On the physical state of QSO Lyman-alpha absorption clouds

Details On the physical state of QSO Lyman-alpha absorption clouds On the physical state of QSO Lyman-alpha absorption clouds

May 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...316l..59h&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 316, May 15, 1987, p. L59-L61. Research supported b

Astronomy and Astrophysics

Astrophysics

23

Hydrogen Clouds, Intergalactic Media, Lyman Alpha Radiation, Quasars

Scientific paper

Arguments are presented that QSO Lyman-α 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-α 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-α forest.

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