Lyman-alpha depression of the continuum from high-redshift quasars - A new technique applied in search of the Gunn-Peterson effect

Details Lyman-alpha depression of the continuum from high-redshift quasars - A new technique applied in search of the Gunn-Peterson effect Lyman-alpha depression of the continuum from high-redshift quasars - A new technique applied in search of the Gunn-Peterson effect

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...376...33j&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 376, July 20, 1991, p. 33-42.

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95

Gunn Effect, Intergalactic Media, Lyman Alpha Radiation, Opacity, Quasars, Red Shift, Computational Astrophysics, Electromagnetic Absorption, Luminous Intensity, Stellar Spectra

Scientific paper

A subtraction of the mean absorption due to distinct clouds and a novel method for intensity-distribution examination are presently applied to all extant data bearing on the opacity due to smoothly distributed hydrogen absorption of the local Ly-alpha wavelength. It is found that, at z of about 3, the data imply 30 percent more opacity than in measurable lines; this could be due to either lines of very small column density or to true continuous absorption. At z above 4, the total absorption is larger by 20 percent + or - 30 percent than a simple extrapolation from lower redshift data, implying a limit of 15 percent reduction in the ionizing background for z of 3-4.5.

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