lectures-by-dr-carlos-duran/ END:VEVENT BEGIN:VEVENT UID:20251009T1911Z-1760037093.4562-EO-15006-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20251009T152856Z LAST-MODIFIED:20251009T152856Z DTSTART;TZID=Europe/Berlin:20251031T110000 DTEND;TZID=Europe/Berlin:20251031T123000 SUMMARY: MPIfR/AIfA Main Colloquium\, Speaker: Prof. Michelle Ntampaka DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium Titel: Trustworthy Machine Learning for Cosmo logical Discovery Speaker: Prof. Michelle Ntampaka\, Space Telescope Scienc e Institute Modern machine learning techniques enable powerful data analysi s strategies that were not feasible even a few years ago\, and could lead t o transformative scientific discoveries\, e.g. with data from the […] X-ALT-DESC;FMTTYPE=text/html:

      Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium

      Ti tel: Trustworthy Machine Learning for Cosmological Discovery

      Speaker: Prof. Michelle Ntampaka\, Space Telescope Science Institu te

      Modern machine learning techniques enable powerful data analysis s trategies that were not feasible even a few years ago\, and could lead to t ransformative scientific discoveries\, e.g. with data from the Nancy Grace Roman Space Telescope. But can we trust the black box? In this talk\, I wil l highlight opportunities and challenges for creating credible ML methods t o interpret cosmological observations. I will expand on ML interpretability and domain adaptation as keystones for building models that give trustwort hy results. And I will show examples of how machine learning can be used\, not just as a tool for getting “better” results at the expense of understan ding\, but also as a partner that can point us toward physical discovery. CATEGORIES:Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mpifraifa-m ain-colloquium-speaker-prof-michelle-ntampaka/ END:VEVENT BEGIN:VEVENT UID:20251106T0107Z-1762391246.2247-EO-15031-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20251104T122642Z LAST-MODIFIED:20251104T122642Z DTSTART;TZID=Europe/Berlin:20251107T110000 DTEND;TZID=Europe/Berlin:20251107T123000 SUMMARY: MPIfR/AIfA Main Colloquium\, Speaker: Prof. Zoltan Haiman DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium Titel: Gravitational wave and electromagnetic signatures of binary black holes with circumbinary gas Speaker: Prof. Zolt an Haiman\, Institute of Science and Technology Austria Binary black holes (BHBs) embedded in dense gas hold the promise of so-called “multi-messenger astrophysics”: when they are detected both through gravitational waves (GW s) […] X-ALT-DESC;FMTTYPE=text/html:

      Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium

      Titel: Gravitational wave and electromagnetic signatures of binary blac k holes with circumbinary gas

      Speaker: Prof. Zoltan Haiman\, Institut e of Science and Technology Austria

      Binary black holes (BHBs) embedde d in dense gas hold the promise of so-called "multi-messenger astrophysics" : when they are detected both through gravitational waves (GWs) and electro magnetic (EM) observations\, they will enable novel science. This is true b oth for massive BHBs\, whose GWs will be detectable by the future LISA sate llite and by on-going pulsar timing arrays (PTAs)\, as well as for stellar- mass BHBs detected through ground-based GW detectors. In both cases\, ident ifying the coalescing binaries through their EM signatures will help clarif y their astrophysical origin and yield novel probes of cosmology\, fundamen tal physics\, and accretion physics. In this talk\, I will describe how cir cumbinary gas may produce characteristic EM signatures for both massive and stellar-mass BHBs\, based on analytic models as well as hydrodynamical sim ulations. I will also argue that in both cases\, some coalescing binaries m ay have already been detected in optical surveys\, providing clues about th eir origin.

      CATEGORIES:Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mpifraifa-m ain-colloquium-speaker-prof-zoltan-haiman/ END:VEVENT BEGIN:VEVENT UID:20250603T1224Z-1748953486.3705-EO-14842-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20250603T110815Z LAST-MODIFIED:20250603T110815Z DTSTART;TZID=Europe/Berlin:20251114T110000 DTEND;TZID=Europe/Berlin:20251114T123000 SUMMARY: MPIfR/AIfA Main Colloquium\, Speaker: Prof. Pauline Gagnon DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium Titel: The tragic destiny of Mileva Marić Ein stein Speaker: Prof. Pauline Gagnon\, CERN What were Albert Einstein’s firs t wife’s contributions to his extraordinary productivity in the first years of his career? A first biography of Mileva Marić Einstein was published in Serbian in 1969 but […] X-ALT-DESC;FMTTYPE=text/html:

      Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium

      Ti tel: The tragic destiny of Mileva Marić Einstein

      Spe aker: Prof. Pauline Gagnon\, CERN

      What were Albert Einstein's first w ife’s contributions to his extraordinary productivity in the first years of his career? A first biography of Mileva Marić Einstein was published in Se rbian in 1969 but remained largely unknown despite being translated first i n German\, then in French in the 1990’s. The publication of Mileva and Albe rt’s love letters in 1987 revealed how they lived together while two recent publications shed more light on Mileva Marić’s life and work. I will revie w this evidence in its social and historical context to give a better idea of her contributions. In this presentation\, I avoid all type of speculatio n and do not attack Albert Einstein personally\, but rather strictly stick to facts. The audience will be able to appreciate why such a talented physi cist has been so unkindly treated by history.

      CATEGORIES:Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mpifraifa-m ain-colloquium-speaker-prof-pauline-gagnon/ END:VEVENT BEGIN:VEVENT UID:20250726T0412Z-1753503148.6769-EO-14894-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20250725T102239Z LAST-MODIFIED:20250725T102239Z DTSTART;TZID=Europe/Berlin:20251117T100000 DTEND;TZID=Europe/Berlin:20251117T140000 RRULE:FREQ=DAILY;INTERVAL=1;UNTIL=20251121T090000Z SUMMARY: Black Board Lectures by Dr. Dario Colombo\, Dr. Veselina Kalinova and Dr. Gunther Witzel DESCRIPTION: Foundations and Applications of Machine Learning Lunchbreak fr om 12-13\, extended break of 2 hours on Friday November\, 21 due to Main Co lloquium. X-ALT-DESC;FMTTYPE=text/html:

      Foundations and Applications of Machine L earning

      Lunchbreak from 12-13\, extended break of 2 hours on Friday November\, 21 due to Main Colloquium.

      CATEGORIES:Blackboard ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/black-board -lectures-by-dr-dario-colombo-dr-veselina-kalinova-and-dr-gunther-witzel/ END:VEVENT BEGIN:VEVENT UID:20251118T1305Z-1763471118.069-EO-15033-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20251118T103146Z LAST-MODIFIED:20251118T103146Z DTSTART;TZID=Europe/Berlin:20251121T110000 DTEND;TZID=Europe/Berlin:20251121T123000 SUMMARY: MPIfR/AIfA Main Colloquium\, Speaker: Prof. Jennifer Schober DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium Titel: The magnetic history of our Universe S peaker: Prof. Jennifer Schober\, AIfA\, University of Bonn\, Germany Magnet ic fields are observed on virtually all astrophysical length scales of the modern Universe\, from planets and stars to galaxies and galaxy clusters. I n these dense regions of the […] X-ALT-DESC;FMTTYPE=text/html:

      Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium

      Ti tel: The magnetic history of our Universe

      Speaker: Prof. Jennifer Sch ober\, AIfA\, University of Bonn\, Germany

      Magnetic fields are observ ed on virtually all astrophysical length scales of the modern Universe\, fr om planets and stars to galaxies and galaxy clusters. In these dense region s of the Universe\, magnetic fields most likely arise from magnetohydrodyna mical dynamos - mechanisms that convert turbulent kinetic energy to magneti c energy by randomly stretching and twisting field lines. In my talk I will present some recent insights in the nature of these dynamos. In the second part of my talk I will shift the focus to the underdense region of the Uni verse the cosmic voids. Here\, observations of blazer's suggest that even t he intergalactic medium is permeated by magnetic fields. Such large-scale f ields were most likely generated very shortly after the Big Bang and theref ore are a unique window into the physics of the very early Universe. I will give a brief overview of theoretical models of magnetogenesis in the very early Universe and discuss their pre-recombination evolution in magnetohydr odynamical turbulence.

      CATEGORIES:Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mpifraifa-m ain-colloquium-speaker-prof-jennifer-schober/ END:VEVENT BEGIN:VEVENT UID:20251205T0743Z-1764920623.6603-EO-15056-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20251204T174636Z LAST-MODIFIED:20251204T174636Z DTSTART;TZID=Europe/Berlin:20251205T110000 DTEND;TZID=Europe/Berlin:20251205T123000 SUMMARY: MPIfR/AIfA Main Colloquium\, Speaker: Dr. Alberto Roper Pol DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium Titel: Multi-messenger searches of primordial magnetic fields and gravitational waves Speaker: Dr. Alberto Roper Pol\, G eneva Cosmology and Astroparticle Group\, University of Geneva\, Switzerlan d Primordial magnetic fields produced in the early Universe would\, on one hand\, have an impact on the dynamics of the fluid […] X-ALT-DESC;FMTTYPE=text/html:

      Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium

      Ti tel: Multi-messenger searches of primordial magnetic fields and gravitation al waves

      Speaker: Dr. Alberto Roper Pol\, Geneva Cosmology and Astrop article Group\, University of Geneva\, Switzerland

      Primordial magneti c fields produced in the early Universe would\, on one hand\, have an impac t on the dynamics of the fluid perturbations in the primordial plasma and h ence lead to the development of MHD turbulence\, modifying the expected bac kground of gravitational waves (GWs) from early Universe sources like a fir st-order phase transition. Future GW experiments like the space-based LISA mission could probe a first-order phase transition at the electroweak scale and\, hence\, future observations can be used as an indirect observatory f or beyond the Standard Model physics as well as for cosmological magnetic f ields. Similarly\, current observations by Pulsar Timing Array collaboratio ns can be used to probe signals at the QCD scale. On the other hand\, primo rdial magnetic fields originating in the early Universe would have undergon e a period of turbulent MHD decay within the radiation-dominated era until the recombination epoch\, when they could induce baryon clumping\, potentia lly alleviating the Hubble tension\, and then be present during the Large S cale Structure formation. The relic magnetic field would stay almost unaffe cted in the cosmic voids and\, therefore\, it could serve as a seed for the intergalactic magnetic fields indirectly observed by γ-ray observatories l ike Fermi-LAT.I will present theoretical and numerical studies that are tar getting the production of gravitational waves from MHD turbulence and the e volution of primordial magnetic fields during the early Universe with the o bjective to establish a multi-messenger approach to observations of cosmolo gical magnetic fields and first-order phase transitions in the early Univer se.

