MS Hannah Zohren

/MS Hannah Zohren

MS Hannah Zohren

Event Details

Speaker: Hannah Zohren

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

Samples of galaxy clusters provide a versatile basis for studies of the cosmological parameters that 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 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 independent cluster samples. On the one hand, I will show our follow-up analysis of optical observations obtained for 32 Planck cluster candidates using 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 SZ-significance in the 2500 deg^2 SPT-SZ Survey.