The ratio of carbon monoxide to molecular hydrogen in interstellar dark clouds

Details The ratio of carbon monoxide to molecular hydrogen in interstellar dark clouds The ratio of carbon monoxide to molecular hydrogen in interstellar dark clouds

Aug 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apjs...37..407d&link_type=abstract

Astrophysical Journal Supplement Series, vol. 37, Aug. 1978, p. 407-427. Research supported by the Aerospace Corp.

Astronomy and Astrophysics

Astrophysics

668

Abundance, Carbon Monoxide, Gas Density, Hydrogen, Interstellar Gas, Astronomical Models, Chemical Fractionation, Data Correlation, Interstellar Chemistry, Tables (Data), Thermodynamic Equilibrium

Scientific paper

LTE (C-13)O column densities are compared with the corresponding values of beam-convolved visual extinction at more than 100 locations within 38 different interstellar dark clouds. A roughly linear correlation is found to exist between these two quantities for visual extinctions in the range from about 1.5 to 5 mag. It is argued that this correlation can be extended up to about 10 mag and that the standard gas-to-extinction ratio can be expected to remain valid in the sources studied. The correlation of LTE (C-13)O column density with visual extinction is used to obtain an equation for the H2 column density associated with a given (C-13)O column density. It is shown that if the clouds studied are assumed to be chemically homogeneous, the equation obtained implies that at least 12% of all gas-phase carbon is in the form of CO. Comparison of the observational data with various theories proposed for molecule formation in dark clouds indicates that Langer's (1977) ion-molecule scheme accounts well for the observations when the fractionation channel of Watson et al. (1976) is included.

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