      CATEGORIES:Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mpifraifa-m ain-colloquium-speaker-dr-alberto-roper-pol/ END:VEVENT BEGIN:VEVENT UID:20251205T0743Z-1764920623.7108-EO-15057-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20251204T174902Z LAST-MODIFIED:20251204T174902Z DTSTART;TZID=Europe/Berlin:20251212T110000 DTEND;TZID=Europe/Berlin:20251212T123000 SUMMARY: MPIfR/AIfA Main Colloquium\, Speaker: Dr. Marcin Glowacki DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium Titel: PATCHwork and MockKATS: Neutral hydrog en discoveries with MeerKAT and comparisons with samples using hydrodynamic al simulations Speaker: Dr. Marcin Glowacki\, University of Edinburgh The M eerKAT radio telescope in South Africa is one of the pathfinder instruments of the Square Kilometre Array (SKA). MeerKAT is currently the […] X-ALT-DESC;FMTTYPE=text/html:

      Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium

      Ti tel: PATCHwork and MockKATS: Neutral hydrogen discoveries with MeerKAT and comparisons with samples using hydrodynamical simulations

      Speaker: Dr . Marcin Glowacki\, University of Edinburgh

      The MeerKAT radio telesco pe in South Africa is one of the pathfinder instruments of the Square Kilom etre Array (SKA). MeerKAT is currently the most sensitive radio interferome ter for neutral hydrogen (HI) studies with the 21-cm line. While dedicated science surveys such as LADUMA and MIGHTEE-HI are well underway\, several H I-rich groups have also been discovered from Open Time proposals. I will pr esent an example of this through the 49ers\, a serendipitous discovery of 4 9 new gas-rich galaxies in a MeerKAT observation. I will also highlight the hundreds more detections that have been revealed in other MeerKAT datasets since\, including HI absorption and dark galaxy candidates. Given the numb ers of HI detections with SKA pathfinders\, we are already able to replicat e samples using hydrodynamical simulations and make comparisons with observ ational studies. I will present recent and ongoing results from the ASymba collaboration\, and mock samples of the LADUMA and MIGHTEE-HI surveys with the Simba/Simba-C and COLIBRE suites through mock spectral-line cubes. Thes e results\, such as of gas asymmetry\, the baryonic Tully-Fisher relation\, and HI scaling relations which span several orders of magnitude\, are prom ising.

      CATEGORIES:Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mpifraifa-m ain-colloquium-speaker-dr-marcin-glowacki/ END:VEVENT BEGIN:VEVENT UID:20251212T2231Z-1765578688.5875-EO-15058-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20251211T182326Z LAST-MODIFIED:20251211T182326Z DTSTART;TZID=Europe/Berlin:20251219T110000 DTEND;TZID=Europe/Berlin:20251219T123000 SUMMARY: MPIfR/AIfA Main Colloquium\, Speaker: Dr. Gabriele Bruni DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium Titel: Where Fast Radio Bursts Live: A Journe y Into Their Environments Speaker: Dr. Gabriele Bruni\, National Institute for Astrophysics (INAF)\, Institute for Space Astrophysics and Planetology\ , Rome\, Italy Fast Radio Bursts (FRBs) are powerful\, millisecond-duration radio flashes originating from distant galaxies. Most of the ~850 […] X-ALT-DESC;FMTTYPE=text/html:

      Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium

      Ti tel: Where Fast Radio Bursts Live: A Journey Into Their Environments

      Speaker: Dr. Gabriele Bruni\, National Institute for Astrophysics (INAF)\, Institute for Space Astrophysics and Planetology\, Rome\, Italy

      Fast Radio Bursts (FRBs) are powerful\, millisecond-duration radio flashes origi nating from distant galaxies. Most of the ~850 known events appear as one-o ff bursts\, while only ~60 are observed to repeat. A subset of repeating FR Bs shows particularly intriguing properties: persistent radio sources (PRSs )\, large and variable dispersion measures\, and extreme Faraday rotation m easures\, all pointing to young\, highly magnetized environments or compact binary systems. Characterizing the environments in which FRBs occur has be come one of the most promising paths toward understanding their origins. Ev idence gathered from a still limited sample indicates multiple progenitor c hannels\, reflected in diverse locations\, host galaxies\, and local condit ions. The recent identification of further three PRSs through VLBI observat ions strengthens the interpretation of a nebular origin for the continuum e mission\, narrowing the viable progenitors to magnetars (favoured) or hyper accreting X-ray binaries. Looking ahead\, new dedicated radio facilities wi ll soon provide dozens of well-localized FRBs per year\, enabling a dramati c expansion of the sample of host galaxies and persistent counterparts. In this talk\, I will review the latest developments and discuss future prospe cts for unveiling the nature of FRB in the era of the SKA.

      CATEGORIES:Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mpifraifa-m ain-colloquium-speaker-dr-gabriele-bruni/ END:VEVENT BEGIN:VEVENT UID:20260129T1947Z-1769716065.0339-EO-15063-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20260129T100958Z LAST-MODIFIED:20260129T100958Z DTSTART;TZID=Europe/Berlin:20260130T110000 DTEND;TZID=Europe/Berlin:20260130T123000 SUMMARY: MPIfR/AIfA Main Colloquium\, Speaker: Prof. Caroline Heneka DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium Titel: Radio Astronomy and AI Speaker: Profes sor Caroline Heneka\, University of Heidelberg The era of radio astronomy i s rapidly transforming as next-generation instruments\, in particular the S quare Kilometre Array (SKA)\, begin to map vast portions of the observable Universe. These surveys generate enormous and complex […] X-ALT-DESC;FMTTYPE=text/html:

      Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium

      Ti tel: Radio Astronomy and AI

      Speaker: Professor Caroline Heneka\, Univ ersity of Heidelberg

      The era of radio astronomy is rapidly transformi ng as next-generation instruments\, in particular the Square Kilometre Arra y (SKA)\, begin to map vast portions of the observable Universe. These surv eys generate enormous and complex datasets\, from millions of galaxies acro ss cosmic time to mappings of the intergalactic medium and large-scale stru cture via the 21cm background during the Epoch of Reionization. Modern AI a nd machine learning methods are becoming essential for extracting scientifi c insight from these data. In this talk\, I will highlight how flexible\, d ata-driven approaches enable robust scientific analyses across the full wor kflow from simulations and observational modeling to inference\, and show h ow they help to gain insights on galaxy evolution\, the properties of the i ntergalactic medium\, and fundamental physics\, while accelerating discover y across large radio surveys.

      CATEGORIES:Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mpifraifa-m ain-colloquium-speaker-prof-caroline-heneka/ END:VEVENT BEGIN:VEVENT UID:20260207T2204Z-1770501875.4659-EO-15074-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20260206T110350Z LAST-MODIFIED:20260206T110350Z DTSTART;TZID=Europe/Berlin:20260213T110000 DTEND;TZID=Europe/Berlin:20260213T123000 SUMMARY: MPIfR/AIfA Main Colloquium\, Speaker: Professor Axel Brandenburg DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium Titel: Constraining the magnetic evolutionary track of the Universe Speaker: Professor Axel Brandenburg\, The Nordic Ins titute for Theoretical Physics (Nordita)\, Sweden Current gamma-ray and rad io observations constrain the present-day intergalactic magnetic field to b e between 10^{-16} and 10^{-9} gauss on parsec to megaparsec scales. Their […] X-ALT-DESC;FMTTYPE=text/html:

      Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium

      Ti tel: Constraining the magnetic evolutionary track of the Universe

      Spe aker: Professor Axel Brandenburg\, The Nordic Institute for Theoretical Phy sics (Nordita)\, Sweden

      Current gamma-ray and radio observations cons train the present-day intergalactic magnetic field to be between 10^{-16} a nd 10^{-9} gauss on parsec to megaparsec scales. Their filling factors in t he voids between galaxy clusters must have exceeded 10 to 30 percent\, maki ng it unlikely to be produced by astrophysical mechanisms. A magnetic field of primordial origin could have been generated in the first microseconds o f the Universe during inflation or the subsequent electroweak or quark conf inement epochs. Its comoving strength and typical scale are or will be refl ected in the spectrum of relic gravitational waves on millihertz to nanoher tz frequencies. Between generation and present-day observation\, the magnet ic field must have evolved on a specific track in a diagnostic diagram of c omoving field strength versus length scale. This evolution is described by decaying homogeneous magnetically dominated turbulence. This is the subject of high-resolution direct numerical simulations covering over 28 orders of magnitude in cosmic time\, augmented by an improved theoretical understand ing of the turbulent decay. However\, there are still some theoretical ques tions such as the effects of reconnection\, and there are numerical challen ges\, so we need to ask when can we trust the simulations. Also\, how are t he results affected by additional physics such as the detailed generation m echanism\, for example through axion-like particles\, and during the time o f recombination\, they must include the interaction between photons\, baryo ns\, as well as dark matter\, and of course the changing expansion of the u niverse. In my talk\, I will review these recent developments and discuss w ays of addressing them.

