Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.260..617m&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 260, no. 3, p. 617-624.
Astronomy and Astrophysics
Astronomy
54
Absorption Spectra, Astronomical Models, Dark Matter, Galactic Halos, Intergalactic Media, Lyman Alpha Radiation, Cosmic Gases, Gravitational Lenses, Quasars, Red Shift
Scientific paper
According to the minihalo model for the Ly a forest, the absorption lines arise from photoionized gas gravitationally confined in dark matter haloes of low velocity-dispersion. Possible tests for this hypothesis are analyzed. The predicted column density distribution is mostly dependent on the density profile of the haloes, and is in basic agreement with the observations. At low column densities, the lines should be probing the infalling, nonvirialized regions of the clouds, and they should deviate from Voigt profiles. The Gunn-Peterson absorption should also fluctuate with wavelength, and it may thus be difficult to distinguish from a superposition of many weak absorption lines. We give an approximate estimate of the relation between the Gunn-Peterson optical depth and the observed average decrement produced by the absorption lines in the Ly-alpha forest.
Miralda-Escude' Jordi
Rees Martin J.
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