Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987azh....64..483z&link_type=abstract
Astronomicheskii Zhurnal (ISSN 0004-6299), vol. 64, May-June 1987, p. 483-494. In Russian.
Astronomy and Astrophysics
Astronomy
4
Emission Spectra, Expansion, Gravitational Collapse, Hydrocyanic Acid, Molecular Clouds, Molecular Excitation, Astronomical Models, Hyperfine Structure, Interstellar Matter, Optical Thickness
Scientific paper
Excitation of molecules with hyperfine structure in collapsing and expanding clouds is analysed. Close and distant overlaps of the transition components are taken into account. Excitation temperatures, optical depths and component intensities of the HCN J = 1-0 transition are evaluated in the large velocity gradient approximation for spherically symmetric clouds, which are collapsing or expanding with the velocity law v(r) ∝ r. The relative intensities of the components are different in the case of collapse and in the case of expansion. The relative intensity anomalies are discussed for cloud models with different kinetic temperature (10K, 30K and 60K) and different radial velocities. The dependence on density is briefly considered. The calculation results are compared with the observations of {hot} molecular clouds associated with H II regions and dark nebulae.
Pirogov Lev E.
Zinchenko I. I.
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