      CATEGORIES:Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mpifraifa-m ain-colloquium-speaker-professor-axel-brandenburg/ END:VEVENT BEGIN:VEVENT UID:20260207T2204Z-1770501875.4733-EO-15069-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20260202T113639Z LAST-MODIFIED:20260202T113639Z DTSTART;TZID=Europe/Berlin:20260220T110000 DTEND;TZID=Europe/Berlin:20260220T123000 SUMMARY: MPIfR/AIfA Main Colloquium\, Speaker: Dr. Eda Gjergo DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium Titel: Galactic and Cosmic Evolution constrai ned by Chemical Enrichment Speaker: Dr. Eda Gjergo\, Nanjing University Gra vitational lensing provides a powerful probe of the global mass properties of galaxies\, which are best tested using observations at extremely high an gular resolution. In addition\, through detailed observations of […] X-ALT-DESC;FMTTYPE=text/html:

      Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium

      Ti tel: Galactic and Cosmic Evolution constrained by Chemical Enrichment

      Speaker: Dr. Eda Gjergo\, Nanjing University

      Gravitational lensing p rovides a powerful probe of the global mass properties of galaxies\, which are best tested using observations at extremely high angular resolution. In addition\, through detailed observations of the lensed images\, it is poss ible to place tight constraints on the nature of dark matter through measur ing the abundance and properties of low mass haloes via their subtle gravit ational lensing signal. Here\, we first present new observations with the V LA and HSA to better understand the source of so-called flux-ratio anomalie s in four image gravitational lenses\, which historically provided the firs t constraints on CDM using lensing studies. Next\, we will present the anal ysis of the mass properties of ten massive elliptical galaxies at intermedi ate redshifts\, by combining gravitational lensing and the sensitivity and resolving power of the Atacama Large Millimetre Array (ALMA) and global Ver y Long Baseline Interferometry (radio VLBI). Using imaging at 25 to a few m illi-arcsecond resolution\, we find that complex mass models with angular s tructure are strongly favoured by the data. In addition\, such observations are sensitive to small-scale structure either in the lens or along the lin e-of-sight to the background source. From such an analysis of the data from global VLBI observations\, we detect of a low mass (million solar mass) da rk object\, whose properties are inconsistent with a dark matter halo from either cold or warm dark matter models\, but may be in agreement with more exotic models\, like self-interacting dark matter. Finally\, we present a b rief overview of future studies using the SKA and a likely African VLBI fac ility that includes the SKAMPI\, MPG-DZA and AMT dishes. Throughout we will also provide some asides on the pc-scale structure of radio jets\, constra ints on galactic-scale magnetic fields and electron densities\, and the sup er-resolved (about 10 to 20 pc-scale) properties of starburst galaxies at r edshifts 1 to 4.

      CATEGORIES:Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mpifraifa-m ain-colloquium-speaker-dr-eda-gjergo/ END:VEVENT BEGIN:VEVENT UID:20260207T2204Z-1770501875.4785-EO-15070-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20260202T113937Z LAST-MODIFIED:20260202T113937Z DTSTART;TZID=Europe/Berlin:20260306T110000 DTEND;TZID=Europe/Berlin:20260306T123000 SUMMARY: MPIfR/AIfA Main Colloquium\, Speaker: Professor Dhruba Saikia DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium Titel: Active galaxies: a radio and gamma-ray perspective Speaker: Professor Dhruba Saikia\, Tata Institute of Fundament al Research\, Pune\, India Active galaxies\, which include both starburst g alaxies and active galactic nuclei (AGN)\, are among the most enigmatic obj ects in our Universe. They emit across the electromagnetic […] X-ALT-DESC;FMTTYPE=text/html:

      Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium

      Ti tel: Active galaxies: a radio and gamma-ray perspective

      Speaker: Prof essor Dhruba Saikia\, Tata Institute of Fundamental Research\, Pune\, India

      Active galaxies\, which include both starburst galaxies and active g alactic nuclei (AGN)\, are among the most enigmatic objects in our Universe . They emit across the electromagnetic spectrum and there is also increasin g evidence of detection of neutrinos from some of them. This presentation w ill briefly introduce the different kinds of active galaxies\, and discuss their emission at the highest energies\, namely gamma rays\, along with the ir radio properties. Although the bulk of the extragalactic gamma ray sourc es have been observed to be associated with blazars\, which are believed to have their jets inclined at small angles to the line of sight\, a wide and rich variety of active galaxies in significant numbers have been found to be associated with gamma ray sources in recent years. Some of these recent results and their implications will be discussed.

      CATEGORIES:Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mpifraifa-m ain-colloquium-speaker-professor-dhruba-saikia/ END:VEVENT BEGIN:VEVENT UID:20260305T1238Z-1772714281.3537-EO-15075-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20260303T180922Z LAST-MODIFIED:20260303T180958Z DTSTART;TZID=Europe/Berlin:20260309T140000 DTEND;TZID=Europe/Berlin:20260309T160000 SUMMARY: PhD colloquium: Suryarao Bethapudi DESCRIPTION: PhD colloquium\, location: MPIfR\, Bonn Suryarao Bethapudi Col ors and shapes of light from the Fast Radio Burst 20180916B Abstract: Fast Radio Bursts (FRBs) are millisecond duration\, finite bandwidth (~100s of M Hz) radio transients. This doctoral colloquium\, in particular\, describes the high frequency (around 5 GHz) and polarimetric studies conducted for a peculiar repeating Fast Radio Burst […] X-ALT-DESC;FMTTYPE=text/html:

      PhD colloquium\, location: MPIfR\, Bonn

      Suryarao Bethapudi

      Colors and shapes of light from the Fast Radio Burst 20180916B

      Abstract:

      Fast Radio B ursts (FRBs) are millisecond duration\, finite bandwidth (~100s of MHz) rad io transients. This doctoral colloquium\, in particular\, describes the hig h frequency (around 5 GHz) and polarimetric studies conducted for a peculia r repeating Fast Radio Burst source (FRB 20180916B) that emits bursts only within specific time windows that themselves repeat every 16.34 days. The h igh frequency study\, done using 100 metre Effelsberg Radio Telescope in 4- 6 GHz\, yielded the first high frequency detection of bursts and confirmed the frequency dependency of the active windows that was only observed at lo w frequencies (<1 GHz). This behavior is termed as chromaticity and finds t he active windows to arrive early and shrink with increasing observing freq uency. The polarimetric studies were conducted using upgraded Giant Metrewa ve Radio Telescope in 550-750 MHz band\, and focused on tracking Rotation M easure (RM) and Polarization Position Angle (PA) variability. The RM is see n to vary in a step-like fashion with two epochs of non-variability between an epoch of variability where the RM varies linearly. The PAs of bursts ob served within an four hour window do not vary more than 7 degrees suggestin g no significant PA variability on seconds to minutes timescales. The PA va riabilities within an active window and across active windows at the same p hase are also probed\, but are only treated as preliminary at this point. T he observed PA variability is used to test dynamical models that explain ac tive window periodicity. The non variability of PA on minutes-hours timesca les is shown to rule out precession based models where precessional periodi city explains the active window periodicity. The need for measuring the lon g term PA variability is made explicit by highlighting the constraints that can be placed by them. Lastly\, the FRB source and an intermediate X-ray b inary source\, Her X 1\, are qualitatively compared and their similarities are highlighted.

      CATEGORIES:Thesis Defense ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/phd-colloqu ium-suryarao-bethapudi/ END:VEVENT BEGIN:VEVENT UID:20260317T1924Z-1773775479.91-EO-15078-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20260316T114627Z LAST-MODIFIED:20260316T114627Z DTSTART;TZID=Europe/Berlin:20260320T110000 DTEND;TZID=Europe/Berlin:20260320T123000 SUMMARY: MPIfR/AIfA Main Colloquium\, Speaker: Dr. Nataliya Porayko DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium Titel: Chasing Obscure Matter with Pulsar Exp eriments Speaker: Dr. Nataliya Porayko\, MPI for Radio Astronomy Pulsars\, which are very rapidly spinning neutron stars\, can be instrumental in solv ing the puzzle\, which has perplexed the minds of the scientific community for almost a century – dark […] X-ALT-DESC;FMTTYPE=text/html:

      Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium

      Ti tel: Chasing Obscure Matter with Pulsar Experiments

      Speaker: Dr. Nata liya Porayko\, MPI for Radio Astronomy

      Pulsars\, which are very rapid ly spinning neutron stars\, can be instrumental in solving the puzzle\, whi ch has perplexed the minds of the scientific community for almost a century – dark matter (DM). In the talk I will mainly focus on the light DM candid ates that can be searched for in pulsar observables. The ultralight scalar field DM (also known as "fuzzy" DM)\, consisting of bosons with extremely l ow masses of m ∼ $10^{−22}$ eV\, solves some of the problems of the convent ional cold DM hypothesis. It was shown by Khmelnitsky and Rubakov (2014) th at such DM in the Milky Way induces oscillating gravitational potentials\, leaving characteristic imprints in the time of arrivals of radio pulses fro m pulsars. In addition\, the coupling of axion-like particles to photons al ters the polarization properties of light\, i.e. the plane of polarization of linearly polarized beam propagating through the axion field starts to os cillate with typical frequencies of $10^{-8}$ – $10^{-5}$ Hz (Ivanov et al 2019\, Castillo et al. 2022). Searches for these two effects were performed in the data of the European Pulsar Timing Array (EPTA)\, and stringent con straints on the DM density and coupling constant between photons and axion- like particles have been set. In addition\, traces of QCD axions with masse s of around ~ mu eV can be searched for with the spectroscopic observations of pulsars. We discuss the systematics and artifacts in pulsar data that c an mimic the signal of interest and possible methods to avoid the existing biases. I will conclude with other possible probes for new physics that can be performed with pulsar experiments in the nearest future.

      CATEGORIES:Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mpifraifa-m ain-colloquium-speaker-dr-nataliya-porayko/ END:VEVENT BEGIN:VEVENT UID:20260207T2204Z-1770501875.4842-EO-15071-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20260202T120837Z LAST-MODIFIED:20260202T121150Z DTSTART;TZID=Europe/Berlin:20260323T090000 DTEND;TZID=Europe/Berlin:20260323T120000 RDATE;TZID=Europe/Berlin:20260324T090000,20260325T090000,20260326T090000,20260330T090000,20260331T090000,20260401T090000,20260402T090000 SUMMARY: Black Board Lectures “Introduction to dimensional analysis and sel f-similarity”\, by Prof. Anvar Shukurov DESCRIPTION: Introduction to dimensional analysis and self-similarity Daily occurence from March 23 to April 2 with lectures and tutorials. X-ALT-DESC;FMTTYPE=text/html:

      Introduction to d imensional analysis and self-similarity

      Daily occurence from March 23 to April 2 with lectures and tutorials.

