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Some observational consequences of residual H I in galactic molecular clouds

1981; IOP Publishing; Volume: 246; Linguagem: Inglês

10.1086/158899

1538-4357

H. S. Liszt, W. B. Burton, T. M. Bania,

Atmospheric Ozone and Climate

view Abstract Citations (47) References (9) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Some observational consequences of residual H I in galactic molecular clouds Liszt, H. S. ; Burton, W. B. ; Bania, T. M. Abstract 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. Publication: The Astrophysical Journal Pub Date: May 1981 DOI: 10.1086/158899 Bibcode: 1981ApJ...246...74L Keywords: 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; Astronomy full text sources ADS |