The evolution of the diffuse cosmic ultraviolet background constrained by the Hubble Space Telescope observations of 3C 273

Details The evolution of the diffuse cosmic ultraviolet background constrained by the Hubble Space Telescope observations of 3C 273 The evolution of the diffuse cosmic ultraviolet background constrained by the Hubble Space Telescope observations of 3C 273

Nov 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...381l...1i&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 381, Nov. 1, 1991, p. L1-L4.

Astronomy and Astrophysics

Astrophysics

34

Background Radiation, Cosmic Rays, Evolution (Development), Hubble Space Telescope, Quasars, Ultraviolet Spectroscopy, Absorption Spectra, Astronomical Spectroscopy, Cosmology, Lyman Alpha Radiation, Red Shift

Scientific paper

Results are presented of recent HST UV spectroscopy of 3C 273, which revealed more low-redshift Lyman-alpha absorption lines (IGM clouds) than expected from the extrapolation from high-redshift (not less than 1.6) observations. It is shown on the basis of the standard pressure confined cloud model of the Lyman-alpha forest that this result indicates a sharp drop in the diffuse cosmic UV background from 2 to 0 redshift. It is predicted that the H I optical depth will drop slowly or perhaps even increase with decreasing redshift at less than 2 redshift. The implied constraints on the density and pressure of the diffuse IGM at 0 redshift are also derived. The inferred evolution of the diffuse UV flux bears a striking resemblance to the most recent direct determinations of the volume emissivity of the quasar population.

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