      CATEGORIES:Blackboard ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/black-board -lectures-by-prof-anvar-shukurov/ END:VEVENT BEGIN:VEVENT UID:20260317T1924Z-1773775479.9218-EO-15079-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20260316T115321Z LAST-MODIFIED:20260316T115321Z DTSTART;TZID=Europe/Berlin:20260327T110000 DTEND;TZID=Europe/Berlin:20260327T123000 SUMMARY: MPIfR/AIfA Main Colloquium\, Speaker: Professor Anvar Shukurov DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium Titel: Turbulence\, outflows\, magnetic field s and cosmic rays in the multi-phase interstellar medium Speaker: Prof. Anv ar Shukurov\, University of Newcastle\, UK We explore the multi-phase struc ture and turbulence formed by supernova activity in a spiral galaxy. Parame ter values are typical of the Solar neighbourhood of […] X-ALT-DESC;FMTTYPE=text/html:

      Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium

      Ti tel: Turbulence\, outflows\, magnetic fields and cosmic rays in the multi-p hase interstellar medium

      Speaker: Prof. Anvar Shukurov\, University o f Newcastle\, UK

      We explore the multi-phase structure and turbulence formed by supernova activity in a spiral galaxy. Parameter values are typic al of the Solar neighbourhood of the Milky Way\, but we consider how the sy stem changes as the supernova rate increases by a factor of ten in comparis on with the Milky Way value. Our local three-dimensional non-ideal MHD simu lations with cosmic rays include the effects of galactic differential rotat ion\, density stratification\, compressibility\, magnetic fields\, heating via supernova explosions and parametrised radiative cooling. Of particular focus is the dependence of the system properties and its multiphase structu re on the supernova rate. We show that the turbulent velocity in the warm g as varies very little with the supernova rate\, remaining transonic\, while the cold and hot gas are more strongly affected. However\, the turbulence remains transonic or subsonic on all three phases. The interstellar phase b oundaries in the pressure-temperature plane (equivalently\, in terms of the gas specific entropy) vary weakly with the supernova rate\, but the outflo w speed increases significantly. The filling fraction of the hot gas increa se systematically and significantly with the supernova rate\, with the warm gas volume fraction decreasing and the cold gas remaining largely unchange d. The increase in the fractional volume of the hot gas\, rather than an en hancement of the turbulent speed\, explains the increase in the spectral li ne widths with the star formation rate. Both magnetic fields and cosmic ray s reduce the density contrast between the phases\, making the interstellar gas less inhomogeneous. The turbulent magnetic field strength increases acr oss all phases as the supernova rate increases\, but the mean field is weak ened significantly. Cosmic ray energy density scales linearly with the supe rnova rate in all phases. Because of the large diffusivity of cosmic rays\, their scale height is quite large\, so its contribution to driving the gas outflow is only marginal.

      CATEGORIES:Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mpifraifa-m ain-colloquium-speaker-professor-anvar-shukurov/ END:VEVENT BEGIN:VEVENT UID:20260207T2204Z-1770501875.4911-EO-15072-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20260202T121054Z LAST-MODIFIED:20260202T121140Z DTSTART;TZID=Europe/Berlin:20260327T133000 DTEND;TZID=Europe/Berlin:20260327T160000 SUMMARY: Black Board Lectures “Introduction to dimensional analysis and sel f-similarity”\, by Prof. Anvar Shukurov DESCRIPTION: Introduction to dimensional analysis and self-similarity Daily occurence from March 23 to April 2 with lectures and tutorials. X-ALT-DESC;FMTTYPE=text/html:

      Introduction to d imensional analysis and self-similarity

      Daily occurence from March 23 to April 2 with lectures and tutorials.

      CATEGORIES:Blackboard ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/black-board -lectures-by-prof-anvar-shukurov-2/ END:VEVENT BEGIN:VEVENT UID:20260401T2303Z-1775084632.8049-EO-15086-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20260330T172102Z LAST-MODIFIED:20260330T172102Z DTSTART;TZID=Europe/Berlin:20260414T140000 DTEND;TZID=Europe/Berlin:20260414T153000 SUMMARY: PhD colloquium: Thanh Dat Hoang DESCRIPTION: PhD colloquium\, location: MPIfR\, Bonn Thanh Dat Hoang Warm i nner envelopes of massive star-forming regions Abstract: High-mass stars pl ay crucial roles in the evolution of galaxies\, but their formation process is still not fully understood. Our work investigates this topic by studyin g the warm inner gas envelopes around high-mass star-forming regions in the Top100 sample\, selected […] X-ALT-DESC;FMTTYPE=text/html:

      PhD colloquium\, location: MPIfR\, Bonn

      Thanh Dat Hoang

      Warm inner envelopes of massive st ar-forming regions

      Abstract:

      High-mass stars play cruc ial roles in the evolution of galaxies\, but their formation process is sti ll not fully understood. Our work investigates this topic by studying the w arm inner gas envelopes around high-mass star-forming regions in the Top100 sample\, selected from the brightest cold dust clumps in the unbiased ATLA SGAL survey in the Milky Way. Using mid- and high-J transitions of CO and i ts rare isotopologues 13CO and C18O\, the work probes the morphology and ki nematic properties of these envelopes across different evolutionary stages. Observing such lines is traditionally difficult\, but it becomes more feas ible in this work thanks to the advancement of technology at the APEX/CHAMP + and SOFIA/GREAT instruments. The 13CO(6-5) data obtained with APEX/CHAMP+ reveal correlations between emission and clump properties\, indicating tha t the excitation of this line\, which traces the warm envelopes\, increases with the evolution of star formation. Envelope morphology\, as revealed by 13CO(6-5) integrated intensity maps\, appears mostly as a single core in a ll evolutionary stages\, indicating either that the shapes of the envelopes do not evolve with star formation\, or that higher angular resolutions obs ervations are needed to resolve such transformations. Radial intensity grad ients of the 13CO(6-5) emission are well described by power-law functions\, with steeper slopes at evolved stages suggesting rising gas temperature an d/or density at the source centre. The envelope kinematics\, however\, are complex and could be driven by multiple processes such as outflow entrainme nt\, envelope rotation\, or inherited motions from larger-scale envelopes. Spectra of high-J CO(11-10) and CO(16-15) lines obtained with SOFIA/GREAT r eveal broad wing emission\, which we were able to extract. The wing emissio n appears already in young sources\, suggesting the early existence of outf lows in high-mass star formation. Radiative transfer modelling with RADEX s uggests that shocks are responsible for the excitation of the gas producing the wing emission.

      CATEGORIES:Thesis Defense ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/phd-colloqu ium-thanh-dat-hoang/ END:VEVENT BEGIN:VEVENT UID:20260415T1707Z-1776272862.6614-EO-15089-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20260414T134614Z LAST-MODIFIED:20260414T134614Z DTSTART;TZID=Europe/Berlin:20260416T110000 DTEND;TZID=Europe/Berlin:20260416T123000 SUMMARY: PhD colloquium: Iason Skretas DESCRIPTION: PhD colloquium\, location: MPIfR\, Bonn Iason Skretas Warm inn er envelopes of massive star-forming regions Abstract: “Protostellar outflo ws mark one of the earliest\, and most prominent signs of star formation\, and have been detected in both low- and high-mass sources. Protostellar out flows are considered a key part of the process due to their ability to remo ve excess […] X-ALT-DESC;FMTTYPE=text/html:

      PhD colloquium\, location: MPIfR\, Bonn

      Iason Skretas

      Warm inner envelopes of massive star -forming regions

      Abstract:

      "Protostellar outflows mark one of the earliest\, and most prominent signs of star formation\, and hav e been detected in both low- and high-mass sources. Protostellar outflows a re considered a key part of the process due to their ability to remove exce ss angular momentum from the protostar-disk system\, which enables the accr etion of material. They are typically observed via molecular transitions at radio wavelengths\, but are also bright in shock excited transitions in th e IR regime. Due to their close connection to the accretion process\, under standing protostellar outflows is crucial in order to fully describe the fo rmation of stars. Throughout this thesis\, I aimed to investigate protostel lar outflows in both the mm and IR regime\, in order to investigate several of the open questions regarding their nature with a particular focus is pl aced on the impact of the large-scale environment onto the outflows and usi ng observations from the NOEMA and IRAM 30m telescopes\, as well as\, obser vations from the JWST MIRI/MRS instrument. In the first part of this thesis \, I studied the outflow activity along the entire DR21 filament\, one of t he most active\, high-mass star-forming regions in the Galaxy. Using the HC O$^+$ $J=1-0$\, H$^{13}$CO$^+$ $J=1-0$\, and SiO $J=2-1$ observations of th e region\, taken as part of the CASCADE project\, I aimed to identify all p rotostellar outflows associated with dense molecular clumps along the DR21 ridge and estimate their physical and energetic properties. By comparing th e properties of such a sample with the established correlations between out flow and source properties allowed me to investigate whether the extreme na ture of the DR21 filament has any impact onto the outflows\, and by extensi on the formation\, of its sources. The results showed no clear connection b etween environment and outflow activity\, with the sources in DR21 being in distinguishable to those of an extended literature sample. Notable exceptio n is the outflow of DR21 Main. Subsequently\, I take advantage of the uniqu e capabilities of the JWST\, to investigate the inner workings of protostel lar outflows. Namely\, I study the shock excited transitions of H$_2$ along with various atomic and ionic transitions available in the MIRI range for a sample of 5 low-mass protostars in Ophiuchus. My aim with this analysis i s to investigate the origin of this shock excitation\, through comparisons of the observations with UV irradiated shock models. The analysis revealed the significant contribution of UV emission within these outflows. I found that the origin of this UV emission has to been from within the protostella r outflows themselves\, and not from the external environment. Overall\, I analyzed outflows from sources across the entire mass regime\, using observ ations in both the mm and IR regime. Throughout the multiple individual res ults of each project\, my analysis showed that the properties of the large scale environment surrounding a forming protostar have little to no influen ce on the properties of its protostellar outflow. My results therefore sugg est that the star formation process is primarily dictated from small scale processes\, taking place within the star forming cores\, and not impacted b y the more extended environment."

      CATEGORIES:Thesis Defense ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/phd-colloqu ium-iason-skretas/ END:VEVENT BEGIN:VEVENT UID:20260423T1018Z-1776939537.9969-EO-15098-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20260423T100358Z LAST-MODIFIED:20260423T100358Z DTSTART;TZID=Europe/Berlin:20260424T110000 DTEND;TZID=Europe/Berlin:20260424T123000 SUMMARY: MPIfR/AIfA Main Colloquium\, Speaker: Professor Anna Nelles DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium Titel: Particles of the highest energies in j ust a few nanoseconds — Opportunities in radio detection of cosmic particle s Speaker: Professor Anna Nelles\, Erlangen Centre for Astroparticle Physic s Cosmic particles such as nuclei and neutrinos populate the Universe from highly abundant solar wind particles to […] X-ALT-DESC;FMTTYPE=text/html:

      Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium

      Ti tel: Particles of the highest energies in just a few nanoseconds -- Opportu nities in radio detection of cosmic particles

      Speaker: Professor Anna Nelles\, Erlangen Centre for Astroparticle Physics

      Cosmic particles such as nuclei and neutrinos populate the Universe from highly abundant sol ar wind particles to rare cosmic rays of energies exceeding what we can cre ate on Earth. These latter particles are so rare that one needs detectors o f several square kilometers in size to measure a meaningful number of them on Earth\; a challenging experimental effort. When interacting at Earth\, c osmic rays are typically detected with dedicated particle detectors or Cher enkov telescopes. However\, it was been know for several decades that they also create measurable radio pulses. I will elaborate on our quest to detec t cosmic particles with the new generation of array based radio telescopes such as LOFAR and SKA-Low\, as well as dedicated radio neutrino experiments in the ice of Greenland and Antarctica.

