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The abundance of atomic carbon near the ionization fronts in M17 and S140The 492 GHz ground-state line of atomic carbon in the edge-on ionization fronts in M17 and S140 were observed. It was found that, contrary to expectation, the C I emission peaks farther into the molecular cloud from the ionization front than does the CO. In fact the peak C I abundance in M17 occurs more than 60 mag of visual extinction into the cloud from the ionization front. Calculations of the ratio of C I to CO column densities yield values of 0.1-0.2. These observations do not support chemical models which predict that neutral atomic carbon should be found only near the edges of molelcular clouds. Other models are discussed which may explain the observations.
Document ID
19860049351
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Keene, J.
(California Inst. of Tech. Pasadena, CA, United States)
Blake, G. A.
(California Inst. of Tech. Pasadena, CA, United States)
Phillips, T. G.
(California Institute of Technology Pasadena, United States)
Huggins, P. J.
(New York University NY, United States)
Beichman, C. A.
(California Institute of Technology Jet Propulsion Laboratory, Pasadena, United States)
Date Acquired
August 12, 2013
Publication Date
December 15, 1985
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 299
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
86A34089
Funding Number(s)
CONTRACT_GRANT: NAG2-1
Distribution Limits
Public
Copyright
Other

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