Absorption-line profiles of expanding intergalactic clouds

Details Absorption-line profiles of expanding intergalactic clouds Absorption-line profiles of expanding intergalactic clouds

Jul 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...294..517s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 294, July 15, 1985, p. 517-522.

Astronomy and Astrophysics

Astrophysics

Absorption Spectra, Astronomical Models, Distribution Functions, Intergalactic Media, Lyman Alpha Radiation, Size Distribution, Density Distribution, Gas Expansion, Mass Distribution, Optical Thickness, Spectral Line Width

Scientific paper

Power-law radius and density distribution functions for intergalactic clouds are calculated from statistical data on high-redshift Lyman-alpha absorption toward quasars by convolution with theoretical absorption-profile models, as proposed by Sherman (1984). Expressions are derived for arbitrary values of optical thickness, temperature, and expansion velocity, and the best fit to the observations is obtained at cloud radius 3 kpc or greater and density 0.003/cu cm or more at z = 2. It is considered unlikely that the line broadening seen in the observations can be attributed to the expansion of intergalactic clouds.

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