Astronomy and Astrophysics – Astronomy
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011iaus..280p..93b&link_type=abstract
The Molecular Universe, Posters from the proceedings of the 280th Symposium of the International Astronomical Union held in Tole
Astronomy and Astrophysics
Astronomy
Scientific paper
The Herschel GT key program ``Herschel observations of EXtra-Ordinary Sources (HEXOS): the Orion and Sagittarius B2 star-forming regions'' has explored the spectral emissions of template objects (Orion KL, Orion Bar, Sgr B2 N + M) with Herschel HIFI and PACS from ˜158--610 μm. I will report on some of the exciting results. This includes the detection of HD18O in Orion which hints at very high levels of deuterium fractionation in ices along with clear variations in different spectral components. Second, we detect metastable states of H_3O+ from (1,1) to (11,11) in the envelope of the Sgr B2 molecular cloud with the highest-J lines exhibiting excitation temperatures of a several thousand K. We propose that this represents the detection of H_3O^+ formation pumping due to X-ray ionization from a source that is coincident with Sgr B2. This ionization source has been previously argued to be reflected and reprocessed X-rays from the Sgr A^* black hole. We suggest that energetic H_3O^+ is a tracer of highly ionized molecular regions located near the central engines of active galaxies. Finally, the complete spectrum of each of these regions has yielded an unparalleled comparative view of emission from shocks, pdrs, and hot cores which will be presented. Each of these results have exciting and interesting implications for the astrochemical community and will be be placed in context for future studies with Herschel and looking forward to ALMA.
Bergin Edwin A.
Herschel Hexos Team
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