Other
Scientific paper
Dec 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...183.1605w&link_type=abstract
American Astronomical Society, 183rd AAS Meeting, #16.05; Bulletin of the American Astronomical Society, Vol. 25, p.1315
Other
Scientific paper
We present 4''--6'' images of the methyl cyanide (CH_3CN) J=5_K--4_K lines toward the Orion-KL region obtained with the Hat Creek millimeter interferometer. The morphology of the low excitation lines closely follows the distribution of dust emission, while the higher excitation lines are confined to a 10'' region near IRc2. Methyl cyanide emission is found associated with all of the previously recognized source substructures, including the hot core, CS1 condensation (``10 km s(-1) feature''), compact ridge (``8 km s(-1) feature''), western clump, extended ridge, and northwest filament. Methyl Cyanide, like other symmetric top molecules, makes an excellent thermometer. Statistical equilibrium calculations constrain the temperature of the CS1 condensation to the range 50--80 K and the temperature of the southern ridge to the range 120--170 K. Dynamical interactions with the IRc2 outflow likely contribute to heating these regions. Much higher temperatures, >250 K, are indicated for the hot core, where the CH_3CN abundance is enhanced by at least two orders of magnitude, presumably due to grain chemistry.
Plambeck Richard L.
Wilner David J.
Wright Mel C. H.
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