The C/CO ratio in dense interstellar clouds

Details The C/CO ratio in dense interstellar clouds The C/CO ratio in dense interstellar clouds

Dec 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...323l.137g&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 323, Dec. 15, 1987, p. L137-L139.

Statistics

Computation

71

Abundance, Carbon, Carbon Monoxide, Cosmic Rays, Interstellar Matter, Molecular Clouds, Computational Chemistry, Gas Ionization, Rydberg Series, Steady State

Scientific paper

The cosmic-ray-induced photodestruction (CRIP) of CO in dense interstellar clouds is investigated by means of numerical simulations to determine the C/CO abundance ratio. The model takes the dependence of C/CO on the rotational temperature, abundance, and velocity distribution of the CO into account. The results are presented in a table and briefly characterized. A uniform 30-K cloud with CO/H2 = 0.00015 is found to have steady-state C/CO = 0.005 when CRIP is included, about 1000 times the ratio without CRIP. The unusually high C/CO of 0.1 seen in some clouds (Keene et al., 1985) is explained in terms of a C depletion factor of 0.001 relative to O and a velocity difference through the cloud of about 10 km/s.

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