Shielding of CO from dissociating radiation in interstellar clouds

Details Shielding of CO from dissociating radiation in interstellar clouds Shielding of CO from dissociating radiation in interstellar clouds

Mar 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...290..615g&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 290, March 15, 1985, p. 615-626.

Astronomy and Astrophysics

Astrophysics

92

Carbon Monoxide, Interstellar Chemistry, Interstellar Matter, Molecular Clouds, Photodissociation, Radiation Shielding, Astronomical Models, Isotopic Enrichment, Radiative Transfer, Reaction Kinetics, Ultraviolet Radiation

Scientific paper

The paper investigates the photodissociation of CO in interstellar clouds in the light of recent laboratory studies which suggest that line rather than continuum processes dominate its dissociation by ultraviolet radiation. Using a simple radiative transfer model, the shielding of representative dissociating bands is estimated, including self-shielding, mutual shielding between different isotopes, and near coincidences with strong lines of H2. Each of these processes materially affects the photodestruction rates of the various isotopic species in the transition regions of molecular clouds. These results are combined with an appropriate gas phase chemical model to determine how the abundances of the CO isotopes vary with depth into the cloud. It is found that self-shielding and mutual shielding cause significant variations in isotopic ratios. In addition, fractionation enhances species containing C-13. The relationship between the column densities of CO and H2 is found to vary for the different isotopes and to be sensitive to local conditions.

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