The fraction of high velocity dispersion H I in the Galaxy

Details The fraction of high velocity dispersion H I in the Galaxy The fraction of high velocity dispersion H I in the Galaxy

Feb 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...289..792k&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 289, Feb. 15, 1985, p. 792-802.

Astronomy and Astrophysics

Astronomy

81

Absorption Spectra, Interstellar Gas, Milky Way Galaxy, Radio Sources (Astronomy), Cosmic Rays, H Ii Regions, Halos, Ionized Gases, Kinetic Energy

Scientific paper

It has been recently suggested that a significant fraction of the neutral hydrogen clouds in our Galaxy have a cloud-cloud velocity dispersion of 35 km s-1 (Radhakrishnan and Srinivasan). Using H I emission data, the authors find that, indeed, a detectable amount of higher than normal velocity-dispersion H I exists. However, the fraction of H I in these clouds is about an order of magnitude less than that suggested by Radhakrishnan and Srinivasan. This "fast" H I constitutes less than 5% of the volume density of the H I in the galactic plane. It probably constitutes ≤20% of the total mass of galactic H I but contains most of the kinetic energy of the ISM.

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