Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982azh....59..676z&link_type=abstract
(Astronomicheskii Zhurnal, vol. 59, July-Aug. 1982, p.676-682) Soviet Astronomy (ISSN 0038-5301), vol. 26, July-Aug. 1982, p. 41
Astronomy and Astrophysics
Astronomy
3
Energy Levels, Hydrocyanic Acid, Interstellar Matter, Molecular Clouds, Molecular Excitation, Molecular Rotation, Deuterium Compounds, Gas Density, Gas Temperature, Hyperfine Structure, Line Spectra, Spectral Energy Distribution
Scientific paper
Calculations are made of the dependence of the rotational-level population and the excitation temperature for each transition on the number density and the kinetic temperature of the gas. Consideration is given to the way in which the rotational-level populations of the HCN molecule and its isotopic variants should depend on the number density in the range 10 to the 3rd-10 to the 9th/cu cm and on the kinetic temperature in the range 10-100 K. It is assumed that the medium is optically thin in all the HCN rotational lines. It is shown that the HCN molecule and its isotope-substituted variants can serve as effective probes for determining the kinetic temperature and number density of interstellar gas, especially in high-density region where the lower rotational levels of the CO molecule have begun to thermalize so that their populations no longer depend on the number density.
Khersonskii V. K.
Zinchenko I. I.
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