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H2CS abundances and ortho-to-para ratios in interstellar cloudsSeveral H2CS ortho and para transitions have been observed toward interstellar molecular clouds, including cold, dark clouds and star-forming regions. H2CS fractional abundances f(H2CS) about 1-2 10 to the -9th relative to molecular hydrogen toward TMC-1, Orion A, and NGC 7538, and about 5 10 to the -10th for L134N are derived. The H2CS ortho-to-para ratios in TMC-1 are about 1.8 toward the cyanopolyyne peak and the ammonia peak, which may indicate the thermalization of H2CS on 10 K grains. A ratio of about 3, the statistical value, for Orion (3N, 1E) and NGC 7538 is derived, while a value of about 2 for Orion (KL) is found.
Document ID
19910052730
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Minh, Y. C.
(Five-College Astronomy Dept. Amherst, MA, United States)
Irvine, W. M.
(Five-College Astronomy Dept. Amherst, MA, United States)
Brewer, M. K.
(Five College Radio Astronomy Observatory Amherst, MA, United States)
Date Acquired
August 15, 2013
Publication Date
April 1, 1991
Publication Information
Publication: Astronomy and Astrophysics
Volume: 244
Issue: 1 Ap
ISSN: 0004-6361
Subject Category
Astrophysics
Accession Number
91A37353
Funding Number(s)
CONTRACT_GRANT: NAGW-436
CONTRACT_GRANT: NSF AST-88-15406
Distribution Limits
Public
Copyright
Other

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