Herschel-SPIRE Imaging Spectroscopy of Molecular Gas in M82

Details Herschel-SPIRE Imaging Spectroscopy of Molecular Gas in M82 Herschel-SPIRE Imaging Spectroscopy of Molecular Gas in M82

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21942712k&link_type=abstract

American Astronomical Society, AAS Meeting #219, #427.12

Astronomy and Astrophysics

Astronomy

Scientific paper

We present new Herschel-SPIRE imaging spectroscopy (194-671 micron) of the bright starburst galaxy M82. Covering the CO ladder from J=4-3 to J=13-12, these spectra were obtained at multiple positions for a fully sampled 3 x 3 arcminute map, as well as a longer exposure at the central position. We use RADEX and a Bayesian Likelihood Analysis to model the temperature, density, column density, and filling factor of the molecular gas traced by the high-J CO transitions unavailable from the ground. We add further evidence to these lines tracing a much warmer component (> 500 K) than low-J lines. At this temperature, cooling is dominated by molecular hydrogen; we discuss the possible excitation processes in this warm component and compare to models of PDRs. SPIRE has been developed by a consortium of more than 18 institutes from eight countries led by Cardiff University (UK).

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