      CATEGORIES:Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mpifraifa-m ain-colloquium-speaker-professor-anna-nelles/ END:VEVENT BEGIN:VEVENT UID:20260415T1707Z-1776272862.6696-EO-15090-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20260414T154756Z LAST-MODIFIED:20260414T154756Z DTSTART;TZID=Europe/Berlin:20260424T153000 DTEND;TZID=Europe/Berlin:20260424T170000 SUMMARY: PhD colloquium: Vieri Bartolini DESCRIPTION: PhD colloquium\, location: Ph1\, Cologne Vieri Bartolini Accre tion mode\, jet structure and γ-ray emission in misaligned AGN Abstract: Th is thesis investigates the physical connection between accretion processes and relativistic jet properties in radio-loud active galactic nuclei (AGN)\ , with emphasis on misaligned AGN (MAGN). By combining multi-frequency VLBI observations up to 88 GHz with long-term γ-ray monitoring […] X-ALT-DESC;FMTTYPE=text/html:

      PhD colloquium\, location: Ph1\, Cologne

      Vieri Bartolini

      Accretion mode\, jet structure and γ-ray emission in misaligned AGN

      Abstract:

      This thesis investigates the physical connection between accretion processes an d relativistic jet properties in radio-loud active galactic nuclei (AGN)\, with emphasis on misaligned AGN (MAGN). By combining multi-frequency VLBI o bservations up to 88 GHz with long-term γ-ray monitoring from the Fermi Lar ge Area Telescope and ancillary multiwavelength data\, this work explores h ow different accretion regimes influence jet magnetization\, internal struc ture\, and high-energy variability. Growing observational evidence indicate s that the excitation class and accretion mode play a fundamental role in s haping jet dynamics and radiative behaviour. Therefore\, we explore the dic hotomy between High-Excitation Galaxies (HEGs)\, associated with radiativel y efficient thin disks\, and Low-Excitation Galaxies (LEGs)\, typically pow ered by radiatively inefficient accretion flows. MAGN provide an ideal labo ratory for this investigation because relativistic and projection effects a re reduced\, allowing VLBI observations to probe the compact jet base where high-energy emission is expected to originate. A detailed polarimetric ana lysis of the HEG radio galaxy 3C 111 reveals a complex magnetized parsec-sc ale jet. Spectral and rotation-measure mapping identify an optically thick feature located approximately 1–2 parsecs from the core that is co-spatial with extremely high Faraday rotation\, suggesting an interaction between th e jet and a dense clumpy torus cloud. Farther downstream\, a significant tr ansverse RM gradient provides strong evidence for a helical magnetic field. These results indicate that the jet in 3C 111 is still strongly magnetized on parsec scales and propagates in a dense environment\, possibly providin g dense external photon fields for γ-ray production through inverse Compton . The role of the accretion regime is further explored through a comparativ e multi-epoch and multi-wavelength analysis of the HEG 3C 111 and the LEG 3 C 371\, two MAGN with similar global properties but markedly different Eddi ngton ratios. The HEG 3C 111 is dominated by superluminal moving knots and is detected in γ-rays primarily during major flares associated with the eje ction of new jet features. In contrast\, the LEG 3C 371 exhibits predominan tly stationary structures that may act as persistent particle acceleration sites\, producing steadier high-energy emission. The observed RM evolution and jet kinematics suggest that stronger disk winds in HEGs may stabilize a relativistic spine through mass loading of an outer sheath\, whereas weake r winds in LEGs favor the formation of standing recollimation shocks. We pr opose that the link between accretion mode and jet properties is driven by differences in disk winds: radiatively efficient HEGs produce strong winds that stabilize the spine–sheath jet\, enabling extended acceleration and su perluminal features\, while weaker winds in LEGs leave the spine more unsta ble\, favoring stationary recollimation shocks. Extending the analysis to a sample of nine nearby Fermi-LAT-detected MAGN reveals differences between HEGs and LEGs in core brightness temperatures and variability patterns. HEG cores tend to approach the inverse-Compton limit and exhibit a higher prob ability of strong γ-ray flaring\, while LEG cores remain closer to equipart ition and display more persistent\, lower-amplitude emission. Limb-brighten ing\, possibly indicative of a spine-sheath velocity stratification\, is ob served in three of the four LEGs\, as well as in the closest HEG\, suggesti ng that the less frequent detection of this feature in HEGs may be due to t heir average larger distances\, resulting in insufficient spatial resolutio n in VLBI imaging. The results of this thesis support a unified scenario in which the accretion mode is a primary driver of jet internal structure\, s tability\, and high-energy dissipation. The work provides a framework for f uture large-sample radio–γ studies and offers observational constraints for relativistic magnetohydrodynamic simulations of disk–jet coupling in radio -loud AGN.

      CATEGORIES:Thesis Defense ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/phd-colloqu ium-vieri-bartolini/ END:VEVENT BEGIN:VEVENT UID:20260402T1658Z-1775149118.3933-EO-15088-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20260402T135230Z LAST-MODIFIED:20260402T135230Z DTSTART;TZID=Europe/Berlin:20260429T130000 DTEND;TZID=Europe/Berlin:20260429T143000 SUMMARY: PhD colloquium: Kartik Rajan Neralwar DESCRIPTION: PhD colloquium\, location: MPIfR\, Bonn Kartik Rajan Neralwar Tracing the effects of stellar feedback on molecular gas from simulations t o observations Abstract: The interstellar medium (ISM) is a turbulent\, mul ti-phase medium with a hierarchical structure consisting of molecular cloud s (MCs)\, clumps\, and cores. Stars form in dense cores and\, over their ev olution\, inject mass\, momentum\, and […] X-ALT-DESC;FMTTYPE=text/html:

      PhD colloquium\, location: MPIfR\, Bonn

      Kartik Rajan Neralwar

      Tracing the effects of stell ar feedback on molecular gas from simulations to observations

      < p>Abstract:

      The interstellar medium (ISM) is a turbulent\, multi-phas e medium with a hierarchical structure consisting of molecular clouds (MCs) \, clumps\, and cores. Stars form in dense cores and\, over their evolution \, inject mass\, momentum\, and energy back into the ISM through stellar fe edback processes. I will present a systematic study of the interactions bet ween stellar feedback and molecular gas structures across different spatial scales and evolutionary stages\, using the STARFORGE simulations. These si mulations follow the evolution of individual giant molecular clouds\, while self-consistently modelling protostellar outflows\, stellar winds\, radiat ion and supernovae. I will begin by examining the impact of individual feed back mechanisms on high-resolution gas cores identified in the simulated ga s density maps. I will then describe the use synthetic 13CO observations to study the evolution of MCs under the influence of stellar feedback as they would appear in observational surveys such as SEDIGISM. Following this\, I will introduce a new pipeline developed to track clumps over time capturin g their changes\, fragmentation and mergers. Finally\, I will present deep- learning based results demonstrating how neural networks trained on synthet ic data can identify feedback signatures in real observations. Together\, t hese projects provide a framework for interpreting observed trends in the m olecular cloud properties\, identifying the observational signatures of ste llar feedback in molecular gas\, and tracing the time evolution of molecula r gas structures in galaxies.

      CATEGORIES:Thesis Defense ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/phd-colloqu ium-kartik-rajan-neralwar/ END:VEVENT BEGIN:VEVENT UID:20260415T1707Z-1776272862.6779-EO-15094-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20260415T162406Z LAST-MODIFIED:20260415T162406Z DTSTART;TZID=Europe/Berlin:20260430T110000 DTEND;TZID=Europe/Berlin:20260430T123000 SUMMARY: PhD colloquium: Shilpa Ranchod DESCRIPTION: PhD colloquium\, location: MPIfR\, Bonn Shilpa Ranchod Charact erising the broadband polarisation properties of extragalactic radio source s at 3 GHz Abstract: Magnetic fields are ubiquitous in the Universe and pla y a key role in galaxy evolution\, influencing star formation\, cosmic-ray transport\, and feedback. Radio polarisation observations provide a powerfu l probe of cosmic magnetic fields through Faraday rotation. […] X-ALT-DESC;FMTTYPE=text/html:

      PhD colloquium\, location: MPIfR\, Bonn

      Shilpa Ranchod

      Characterising the broadband polari sation properties of extragalactic radio sources at 3 GHz

      Ab stract:

      Magnetic fields are ubiquitous in the Universe and play a key role in galaxy evolution\, influencing star formation\, cosmic-ray transpo rt\, and feedback. Radio polarisation observations provide a powerful probe of cosmic magnetic fields through Faraday rotation. Large samples of polar ised radio galaxies enable rotation measure (RM) grids that trace both extr agalactic sources and the magnetised interstellar medium of the Milky Way. As modern interferometers push to µJy sensitivities and dramatically increa se RM grid densities\, interpreting these measurements requires a better un derstanding of both foreground Faraday effects and the faint polarised sour ce population. This thesis addresses two key aspects for improving RM grid interpretation: (i) the observational biases and physical origins of Farada y complexity at low Galactic latitudes\, and (ii) the nature of the extraga lactic polarised source population. Using broadband spectro-polarimetric AT CA observations of polarised extragalactic sources\, I show that the observ ed increase in Faraday complexity toward low Galactic latitudes in the SPAS S/ATCA catalogue is largely driven by contamination from diffuse Galactic p olarised emission. Our relatively higher-resolution observations allow this contamination to be filtered out\, revealing that 42% of sources still sho w Faraday complexity. We find this complexity to be consistent with turbule nt injection scales in the Galactic spiral arms and toward the Galactic cen tre. In addition\, I present the linear polarisation component of the VLA-C OSMOS 3 GHz survey\, yielding the deepest polarised source counts (2.6 µJy/ beam) at this frequency to date. Through these broadband observations\, we identify the dominant depolarisation mechanisms in this sample and model th e frequency dependence of polarised source counts. Furthermore\, these resu lts show that even the µJy polarised sky is dominated by active galactic nu clei\, with no detection of star-forming galaxies\, implying that significa ntly deeper observations will be required to probe this population\, even a t higher frequencies.

