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The abundances of atomic carbon and carbon monoxide compared with visual extinction in the Ophiuchus molecular cloud complexEmission from the 492 GHz lines of C I have been observed toward six positions in the Ophiuchus molecular cloud complex for which accurate visual extinctions are available. The column density of C I increases with A(V) to greater than 2 x 10 to the 17th/sq cm at 100 mag, the column-averaged fractional abundance reaches a peak of about 2.2 x 10 to the -5th for A(V) in the range 4-11 mag and the column-averaged abundance ratio of C I to CO decreases with A(V) from about 1 at 2 mag to greater that about 0.03 at 100 mag. These results imply that, while C I is not the primary reservoir of gaseous carbon even at cloud edges, its fractional abundance remains high for at least 10 mag into the cloud and may be significant at even greater depths.
Document ID
19890064610
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Frerking, Margaret A.
(California Institute of Technology Jet Propulsion Laboratory, Pasadena, United States)
Keene, Jocelyn
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Blake, Geoffrey A.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Phillips, T. G.
(California Institute of Technology Pasadena, United States)
Date Acquired
August 14, 2013
Publication Date
September 1, 1989
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 344
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
89A51981
Funding Number(s)
CONTRACT_GRANT: NAG2-1
Distribution Limits
Public
Copyright
Other

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