Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979azh....56...60e&link_type=abstract
Astronomicheskii Zhurnal, vol. 56, no. 1, 1979, p. 60-66. In Russian.
Astronomy and Astrophysics
Astronomy
Astronomical Spectroscopy, Gas Density, Gas Temperature, Interstellar Gas, Molecular Spectra, Carbon Compounds, Clouds, Line Spectra, Molecular Rotation, Optical Thickness, Sulfides
Scientific paper
Estimates of the kinetic temperature, gas density, and total number of molecules of a given type along the line of sight to a molecular cloud are investigated which are obtained from observations made in several optically thin molecular lines due to CO, CS, or SiO. A cloud is considered in which the radiation field is governed mainly by the microwave background and the radiation temperature in all optically thin lines is nearly the same and approximately equal to the background temperature of 2.76 K. A simple procedure is outlined for the direct determination of interstellar-gas kinetic temperature and density from observations of the intensities of molecular lines with optical depths less than unity. This procedure is illustrated by mapping the density distribution of CS molecules in the central regions of the OMC 2 and M17 molecular clouds.
Everskaia I. L.
Khersonskii V. K.
Varshalovich Dmitry A.
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