Were the Lyman-alpha clouds formed from shocks?

Details Were the Lyman-alpha clouds formed from shocks? Were the Lyman-alpha clouds formed from shocks?

Aug 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...319...14v&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 319, Aug. 1, 1987, p. 14-27.

Astronomy and Astrophysics

Astrophysics

19

Astronomical Models, Intergalactic Media, Lyman Alpha Radiation, Molecular Clouds, Shock Waves, Background Radiation, Quasars, Red Shift, Ultraviolet Radiation

Scientific paper

The hypothesis that the Lyman-alpha clouds are fragments from shock waves in the intergalactic medium (IGM) is examined using a series of approximate analytical arguments. The typical cloud properties are examined in terms of the shock wave properties. The favored model is one where the clouds form at a redshift between four and nine. Models in which a moderate UV background is present are slightly more favorable for cloud formation. The energy required per seed explosion is between 3 x 10 to the 54th and 2 x 10 to the 58th ergs. The fraction of the matter in the universe contained in the IGM must be between 0.01 and 0.001. The lack of correlation in the cloud redshifts must result from the destruction of the clouds in high-density regions. The necessary density of explosive 'seeds' is comparable to the density of normal galaxies. An observational test of this picture is proposed.

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