MICROWAVE OBSERVATIONS OF $CH_{4}, CH_{3}D$, AND $HC_{5}N$ IN THE INTERSTELLAR MEDIUM
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Date
1979
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Ohio State University
Abstract
We recently $reported^{1}$ the detection of six distinct pure-rotational vibronic ground-state $\Delta$ J=0 transitions in $^{12}CH_{4}$ in emission from the Orion molecular cloud. Since then, additional observations have yielded the following new results. The J=15, A1(1)-A2(1) transition in $^{12}CH_{4}$ at 21.303 GHz has been detected in emission from Orion A. During these same observations, the nearby J=8-7 transition in $HC_{5} N$ at 21.301 GHz was detected in emission from IRC + 10216. A while earlier, we also tentatively detected an emission line form Orion A at the frequency of a J=22 transition of $CH_{3}D$; we infer $[CH_{4}]/[CH_{3}D]\approx 20$. We will discuss the systematics of our methane observations, and present new estimates of the column density of $^{12}CH_{4}$ in Orion A.
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$^{1}$K. Fox and D. E. Jennings, Paper WH12, 33rd Symposium on Molecular Spectroscopy, The Ohio State University (1978); Astrophys. J. 226, L43 (1978).
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