Total-to-selective extinction and the formation of molecules in diffuse interstellar clouds

Details Total-to-selective extinction and the formation of molecules in diffuse interstellar clouds Total-to-selective extinction and the formation of molecules in diffuse interstellar clouds

Dec 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...335..177c&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 335, Dec. 1, 1988, p. 177-184.

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39

Computational Astrophysics, Interstellar Chemistry, Interstellar Extinction, Interstellar Matter, Molecular Clouds, Carbon Compounds, Carbon Monoxide, Formyl Ions, Hydrocarbons, Hydrogen, Photodissociation

Scientific paper

The author examines the dependency of the abundances of CH and H2 on the ratio of total-to-selective extinction, R, for a sample of diffuse clouds with Av < 2 mag. It is found that >N(CH)< and >N(H2)< decrease by about factors of 4 and 3, respectively, in going from >R< ≈ 2.9 to 3.9. For H2, this decrease appears to be consistent with a combination of both the loss of available grain surface area through coagulation and a increase in the UV radiation field through a decrease in AUV. Data for lines of sight with Av > 2 mag indicate that the general decrease of N(CH), and probably N(H2), with R persists for regions where gas-phase chemistry should dominate. Because it can be used to estimate UV extinction, R may be a suitable parameter for chemical modeling of diffuse cloud environments.

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