Lyman alpha emission from thick clouds photoionized by the metagalactic radiation

Details Lyman alpha emission from thick clouds photoionized by the metagalactic radiation Lyman alpha emission from thick clouds photoionized by the metagalactic radiation

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....105..797b&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 105, no. 3, p. 797-815.

Astronomy and Astrophysics

Astronomy

30

Galactic Radiation, Line Spectra, Lyman Alpha Radiation, Nebulae, Photoionization, Red Shift, Background Radiation, Brightness Distribution, Optical Thickness

Scientific paper

Calculations of Lyman-alpha surface brightness and spectral line profiles from thick massive clouds at high red shift that have been photoionized by the metagalactic background radiation are presented; these are relevant to the Sunyaev-Zel'dovich theory of cluster formation. For quasar metagalactic fluxes, two energy distributions are used: a power law with index -1, and a distribution in which the ionizing background arises from emission filtered by dust in intervening galaxies and by Lyman-alpha forest clouds. In a metagalactic flux dominated by stars, recombination dominates Lyman-alpha production. Two different methods are used to estimate the Lyman-alpha emissivity at high red shift arising from the reprocessing of the metagalactic ionizing flux by optically thick clouds, and the contribution to the night sky brightness by the Lyman-alpha photons.

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