Excitation of interstellar CH

Details Excitation of interstellar CH Excitation of interstellar CH

Jan 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...130..380b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 130, no. 2, Jan. 1984, p. 380-388.

Astronomy and Astrophysics

Astronomy

12

Astronomical Models, Interstellar Masers, Molecular Clouds, Molecular Excitation, Emission Spectra, Gravitational Collapse, Ground State, H Ii Regions, Hydrogen Atoms, Inelastic Collisions, Methyl Compounds, Particle Collisions, Population Inversion, Radio Sources (Astronomy)

Scientific paper

This work presents detailed calculations concerning the interstellar 9-cm emission lines of CH, with particular regard to the anomalous relative intensities of the three ground-state lines. In the authors' model, collisions of atomic hydrogen are responsible for the overall inversion of the ground-state Λ-doublet of CH. The non-statistical distribution of population within the hyperfine levels arises through the interaction of CH with a far-infrared dust induced radiation field through the overlap of lines around 150 μ. The physical conditions are derived for the molecular cloud in front of the radio source 3C 123, where the main line dominates, and for the cloud associated with the H II region W51 in which the lower satellite is the strongest line.

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