Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21942711s&link_type=abstract
American Astronomical Society, AAS Meeting #219, #427.11
Astronomy and Astrophysics
Astronomy
Scientific paper
We present spectroscopically resolved GBT observations of the NH3 (J,K) = (1,1),(2,1), (2,2), (3,3), (4,4), (5,5), (6,6), and (7,7) inversion transitions and the H2CO J_K-1,K+1= 110-111 and 211-212 transitions toward the starburst and polar ring galaxy NGC660. Four components were observed in the spectra. One component is placed in the ring and two in the disk by comparing the NH3 fits with spatially resolved OH and HI absorption maps. The placement of the remaining component was indeterminate. We derive an average kinetic temperature of TK = 150 ± 15 K toward the nuclear region from LVG radiative transfer models of the NH3 measurements and place limits on the galactic disk spatial density between n(H2) = 105.03 - 105.34 cm-3.The high kinetic temperature in the polar ring and relative abundance N(NH3)/N(H2CO) ≈ 103 - 104 is found to be consistent with recent models of ISM heating by photon dominated regions and mechanical heating, with a negligible contribution from cosmic ray heating.
Mangum Jeffrey G.
Svoboda Brian E.
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