Thermal overlap effects and collision models - HCN

Details Thermal overlap effects and collision models - HCN Thermal overlap effects and collision models - HCN

Apr 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a....97..213g&link_type=abstract

Astronomy and Astrophysics, vol. 97, no. 1, Apr. 1981, p. 213-217.

Astronomy and Astrophysics

Astrophysics

47

Astronomical Spectroscopy, Hydrocyanic Acid, Line Spectra, Millimeter Waves, Molecular Clouds, Molecular Collisions, Astronomical Models, Hydrogen Clouds, Hydrogen Ions, Hyperfine Structure, Interstellar Matter, Molecular Excitation, Transition Probabilities

Scientific paper

The influence of thermal overlap effects on the intensity ratios of the hyperfine split components of HCN at 3.39 mm is reinvestigated for a turbulent cloud model using a generalization of the photon escape probability formalism. The calculations show the crucial importance of Doppler width overlaps of hyperfine components to explain the line intensity anomalies observed in the interstellar medium. The influence of inelastic and quasi-elastic collisions is also discussed. The observed line intensities are best fitted for high total densities (approximately 100,000/cu cm) and moderately low opacities (approximately 1 to 3).

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