The abundance of atomic carbon near the ionization fronts in M17 and S140

Details The abundance of atomic carbon near the ionization fronts in M17 and S140 The abundance of atomic carbon near the ionization fronts in M17 and S140

Dec 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...299..967k&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 299, Dec. 15, 1985, p. 967-980.

Other

141

Carbon, Gas Ionization, Interstellar Chemistry, Interstellar Matter, Molecular Clouds, Carbon Monoxide, Optical Thickness, Photodissociation, Photoproduction, Time Dependence

Scientific paper

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.

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