Hydrogen densities in molecular clouds inferred from CO observations

Details Hydrogen densities in molecular clouds inferred from CO observations Hydrogen densities in molecular clouds inferred from CO observations

Jan 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...227l..43p&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 227, Jan. 1, 1979, p. L43-L47.

Other

38

Carbon Monoxide, Hydrogen Clouds, Interstellar Gas, Molecular Spectra, Abundance, Gas Density, Microwave Emission

Scientific paper

Observations of the J = 2-1 and J = 1-0 rotational transitions of (C-12)O, (C-13)O, and C(O-18) are reported for 10 molecular clouds. An analysis of the data based on a large-velocity-gradient cloud model suggests that in most of these sources the average molecular hydrogen densities lie between 2000 and 8000 per cu cm, while (C-13)O fractional abundances are approximately 3 millionths. These hydrogen densities are typically a factor of 10 lower than those inferred from observations of other molecules, such as HCN, CS, or H2CO; possible explanations for this discrepancy are discussed.

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