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Observations of neutral atomic carbon at 809 GHzThe 3P2-3P1 line at 809 GHz has been observed in four dense molecular clouds: M17, W51, W3, and DR 21(OH). The results indicate excitation temperatures of 30-60 K and optical depths of one or less. This implies that the roughly 10 to the 18th/sq cm lower limit to the C I abundance derived from 492-GHz observations is probably the actual abundance, which gives C I/CO of about 0.1 in dense molecular clouds.
Document ID
19870027451
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Zmuidzinas, J.
(California Univ. Berkeley, CA, United States)
Betz, A. L.
(California Univ. Berkeley, CA, United States)
Goldhaber, D. M.
(California, University Berkeley, United States)
Date Acquired
August 13, 2013
Publication Date
August 15, 1986
Publication Information
Publication: Astrophysical Journal, Part 2 - Letters to the Editor
Volume: 307
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
87A14725
Funding Number(s)
CONTRACT_GRANT: NAG2-254
Distribution Limits
Public
Copyright
Other

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