H I superclouds in the inner Galaxy

Details H I superclouds in the inner Galaxy H I superclouds in the inner Galaxy

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...320..182e&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 320, Sept. 1, 1987, p. 182-198. NASA-supported research.

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Computation

100

Atomic Weights, Galactic Structure, H I Regions, Hydrogen Clouds, Molecular Clouds, Stellar Evolution, Carbon Monoxide, Centimeter Waves, Computational Astrophysics, Galactic Evolution, Interstellar Matter, Radio Sources (Astronomy), Spiral Galaxies

Scientific paper

Atomic hydrogen clouds in the Weaver-Williams 21 cm survey are found in the vicinity of the largest molecular cloud complexes in the first Galactic quadrant. The atomic masses are estimated in several ways, including a new method where the clouds are assumed to be composed of cool clumps immersed in a warm interclump medium. The clouds are found to contain between a million and 40 million solar masses of atoms at an average density of about 9/cu cm. They appear gravitationally bound, their molecular mass fractions decrease from 70 percent to 5 percent with increasing distance from the Galactic center, and they are located in the spiral arms. The importance of these clouds for the large-scale distributions of interstellar mass, molecular fraction, and star formation is discussed.

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