Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...327...99l&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 327, April 1, 1988, p. 99-102.
Astronomy and Astrophysics
Astrophysics
17
Absorption Spectra, Galactic Evolution, Intergalactic Media, Line Spectra, Quasars, Red Shift, H I Regions, Heavy Elements, Helium Ions, Lyman Alpha Radiation, Molecular Clouds, Universe
Scientific paper
Galaxy formation is modeled here starting from a protogalaxy as a uniform-density gaseous system in a dark halo that starts in uniform expansion, turns around, collapses, and dissipates. The analysis of this simple picture accounts for most of the properties of the QSO absorption-line systems. Two independent arguments are used to show that galaxies turned around at a redshift of two to four. The radius of maximum expansion was roughly 100 kpc. The dynamics of the collapse and the thermal instability and cloud formation that results are examined. The properties of the clouds compare favorably with the observed properties of QSO absorption-line systems. It is shown that there is a simple observational signature that will decide whether the clouds are pressure-confined by an intergalactic medium, gas gravitationally trapped in minihalos, or the products of thermally unstable protogalaxies.
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