Molecular and atomic clouds associated with infrared cirrus in Ursa Major

Details Molecular and atomic clouds associated with infrared cirrus in Ursa Major Molecular and atomic clouds associated with infrared cirrus in Ursa Major

Aug 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...319..723d&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 319, Aug. 15, 1987, p. 723-729.

Astronomy and Astrophysics

Astronomy

153

Astronomical Spectroscopy, Atomic Spectra, Eclipsing Binary Stars, Hydrogen Clouds, Infrared Spectra, Molecular Clouds, Carbon Monoxide, Infrared Astronomy Satellite, Milky Way Galaxy, Nebulae, Optical Thickness

Scientific paper

Observations of CO and H I revealed that in Ursa Major the high-latitude far-infrared 'cirrus' emission discovered by the Infrared Astronomical Satellite comes from molecular and atomic clouds. These clouds differ sufficiently from the large clouds in the Galactic plane so that the ratio of H2 column density to velocity-integrated CO radiation temperature, N(H2)/W(CO), derived from Galactic plane surveys, may not apply to them. On the assumption of a constant gas-to-dust ratio, it is argued that the cirrus emission in Ursa Major is a good mass tracer, since both the atomic and the molecular gas are probably optically thin at visual wavelengths, and the grains are heated not by local sources but by the background field of Galactic starlight. The N(H2)/W(CO) ratio thus derived for those diffuse clouds, is significantly lower than the ratio applicable to Galactic plane surveys.

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