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The abundance of atomic carbon near the ionization fronts in M17 and S140
External Online Source: doi:10.1086/163763
Author and Affiliation:
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)
Abstract: The 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.
Publication Date: Dec 15, 1985
Document ID:
19860049351
(Acquired Nov 28, 1995)
Accession Number: 86A34089
Subject Category: ASTROPHYSICS
Document Type: Journal Article
Publication Information: Astrophysical Journal, Part 1 (ISSN 0004-637X); 299; 967-980
Publisher Information: United States
Contract/Grant/Task Num: NAG2-1
Financial Sponsor: NASA; United States
Organization Source: California Inst. of Tech.; Pasadena, CA, United States
New York Univ.; New York, NY, United States
Jet Propulsion Lab., California Inst. of Tech.; Pasadena, CA, United States
Description: 14p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: CARBON; GAS IONIZATION; INTERSTELLAR CHEMISTRY; INTERSTELLAR MATTER; MOLECULAR CLOUDS; CARBON MONOXIDE; OPTICAL THICKNESS; PHOTODISSOCIATION; PHOTOPRODUCTION; TIME DEPENDENCE
Imprint And Other Notes: Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 299, Dec. 15, 1985, p. 967-980.
Availability Source: Other Sources
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