Molecular abundances in the high-latitude molecular clouds

Details Molecular abundances in the high-latitude molecular clouds Molecular abundances in the high-latitude molecular clouds

Mar 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...326..909m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 326, March 15, 1988, p. 909-923.

Astronomy and Astrophysics

Astrophysics

66

Absorption Spectra, Abundance, Carbon Monoxide, Hydroxyl Emission, Line Spectra, Molecular Clouds, Dark Matter, Interstellar Matter, Ultraviolet Spectra, Vapor Phases

Scientific paper

The abundances of CO, OH, and H2CO are determined for a sample of high-latitude molecular clouds. In spite of the low average extinction of these objects (Av ≡ 0.6 mag), which is similar to the extinction in the diffuse molecular clouds identified via UV absorption lines, the high-latitude clouds show abundances similar to those of the dark molecular clouds, where the gas phase chemistry is substantiallay different. The N(H2)/WCO ratio is determined from the CO and extinction data and produces individual cloud values ranging from 1×1020 to 6×1020 molecules cm-2K-1(km s-1)-1. Possible explanations for the enhanced molecular abundances in the high-latitude clouds with respect to the diffuse molecular clouds are outlined.

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