On the physical state of QSO Lyman-alpha absorption clouds

Arguments are presented that QSO Lyman-alpha absorption lines might arise in denser environments than is usually thought, with a larger neutral fraction in the gas than in the usual models of rarefied intergalactic clouds, and a much smaller total mean mass density in Lyman-alpha clouds. A model is...

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Veröffentlicht in:	Astrophys. J.; (United States) 1987-05, Vol.316 (2), p.L59-L61
1. Verfasser:	Hogan, Craig J.
Format:	Artikel
Sprache:	eng
Schlagworte:	640102 - Astrophysics & Cosmology- Stars & Quasi-Stellar, Radio & X-Ray Sources ABSORPTION SPECTRA Astronomy Astrophysics CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS COSMIC GASES COSMIC RADIO SOURCES Earth, ocean, space Exact sciences and technology FLUIDS GASES GRAVITATIONAL COLLAPSE LYMAN LINES MASS QUASARS Quasars. Active or peculiar galaxies, objects, and systems SPECTRA Stellar systems. Galactic and extragalactic objects and systems. The universe
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container_title	Astrophys. J.; (United States)
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creator	Hogan, Craig J.
description	Arguments are presented that QSO Lyman-alpha absorption lines might arise in denser environments than is usually thought, with a larger neutral fraction in the gas than in the usual models of rarefied intergalactic clouds, and a much smaller total mean mass density in Lyman-alpha clouds. A model is sketched in which collapse or collision of thermally unstable protogalactic clouds forms shocks which trigger the collapse of cool thin sheets. The statistical properties of absorption lines formed in this way are consistent with those of the observed Lyman-alpha forest.
doi_str_mv	10.1086/184892
format	Article
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subjects	640102 - Astrophysics & Cosmology- Stars & Quasi-Stellar, Radio & X-Ray Sources ABSORPTION SPECTRA Astronomy Astrophysics CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS COSMIC GASES COSMIC RADIO SOURCES Earth, ocean, space Exact sciences and technology FLUIDS GASES GRAVITATIONAL COLLAPSE LYMAN LINES MASS QUASARS Quasars. Active or peculiar galaxies, objects, and systems SPECTRA Stellar systems. Galactic and extragalactic objects and systems. The universe
title	On the physical state of QSO Lyman-alpha absorption clouds
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