The CN radical in diffuse interstellar clouds

Details The CN radical in diffuse interstellar clouds The CN radical in diffuse interstellar clouds

Dec 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...287..219f&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 287, Dec. 1, 1984, p. 219-227. Research supported by the Robert A. Welch Fo

Astronomy and Astrophysics

Astrophysics

82

Absorption Spectra, Cyanogen, Diffuse Radiation, Interstellar Gas, Molecular Clouds, Photodissociation, Oscillator Strengths

Scientific paper

A survey of 15 lines of sight for the CN B2Sigma(+) X2Sigma(+) interstellar absorption lines shows that the CN column density in diffuse interstellar clouds follows the relation log N(CN) is proportional to m log N(H2), where m is approximately equal to 3. This result is reproduced by a reaction network in which CN is produced primarily from C2 by the neutral-neutral reaction C2 + N yields CN + C, and photodissociation is the main destruction pathway for the neutral molecules CH, C2, and CN. The CN radical is the first molecular species observed in diffuse clouds that requires a neutral-neutral reaction for its formation in the gas phase. The network also reproduces the observed ratio N(CN)/N(H2).

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