How fast is the evolution of the diffuse ultraviolet cosmic background radiation?

Details How fast is the evolution of the diffuse ultraviolet cosmic background radiation? How fast is the evolution of the diffuse ultraviolet cosmic background radiation?

Nov 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.259..247s&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 259, no. 2, p. 247-250.

Astronomy and Astrophysics

Astronomy

1

Background Radiation, Diffuse Radiation, Intergalactic Media, Quasars, Relic Radiation, Ultraviolet Radiation, Astronomical Models, Lyman Alpha Radiation, Ultraviolet Spectra

Scientific paper

Ly-alpha absorption lines observed in HST UV spectra of 3C 273 have neutral hydrogen column densities comparable with those of z approximatelt equal to 2 quasars. Assuming the standard pressure-confined model of Ly-alpha clouds, we use this fact to determine the evolution of UV background radiation for z of less than 2. We find that to fit the data the UV background must evolve as (1 + z) exp 5.0 +/- 1.2 for z of less than 2. We also give constraints on the present value of the pressure of the intergalactic medium.

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