On the origin of H I absorption systems of quasars

Details On the origin of H I absorption systems of quasars On the origin of H I absorption systems of quasars

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...409...42m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 409, no. 1, p. 42-59.

Astronomy and Astrophysics

Astrophysics

18

Absorption Spectra, Dark Matter, H I Regions, Intergalactic Media, Lyman Alpha Radiation, Quasars, Dwarf Galaxies, Line Spectra, Red Shift

Scientific paper

Intergalactic clouds confined by the gravity of cold dark matter (CDM), or 'minihalo' phenomenon, are presently examined as a unified model for neutral H I absorption systems of quasars. Reproduction of the number density evolution of the Ly-alpha forest and the redshift variation of the continuum depression of high-z quasars entails that minihalos undergo expansion due to increasing UV flux with decreasing redshift, at z above 2. For z below 2, the diffuse UV flux decreases, and minihalos will tend to contract.

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