      CATEGORIES:Thesis Defense ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/phd-colloqu ium-shilpa-ranchod/ END:VEVENT BEGIN:VEVENT UID:20260507T0347Z-1778125673.7455-EO-15101-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20260504T104512Z LAST-MODIFIED:20260504T104512Z DTSTART;TZID=Europe/Berlin:20260507T090000 DTEND;TZID=Europe/Berlin:20260507T103000 SUMMARY: PhD colloquium: Anna Pugno DESCRIPTION: PhD colloquium\, location: MPIfR\, Bonn Anna Pugno The Galaxy Three-Point Correlation Function: From Theory to Forecasts Abstract: The th ree-point correlation function (3PCF) is a powerful probe of large-scale st ructure\, capturing non-Gaussian information beyond standard two-point stat istics. With upcoming surveys like Euclid\, exploiting this observable requ ires accurate and efficient modelling of redshift-space distortions (RSDs)\ , which remains challenging. […] X-ALT-DESC;FMTTYPE=text/html:

      PhD colloquium\, location: MPIfR\, Bonn

      Anna Pugno

      The Galaxy Three-Point Correlation Func tion: From Theory to Forecasts

      Abstract:

      The three-poi nt correlation function (3PCF) is a powerful probe of large-scale structure \, capturing non-Gaussian information beyond standard two-point statistics. With upcoming surveys like Euclid\, exploiting this observable requires ac curate and efficient modelling of redshift-space distortions (RSDs)\, which remains challenging.
      In this talk\, I present a study of two key mode lling approaches\, the Gaussian Streaming Model (GSM) and Standard Perturba tion Theory (SPT)\, using N-body simulations. I show that GSM achieves high er accuracy on mildly nonlinear scales when supplied with accurate velocity statistics\, while SPT is computationally efficient but breaks down on sma ll scales. Their convergence at large scales motivates hybrid modelling str ategies.
      I then present a joint analysis of the 2PCF and 3PCF using Eu clid-like mock galaxy catalogues. Including the 3PCF significantly improves constraints on cosmological and bias parameters\, particularly by breaking degeneracies.
      Overall\, this work demonstrates both the promise and t he challenges of incorporating the 3PCF into next-generation cosmological a nalyses.

      CATEGORIES:Thesis Defense ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/phd-colloqu ium-anna-pugno/ END:VEVENT BEGIN:VEVENT UID:20260520T1846Z-1779302766.2929-EO-15124-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20260518T135416Z LAST-MODIFIED:20260518T135416Z DTSTART;TZID=Europe/Berlin:20260522T110000 DTEND;TZID=Europe/Berlin:20260522T123000 SUMMARY: MPIfR/AIfA Main Colloquium\, Speaker: Prof. Franco Vazza DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium Titel: Clues on the origin of cosmic magnetis m from large-scale structures Speaker: Prof. Franco Vazza\, University of B ologna\, Italy The origin of magnetic fields measured out to several Megapa rsec from the centre of clusters of galaxies is not obvious\, and can eithe r be ascribed to […] X-ALT-DESC;FMTTYPE=text/html:

      Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium

      Ti tel: Clues on the origin of cosmic magnetism from large-scale structures

      Speaker: Prof. Franco Vazza\, University of Bologna\, Italy

      The o rigin of magnetic fields measured out to several Megaparsec from the centre of clusters of galaxies is not obvious\, and can either be ascribed to pri mordial\, or astrophysical processes (or a combination of both). I will rev iew the most updated results on the observational quests to detect magnetic fields on very large scales with radio telescopes\, and show how the combi nation with modern cosmological simulations can suggest a plausible answer to the puzzle. I will also discuss the upcoming science which might become possible thanks to the advent of the Square Kilometre Array\, and in combin ation with other powerful observational probes.

      CATEGORIES:Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mpifraifa-m ain-colloquium-speaker-prof-franco-vazza/ END:VEVENT BEGIN:VEVENT UID:20260527T1236Z-1779885398.848-EO-15126-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20260526T153918Z LAST-MODIFIED:20260526T153918Z DTSTART;TZID=Europe/Berlin:20260610T150000 DTEND;TZID=Europe/Berlin:20260610T170000 SUMMARY: PhD colloquium: Sarwar Khan DESCRIPTION: PhD colloquium\, location: MPIfR\, Bonn Sarwar Khan Physical a nd chemical characterization of Galactic HII regions Abstract: Abstract: Hi gh-mass stars (> 8 Msun) play a vital role in shaping galaxies and the inte rstellar medium (ISM) through their intense radiation\, stellar winds\, and eventual supernova explosions. Yet\, key questions about how they form\, i nfluence their surroundings\, and regulate […] X-ALT-DESC;FMTTYPE=text/html:

      PhD colloquium\, location: MPIfR\, Bonn

      Sarwar Khan

      Physical and chemical characterization of Galactic HII regions

      Abstract:

      Abstract: High-mass stars (> 8 Msun) play a vital role in shaping galaxies and the interstella r medium (ISM) through their intense radiation\, stellar winds\, and eventu al supernova explosions. Yet\, key questions about how they form\, influenc e their surroundings\, and regulate future star formation remain open. Stud ying these stars is challenging as they are rare\, short-lived\, and form d eep inside dusty\, distant clouds. Statistical\, unbiased surveys are there fore essential\, and recent technological advances have made this possible. The first part of this talk presents a blind search for HII regions — ioni zed regions created by the intense ultraviolet radiation of high mass stars — conducted using radio recombination line and continuum emission from the GLObal view on STAR formation (GLOSTAR) survey. This analysis cataloged 24 4 Galactic HII regions and derived their physical properties and associatio ns with mid infrared and dust emission to shed light on their evolution. To probe how high mass stars influence their natal environments\, we investig ated molecular gas properties as traced by H2CO (an important densitometer and thermometer) transitions. While the bulk of the H2CO emission arises fr om the background source\, several targets exhibit multiple components. The secondary components typically showcase broader linewidth tracing higher t emperatures\, indicative of supersonic\, nonthermal motions and turbulent g as probing HII region feedback. Together\, these results attempt to provide a comprehensive view of high mass star formation\, linking the properties of HII regions and their molecular environments across Galactic scales.

      CATEGORIES:Thesis Defense ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/phd-colloqu ium-sarwar-khan/ END:VEVENT BEGIN:VEVENT UID:20260601T2210Z-1780351830.7774-EO-15127-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20260601T155625Z LAST-MODIFIED:20260601T155625Z DTSTART;TZID=Europe/Berlin:20260612T110000 DTEND;TZID=Europe/Berlin:20260612T123000 SUMMARY: PhD colloquium: Ivalu Barlach Christensen DESCRIPTION: PhD colloquium\, location: MPIfR\, Bonn Ivalu Barlach Christen sen Large-scale physical and molecular conditions in structures of Cygnus-X Abstract: The physical state of the interstellar medium (ISM) is essential for understanding the intricate processes involved in massive star formati on within galaxies. The nearby (d about 1.5 kpc) molecular cloud\, Cygnus-X \, harbors multiples sites of high-mass star-formation\, allowing […] X-ALT-DESC;FMTTYPE=text/html:

      PhD colloquium\, location: MPIfR\, Bonn

      Ivalu Barlach Christensen

      Large-scale physical and molecular conditions in structures of Cygnus-X

      Abstract:

      The physical state of the interstellar medium (ISM) is essential for un derstanding the intricate processes involved in massive star formation with in galaxies. The nearby (d about 1.5 kpc) molecular cloud\, Cygnus-X\, harb ors multiples sites of high-mass star-formation\, allowing us to probe the various stages as stars form and how the chemistry evolve. Within the Cygnu s Allscale Survey of Chemistry and Dynamical Environments (CASCADE)\, we ai m to explore the large-scale distribution of deuterated molecules in Cygnus -X. A plethora of star-forming clumps are observed with the CASCADE survey\ , where clumps are believed to evolve from quiescent infrared-dark clouds t o high-mass protostellar objects to hot molecular cores to ultra-compact HI I regions. The most active and dense region within Cygnus-X is the DR21 fil ament\, harboring the prominent Hii region DR21 Main with the most intense outflow of the Milky Way. The degree of deuteration\, R\, can significantly enhance over the elemental D/H-ratio (10^−) depending on physical paramete rs such as temperature\, density\, and ionization fraction. Deuterated mole cules and their molecular D/H-ratios are important diagnostic tools to stud y the physical conditions of star-forming regions. This thesis focuses on p robing the deuterated fractions of Cygnus-X. Along the DR21 filament\, the deuterated fraction of DCO+\, DNC\, and DCN exhibit morphological variation s\, caused by the local physical conditions. Active star-formation along th e filamentary structure initiate shock chemistry in these high density regi on\, destroying DCO+\, and consequently decreasing R(DCO+). Furthermore\, t he lower density regions are exposed to FUV\, in which the formation of HCO + is halted\, consequently increasing the R(DCO+). Finally\, to further und erstand how deuterated fractions behave as clumps evolve\, we investigate 6 7 clumps. Utilizing CASCADE observation of the ubiquitous H2CO complemented with higher J-transitions with the APEX telescope\, we determine the physi cal conditions of 67 clumps in Cygnus-X. The methodology of determining the H2 volume density is efficient in probing the bulk of the gas within 0.2 p c of the clumps. With the physical conditions constrained\, we model the ch emical evolution of these clumps utilizing the plethora of molecules covere d with CASCADE\, including the 6 deuterated fractions. We find that the two deuterated fractions decrease and increase\, respectively\, as the clumps evolve and become hotter.

