Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985qjras..26..463w&link_type=abstract
Royal Astronomical Society, Quarterly Journal (ISSN 0035-8738), vol. 26, Dec. 1985, p. 463-477.
Astronomy and Astrophysics
Astronomy
24
Abundance, Hydrogen Clouds, Interstellar Matter, Milky Way Galaxy, Molecular Clouds, Carbon Monoxide, Dynamic Models, Gamma Ray Spectra, Interstellar Chemistry, Radio Spectra, Stellar Evolution
Scientific paper
Direct and indirect methods of determining the abundance of interstellar molecular hydrogen are reviewed. The discrepancy between the results from radio techniques and from gamma-ray techniques is described. Radio methods of determining H2 dark cloud masses often adopt a 'canonical' value of the CO:H2 ratio of these molecules in the gas phase. The results of current models of interstellar chemistry are described, and are shown to provide no support for the use of a canonical CO:H2 ratio in dark clouds. On the contrary, it is argued that the ratio may vary from point to point in a cloud, reflecting the general level of star-forming activity in any region. The value of the ratio in dark clouds may range from near zero in quiescent regions, up to a value which assumes that as much CO as possible is formed from available C and O atoms.
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