Title: Orion through the 1 mm window – A complete imaging line survey of OMC-1 to OMC-3 from 200 to 280 GHz
The northern part of the Orion A molecular cloud is one of the most prominent regions of low to high-mass
star formation. Its close proximity of just 414 ± 7 pc enables us to spatially resolve
its physically and chemically different regions. Our unbiased dataset obtained with the APEX telescope and
the PI230 receiver covers the area of OMC-1 to OMC-3 from 200.2 to 281.8 GHz, enabling us to
examine the characteristics of star formation in a variety of environments within a contiguous molecular
cloud and the chemical diversity of an intensely heated region.
OMC-1 contains high-mass star forming sites and is heavily influenced by intense UV radiation from the
young massive ‘Trapezium’ stars. It also includes the prototypical photon-dominated region (PDR) Orion Bar,
outflows, a hot core containing a rich chemistry of complex molecules, but also more quiescent gas. In
contrast, there are no massive O/B stars in OMC-2/3, but a large number of pre-stellar Class 0 and Class I
objects, resulting in a very different environment with outflows driven by young embedded stars, but
without extreme UV radiation.