      CATEGORIES:Thesis Defense ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/phd-colloqu ium-ivalu-barlach-christensen/ END:VEVENT BEGIN:VEVENT UID:20260605T2224Z-1780698253.6776-EO-15131-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20260605T153404Z LAST-MODIFIED:20260605T153404Z DTSTART;TZID=Europe/Berlin:20260612T110000 DTEND;TZID=Europe/Berlin:20260612T123000 SUMMARY: MPIfR/AIfA Main Colloquium\, Speaker: Dr. Jaroslav Haas DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium Titel: On the population of various black hol es in the Galactic centre Speaker: Dr. Jaroslav Haas\, Charles University\, Prague The centre of our Galaxy hosts a supermassive black hole called Sgr A*. Its nature has been tested in various ways and is now considered prove n […] X-ALT-DESC;FMTTYPE=text/html:

      Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium

      Ti tel: On the population of various black holes in the Galactic centre

      Speaker: Dr. Jaroslav Haas\, Charles University\, Prague

      The centre o f our Galaxy hosts a supermassive black hole called Sgr A*. Its nature has been tested in various ways and is now considered proven beyond any reasona ble doubt. The properties of the population of the less massive black holes in this region are\, however\, far less certain. In my talk\, I will prese nt a specific way to probe the distribution of the generally expected stell ar-mass black holes in the innermost fraction of a parsec of the Galactic c entre. For a much larger scale of a few hundred parsec around Sgr A*\, I wi ll then discuss an efficient novel formation channel for the provocatively elusive intermediate-mass black holes.

      CATEGORIES:Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mpifraifa-m ain-colloquium-speaker-dr-jaroslav-haas/ END:VEVENT BEGIN:VEVENT UID:20260605T2224Z-1780698253.6849-EO-15132-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20260605T155021Z LAST-MODIFIED:20260605T155021Z DTSTART;TZID=Europe/Berlin:20260619T110000 DTEND;TZID=Europe/Berlin:20260619T123000 SUMMARY: MPIfR/AIfA Main Colloquium\, Speaker: Professor Ziggy Pleunis DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium Titel: Unraveling the nature of fast radio bu rsts and using them as precise astrophysical tools Speaker: Professor Ziggy Pleunis\, University of Amsterdam Fast radio bursts (FRBs) are one of the most exciting mysteries in contemporary astrophysics. They last only a frac tion of a second but […] X-ALT-DESC;FMTTYPE=text/html:

      Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium

      Ti tel: Unraveling the nature of fast radio bursts and using them as precise a strophysical tools

      Speaker: Professor Ziggy Pleunis\, University of A msterdam

      Fast radio bursts (FRBs) are one of the most exciting myster ies in contemporary astrophysics. They last only a fraction of a second but are bright enough to be detectable from halfway across the Universe. FRBs are unique astrophysical tools: they are perfect point sources\, impulsive\ , and being in the radio band they are also distorted in ways that carry va luable information about otherwise invisible matter\, which makes them unpr ecedented probes of the local environments of compact objects and the struc ture and magnetization of the interstellar and intergalactic media. FRBs wi ll be even more useful when we better understand their sources and emission . A small fraction of FRBs has been observed to repeat\, which has ruled ou t a cataclysmic origin for these sources and allows for detailed multi-wave length follow-up observations that constrain FRB models. It is as-yet uncle ar whether all FRBs repeat and if FRB models based on a few well-studied re peaters can be extrapolated to the full population. Canada's CHIME telescop e has been instrumental in uncovering the diversity of FRBs: it provided th e first large statistical sample of FRBs\, and it is continuing to lead the discovery of repeating sources by revisiting the Northern sky every day. A t the same time\, we have opened a new window into studying these sources b y detecting the lowest-frequency FRBs with the LOFAR telescope. I will argu e that the next revolution in FRB science is imminent through the collectio n of the first large sample of FRBs with known redshifts through the CHIME/ FRB "Outriggers" upgrade. Complemented by observations from LOFAR 2.0 and o ther facilities\, this promises to solve the mystery of FRBs and will uniqu ely address a variety of unsolved problems in astrophysics\, such as the de tection of the "missing" baryons and the impact of feedback on the formatio n of galaxy haloes.

      CATEGORIES:Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mpifraifa-m ain-colloquium-speaker-professor-ziggy-pleunis/ END:VEVENT BEGIN:VEVENT UID:20260415T1707Z-1776272862.6856-EO-15091-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20260414T155854Z LAST-MODIFIED:20260414T155854Z DTSTART;TZID=Europe/Berlin:20260626T110000 DTEND;TZID=Europe/Berlin:20260626T123000 SUMMARY: MPIfR/AIfA Main Colloquium\, Speaker: Prof. John McKean DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium Titel: Testing models for dark matter with ex tremely high angular resolution imaging of galaxy-scale gravitational lense s (and some asides on galaxy formation) Speaker: Prof. John McKean\, Kaptey n Astronomical Institute\, University of Groningen &\; ASTRON\, Dwingel oo\, The Netherlands Gravitational lensing provides a powerful probe of the […] X-ALT-DESC;FMTTYPE=text/html:

      Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium

      Ti tel: Testing models for dark matter with extremely high angular resolution imaging of galaxy-scale gravitational lenses (and some asides on galaxy for mation)

      Speaker: Prof. John McKean\, Kapteyn Astronomical Institute\, University of Groningen & ASTRON\, Dwingeloo\, The Netherlands

      Gravi tational lensing provides a powerful probe of the global mass properties of galaxies\, which are best tested using observations at extremely high angu lar resolution. In addition\, through detailed observations of the lensed i mages\, it is possible to place tight constraints on the nature of dark mat ter through measuring the abundance and properties of low mass haloes via t heir subtle gravitational lensing signal. Here\, we first present new obser vations with the VLA and HSA to better understand the source of so-called f lux-ratio anomalies in four image gravitational lenses\, which historically provided the first constraints on CDM using lensing studies. Next\, we wil l present the analysis of the mass properties of ten massive elliptical gal axies at intermediate redshifts\, by combining gravitational lensing and th e sensitivity and resolving power of the Atacama Large Millimetre Array (AL MA) and global Very Long Baseline Interferometry (radio VLBI). Using imagin g at 25 to a few milli-arcsecond resolution\, we find that complex mass mod els with angular structure are strongly favoured by the data. In addition\, such observations are sensitive to small-scale structure either in the len s or along the line-of-sight to the background source. From such an analysi s of the data from global VLBI observations\, we detect of a low mass (mill ion solar mass) dark object\, whose properties are inconsistent with a dark matter halo from either cold or warm dark matter models\, but may be in ag reement with more exotic models\, like self-interacting dark matter. Finall y\, we present a brief overview of future studies using the SKA and a likel y African VLBI facility that includes the SKAMPI\, MPG-DZA and AMT dishes. Throughout we will also provide some asides on the pc-scale structure of ra dio jets\, constraints on galactic-scale magnetic fields and electron densi ties\, and the super-resolved (about 10 to 20 pc-scale) properties of starb urst galaxies at redshifts 1 to 4.

      CATEGORIES:Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mpifraifa-m ain-colloquium-speaker-prof-john-mckean/ END:VEVENT BEGIN:VEVENT UID:20260527T1236Z-1779885398.8578-EO-15125-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20260526T121601Z LAST-MODIFIED:20260526T121601Z DTSTART;TZID=Europe/Berlin:20260717T110000 DTEND;TZID=Europe/Berlin:20260717T123000 SUMMARY: MPIfR/AIfA Main Colloquium\, Speaker: Dr. T. Joseph W. Lazio DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium Titel: The Sun Radio Interferometer Space Exp eriment (SunRISE) Speaker: Dr. T. Joseph W. Lazio\, University of Michigan SunRISE is a constellation of six identical small spacecraft (6U CubeSats) that will form a space-based VLBI array. Each spacecraft carries a decametr ic-hectometric (DH\, 0.1 MHz to 25 […] X-ALT-DESC;FMTTYPE=text/html:

      Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium

      Ti tel: The Sun Radio Interferometer Space Experiment (SunRISE)
      Speaker: Dr. T. Joseph W. Lazio\, University of Michigan

      SunRISE is a constell ation of six identical small spacecraft (6U CubeSats) that will form a spac e-based VLBI array. Each spacecraft carries a decametric-hectometric (DH\, 0.1 MHz to 25 MHz) receiving system paired with global navigation satellite system (GNSS) receivers. The Solar DH receivers will be used to record sig nals from Type II and Type III solar radio bursts while the GNSS receivers will time stamp the data and enable the determination of the spacecraft loc ations for subsequent ground-based cross-correlation. SunRISE will reveal a spects of how solar energetic particles (SEPs) are accelerated at coronal m ass ejections (CMEs) by tracking Type II bursts and how SEPs are released i nto interplanetary space from the Type III bursts. The six spacecraft that form the SunRISE interferometer will fly in a passive formation in a supers ynchronous geosynchronous Earth orbit (super-GEO). The nominal baseline wil l be 10 km\, obtaining an angular resolution of approximately 10' at 10 MHz . I describe the implementation of SunRISE\, illustrating how the combinati on of on-board and ground operations and processing are required to achieve a fully space-based VLBI array. While SunRISE is a NASA Mission of Opportu nity that will conduct science in its own right\, it also is intended to be a pathfinder for future space-based radio astronomy missions. I provide an initial assessment of the "experience gained" for future missions\, from t he perspective of both the SunRISE science and technical implementation.

      CATEGORIES:Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mpifraifa-m ain-colloquium-speaker-dr-t-joseph-w-lazio/ END:VEVENT BEGIN:VEVENT UID:20260713T1053Z-1783940037.6606-EO-15149-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20260710T134745Z LAST-MODIFIED:20260710T134745Z DTSTART;TZID=Europe/Berlin:20260717T113000 DTEND;TZID=Europe/Berlin:20260717T130000 SUMMARY: PhD colloquium: Saurabh DESCRIPTION: PhD colloquium\, location: Institute of Physics I\, Cologne Sa urabh Fields\, Flows\, and Fabric of Spacetime: Probing Horizon-Scale Physi cs in Active Galactic Nuclei Abstract: The 230 GHz Event Horizon Telescope (EHT) observations of M87* revealed a polarized ring with a central brightn ess depression\, and 86 GHz Global Millimetre VLBI Array observations resol ved the ring and the extended […] X-ALT-DESC;FMTTYPE=text/html:

      PhD colloquium\, location: Institute of Ph ysics I\, Cologne

      Saurabh

      Fields\, Flows\, and F abric of Spacetime: Probing Horizon-Scale Physics in Active Galactic Nuclei

      Abstract:

      The 230 GHz Event Horizon Telescope (EHT) o bservations of M87* revealed a polarized ring with a central brightness dep ression\, and 86 GHz Global Millimetre VLBI Array observations resolved the ring and the extended jet. The 2021 EHT campaign\, adding NOEMA and the Ki tt Peak 12 m telescope\, supplied the intermediate baselines connecting the se scales. We analyzed the 2021 M87* dataset and using closure phases\, we recovered a Gaussian component offset by about 5500 AU with flux density of about 60 mJy (an upper limit)\, the first 230 GHz detection of the jet bas e\, with most of the previously missing emission arising on larger scales. We employed a semi-analytic radiatively inefficient accretion flow (RIAF) m odel to analyze the 2017 EHT polarimetric data. This showed that disk thick ness has little effect on the observables\, toroidal and poloidal fields ar e distinguishable\, and the polarization favors a partially infalling sub-K eplerian flow. GR also admits horizonless collapse end states under physica lly reasonable matter conditions\, and horizon-scale precision now makes th is assumption testable. We adopt the Joshi-Malafarina-Narayan 1 (JMN-1) spa cetime\, an exact horizonless solution from anisotropic collapse and the be st available black hole mimicker\, to RIAF imaging and to the first three-d imensional GRMHD simulation of sustained accretion onto such an object. JMN -1 produces images nearly indistinguishable from a black hole at current re solution\, predicting a smaller inner shadow as a key discriminant for the upcoming/future VLBI missions such as ngEHT and BHEX.

