Probing molecular clouds

Details Probing molecular clouds Probing molecular clouds

Oct 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984fcph....9..233k&link_type=abstract

Fundamentals of Cosmic Physics (ISSN 0094-5846), vol. 9, Oct. 1984, p. 233-316.

Astronomy and Astrophysics

Astronomy

18

Astronomical Spectroscopy, Molecular Clouds, Molecular Spectra, Radio Sources (Astronomy), Stellar Evolution, Carbon Monoxide, Cosmic Dust, Galactic Structure, Interstellar Chemistry, Millimeter Waves, Molecular Excitation, Radiative Transfer, Radio Spectra

Scientific paper

The use of spectroscopic observations of various molecular species to investigate the physical properties of interstellar molecular clouds is discussed, and some results are summarized. The properties of the spectra of diatomic, symmetrical-top, and asymmetrical-top molecules are reviewed, including line strengths, fine and hyperfine structure, molecules with internal motions, and isotopic substitutions. The physics of molecular excitation and radiative transfer is introduced, and the combination of the two phenomena to determine such cloud parameters as kinetic temperature, H2 density and spatial distribution, mass, species abundances, and velocity field is explained. The results presented and illustrated with maps, photographs, graphs, and tables cover dust clouds, star formation in dark clouds, giant molecular clouds, dense cloud cores, cloud maps of the Galaxy and of other galaxies, and interstellar chemical and isotopic abundances.

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