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Measurement of the methyl cyanide E/A ratio in TMC-1We have observed the methyl cyanide (CH3CN) J = 2-1 K = 0 and 1 transitions toward the cyanopolyyne peak of TMC-1 and have derived an E/A (ortho/para)abundance ratio N(E)/N(A) = 0.75 +/- 0.10. The total methyl cyanide column density is N(total) = 5 x 10 exp 12/sq cm toward TMC-1, in agreement with earlier results from the J = 1-0 lines.
Document ID
19940035009
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Minh, Y. C. (Korea Astronomy Observatory, Taejon, Republic of Korea; Five College Radio Astronomy Observatory, Amherst MA, United States)
Irvine, W. M. (Five College Radio Astronomy Observatory Amherst, MA, United States)
Ohishi, M. (NASA Headquarters Washington, DC United States)
Ishikawa, S. (Nobeyama Radio Observatory Minamimaki, Japan)
Saito, S. (Nagoya Univ. Japan)
Kaifu, N. (National Astronomical Observatory Mitaka, Japan)
Date Acquired
August 16, 2013
Publication Date
January 1, 1993
Publication Information
Publication: Astronomy and Astrophysics
Volume: 267
Issue: 1
ISSN: 0004-6361
Subject Category
Astrophysics
Accession Number
94A11664
Funding Number(s)
CONTRACT_GRANT: NAGW-436
Distribution Limits
Public
Copyright
Other

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