      CATEGORIES:Thesis Defense ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/phd-colloqu ium-saurabh/ END:VEVENT BEGIN:VEVENT UID:20260717T1314Z-1784294051.0297-EO-15152-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20260717T121101Z LAST-MODIFIED:20260717T121101Z DTSTART;TZID=Europe/Berlin:20260724T110000 DTEND;TZID=Europe/Berlin:20260724T123000 SUMMARY: MPIfR/AIfA Main Colloquium\, Speaker: Dr. Casey Law DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium Titel: Deep Synoptic Array: Project Update an d Science Opportunities Speaker: Dr. Casey Law\, Caltech\, USA X-ALT-DESC;FMTTYPE=text/html:

      Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium

      Ti tel: Deep Synoptic Array: Project Update and Science Opportunities

      Sp eaker: Dr. Casey Law\, Caltech\, USA

      CATEGORIES:Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mpifraifa-m ain-colloquium-speaker-dr-casey-law/ END:VEVENT BEGIN:VEVENT UID:20260703T0940Z-1783071609.9052-EO-15148-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20260703T093807Z LAST-MODIFIED:20260703T093807Z DTSTART;TZID=Europe/Berlin:20260811T100000 DTEND;TZID=Europe/Berlin:20260811T170000 RDATE;TZID=Europe/Berlin:20260812T100000 SUMMARY: Scientific Posters: From Concept to Presentation DESCRIPTION: by Dr Carsten Rohr X-ALT-DESC;FMTTYPE=text/html:

      by Dr Carsten Rohr

      CATEGORIES:Softskills ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/scientific- posters-from-concept-to-presentation/ END:VEVENT BEGIN:VEVENT UID:20260703T0940Z-1783071609.9115-EO-15146-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20260703T093321Z LAST-MODIFIED:20260703T093321Z DTSTART;VALUE=DATE:20260826 DTEND;VALUE=DATE:20260829 SUMMARY: Annual IMPRS A&A Retreat: In 2026 at Harnack House\, Berlin DESCRIPTION: IMPRS A&\;A Retreat\, 2026: Astrophysics at all scales: co mparing theory with observations at Harnck House\, Berlin X-ALT-DESC;FMTTYPE=text/html:

      IMPRS A&A Retreat\, 2026: Astrophysics at all scales: comparing theory with observations

      at Harnck House\, Be rlin

      CATEGORIES:Retreat ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/annual-impr s-aa-retreat-in-2026-at-harnack-house-berlin/ END:VEVENT BEGIN:VEVENT UID:20260703T0940Z-1783071609.916-EO-15147-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20260703T093508Z LAST-MODIFIED:20260703T093508Z DTSTART;TZID=Europe/Berlin:20260910T104500 DTEND;TZID=Europe/Berlin:20260910T180000 SUMMARY: IMPRS A&A Excursion to Effelsberg Observatory DESCRIPTION: Visit of the Effelsberg observatory including observing demons tration and guided tour of the facility. X-ALT-DESC;FMTTYPE=text/html:

      Visit of the Effelsberg observatory includ ing observing demonstration and guided tour of the facility.

      CATEGORIES:Excursion ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/imprs-aa-ex cursion-to-effelsberg-observatory/ END:VEVENT BEGIN:VEVENT UID:20260401T2303Z-1775084632.813-EO-15087-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20260331T113407Z LAST-MODIFIED:20260518T143253Z DTSTART;TZID=Europe/Berlin:20261002T110000 DTEND;TZID=Europe/Berlin:20261002T123000 SUMMARY: MPIfR/AIfA Main Colloquium\, Speaker: Prof. Dr. Felix Aharonian DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium Titel: Cosmic-Ray PeVatrons: Extreme Particle Accelerators in the Milky Way Speaker: Prof. Dr. Felix Aharonian\, DIAS/Du blin and MPIK/Heidelberg PeVatrons – cosmic-ray factories capable of accele rating particles to petaelectronvolt (PeV) energies – are widely believed t o play a key role in resolving the century-old mystery of […] X-ALT-DESC;FMTTYPE=text/html:

      Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium

      Ti tel: Cosmic-Ray PeVatrons: Extreme Particle Accelerators in the Milky Way

      Speaker: Prof. Dr. Felix Aharonian\, DIAS/Dublin and MPIK/Heidelberg

      PeVatrons - cosmic-ray factories capable of accelerating particles to petaelectronvolt (PeV) energies - are widely believed to play a key role in resolving the century-old mystery of the origin of Galactic cosmic rays. F or decades\, the nature of these objects has been the subject of extensive theoretical and observational studies\, with supernova remnants long regard ed as the prime candidates. In recent years\, major observational advances\ , primarily the detection of gamma rays with energies exceeding 100 TeV fro m dozens of Galactic sources\, have led to a breakthrough with far-reaching implications. Taken together\, these developments suggest that the Milky W ay hosts a diverse population of extreme particle accelerators capable of p roducing cosmic rays at PeV energies. At the same time\, increasingly preci se measurements of cosmic-ray spectra and composition have significantly im proved our understanding of Galactic cosmic rays from GeV to PeV energies. These observations reveal that a diversity of cosmic-ray accelerators assoc iated with several Galactic source populations\, including supernova remnan ts\, star-forming regions\, pulsar wind nebulae\, and microquasars\, may cr eate\, despite their fundamentally different physical environments\, near-i deal conditions for particle acceleration operating close to the theoretica l limits. This review summarizes the theoretical predictions\, observationa l discoveries\, and current interpretations of PeVatrons\, discusses their implications for high-energy astrophysics\, particularly for the origin of Galactic cosmic rays\, and outlines future directions for multiwavelength o bservations.

      CATEGORIES:Main Colloquium ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/mpifraifa-m ain-colloquium-speaker-prof-dr-felix-aharonian/ END:VEVENT BEGIN:VEVENT UID:20260723T0345Z-1784778336.1035-EO-15155-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20260721T160628Z LAST-MODIFIED:20260721T160857Z DTSTART;TZID=Europe/Berlin:20261012T090000 DTEND;TZID=Europe/Berlin:20261012T130000 RRULE:FREQ=DAILY;INTERVAL=1;UNTIL=20261014T070000Z SUMMARY: Advancing Science with AI DESCRIPTION: by Markus Gyger Online event. X-ALT-DESC;FMTTYPE=text/html:

      by Markus Gyger

      Online event.

      CATEGORIES:Softskills ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/advancing-s cience-with-ai/ END:VEVENT BEGIN:VEVENT UID:20260713T1053Z-1783940037.6759-EO-15150-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20260710T172623Z LAST-MODIFIED:20260710T172623Z DTSTART;TZID=Europe/Berlin:20261021T100000 DTEND;TZID=Europe/Berlin:20261021T170000 SUMMARY: IMPRS A&A Excursion to Forschungszentrum Jülich DESCRIPTION: Visit of the Forschungszentrum Jülich including a guided tour of selected facilities. X-ALT-DESC;FMTTYPE=text/html:

      Visit of the Forschungszentrum Jülich incl uding a guided tour of selected facilities.

      CATEGORIES:Excursion ORGANIZER;CN="ahoyer":MAILTO:ahoyer@mpifr-bonn.mpg.de URL;VALUE=URI:https://blog.mpifr-bonn.mpg.de/imprs/events/event/imprs-aa-ex cursion-to-forschungszentrum-julich/ END:VEVENT BEGIN:VEVENT UID:20260809T0302Z-1786244535.6886-EO-15158-25@134.104.18.128 STATUS:CONFIRMED DTSTAMP:20260816T175105Z CREATED:20260806T173724Z LAST-MODIFIED:20260806T173724Z DTSTART;TZID=Europe/Berlin:20261113T110000 DTEND;TZID=Europe/Berlin:20261113T123000 SUMMARY: MPIfR/AIfA Main Colloquium\, Speaker: Prof. Dr. Tim Dietrich DESCRIPTION: Max Planck Institute for Radio Astronomy/Argelander Institute for Astronomy Main Colloquium Titel: Decoding Neutron Star Mergers: From Nu merical Relativity to Multi-Messenger Inference Speaker: Prof. Dr. Tim Diet rich\, Max-Planck-Institut für Gravitationsphysik\, Potsdam/Golm Neutron st ars are among the densest known objects\, and the merger of two neutron sta rs is one of the most energetic phenomena known. Interpreting these […] X-ALT-DESC;FMTTYPE=text/html:

      Max Planck Institute for Radio Ast ronomy/Argelander Institute for Astronomy Main Colloquium

      Ti tel: Decoding Neutron Star Mergers: From Numerical Relativity to Multi-Mess enger Inference

      Speaker: Prof. Dr. Tim Dietrich\, Max-Planck-Institut für Gravitationsphysik\, Potsdam/Golm

      Neutron stars are among the de nsest known objects\, and the merger of two neutron stars is one of the mos t energetic phenomena known. Interpreting these mergers through their multi -messenger emission requires accurate theoretical models that can be correl ated with the observational data. Gravitational-wave models combine ab init io numerical-relativity simulations with analytical waveform approximations \, enabling predictions that are both accurate and computationally efficien t. Similar modelling strategies can be applied to electromagnetic counterpa rts\, including the kilonova and the gamma-ray burst afterglow. Integrating these components into a unified multi-messenger framework enables the extr action of fundamental physics from observations\, leading to tighter constr aints on the equation of state of neutron stars\, more precise measurements of the Hubble constant\, and a better understanding of heavy-element produ ction in the Universe. This colloquium is initiated by the IMPRS students o f the MPIfR.

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