Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...234..111r&link_type=abstract
Astrophysical Journal, Part 1, vol. 234, Nov. 15, 1979, p. 111-128.
Astronomy and Astrophysics
Astronomy
47
Cosmic Dust, Infrared Astronomy, Interstellar Gas, Milky Way Galaxy, Molecular Gases, Brightness Temperature, Color-Color Diagram, Distribution (Property), Far Infrared Radiation, H Ii Regions, Infrared Spectra, Tables (Data)
Scientific paper
The mean properties of hot-centered and cold dust/molecular clouds are estimated, and their relationship to each other and contribution to the mass of the Galaxy are discussed. Reference is made to the properties of strong, confirmed AFGL 20-micron sources identified with H II regions having delta greater than -30 deg, and to some weaker sources. A 20 micron-100 micron-1 mm color-color diagram for hot-centered clouds suggests a mass-weighted mean dust temperature in the 40-60 K range. From a comparison of the density of the clouds derived from far IR and from CO observations as well as from dynamical arguments, a (C-13)O/H2 of about 5 x 10 to the -7th power is deduced for hot-centered clouds. Attention is given to the local surface density of Lynds clouds, as well as to the equilibrium of the more massive cold clouds and the means of their support against gravitational collapse. It is indicated that there are about 2 million cold clouds in the Galaxy, with a total mass of about 2 billion solar masses.
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