The Kinetic Temperature of Molecular Gas in Arp 220: Ammonia Observations with the ATCA and GBT

Details The Kinetic Temperature of Molecular Gas in Arp 220: Ammonia Observations with the ATCA and GBT The Kinetic Temperature of Molecular Gas in Arp 220: Ammonia Observations with the ATCA and GBT

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21724509o&link_type=abstract

American Astronomical Society, AAS Meeting #217, #245.09; Bulletin of the American Astronomical Society, Vol. 43, 2011

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Using the ATCA and GBT telescopes, we observed ammonia (NH3) in Arp 220, the nearest ultraluminous infrared galaxy merger. We detect all the inversion transitions from (1,1) through (6,6) in absorption against the bright radio continuum. The velocities indicate that the absorption emerges from the gas that encompasses both starburst nuclei. Ammonia is a very good thermometer for the molecular gas and we derive a kinetic temperature of 186+/-55 K. The profile of the ammonia (1,1) emission is unusually weak compared to the other inversion transitions, which may indicate an additional cold component that is masking the line profile.

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