Abundance of atomic carbon /C I/ in dense interstellar clouds

Details Abundance of atomic carbon /C I/ in dense interstellar clouds Abundance of atomic carbon /C I/ in dense interstellar clouds

Dec 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...251..533p&link_type=abstract

Astrophysical Journal, Part 1, vol. 251, Dec. 15, 1981, p. 533-540.

Astronomy and Astrophysics

Astrophysics

170

Abundance, Carbon, Gas Density, Interstellar Gas, Line Spectra, Molecular Clouds, Astronomical Models, Carbon Compounds, Fine Structure, Infrared Spectra, Interstellar Chemistry, Molecular Spectra, Optical Thickness

Scientific paper

The abundance of interstellar neutral atomic carbon is investigated by means of its ground state fine-structure line emission at 492 GHz using the 91.5 cm telescope of NASAs Kuiper Airborne Observatory. Atomic carbon is found to be very abundant in dense interstellar molecular clouds with column densities of about 10 to the 19th per sq cm. Because the observations have considerably greater column densities than current theories of carbon chemistry, it is suggested that the physical conditions of these clouds are not as simple as assumed in the models. Various situations are discussed which would lead to large C I abundances, including the possibility that the chemical lifetimes of the clouds are relatively short.

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