Astronomy and Astrophysics – Astronomy
Scientific paper
May 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...246...74l&link_type=abstract
Astrophysical Journal, Part 1, vol. 246, May 15, 1981, p. 74-85.
Astronomy and Astrophysics
Astronomy
40
Hydrogen Clouds, Interstellar Gas, Milky Way Galaxy, Molecular Clouds, Radio Sources (Astronomy), Absorption Spectra, Carbon Monoxide, Centimeter Waves, Emission Spectra, Line Spectra, Self Absorption, Spectrum Analysis
Scientific paper
The presence of a residue of cold H I in galactic molecular clouds has several demonstrable effects on low-latitude H I line profiles. Molecular clouds are responsible for narrow, well-defined H I self-absorption features, for much of the small-scale scatter in measured H I terminal velocities, and for some of the general lumpiness in the H I emission structure. In the inner Galaxy, they appear to have a general blanketing effect on H I intensities observed near the terminal velocity, thus changing fundamentally the entire positive-velocity structure of the H I line profiles and their macroscopic optical-depth properties. On the smallest accessible observational scales, the perceived emission characteristics of CO and H I are often strongly anticorrelated; as the observed scales become larger, the emission characteristics of the two species become increasingly similar.
Bania Thomas M.
Burton William Butler
Liszt Harvey Steven
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