The integrated ultraviolet radiation field from QSOs

Details The integrated ultraviolet radiation field from QSOs The integrated ultraviolet radiation field from QSOs

Apr 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...315..180b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 315, April 1, 1987, p. 180-197.

Astronomy and Astrophysics

Astrophysics

154

Far Ultraviolet Radiation, Luminosity, Quasars, Active Galactic Nuclei, Elliptical Galaxies, Galactic Radiation, Intergalactic Media, Lyman Alpha Radiation, Metallicity, Red Shift

Scientific paper

The contribution of QSOs to the integrated diffuse far-ultraviolet radiation field as a function of redshift is calculated. As expected, the calculated value of the specific intensity, Jv(z), is strongly dependent on the QSO luminosity function, especially at high redshifts, whereas the spectral shape is mostly dependent on the adopted form for the intrinsic UV spectrum of the individual QSOs. It is estimated that uncertainties in the luminosity function of the low-luminosity AGN introduce uncertainties of up to a factor of nine in Jv. Continuous absorption by the neutral hydrogen associated with intervening galaxies attenuates Jv by a factor of 3-5 at 912 A. At shorter wavelengths, Jv is attenuated by a factor of 2-5 depending on the value of He I:He II adopted for the intervening systems. The implications of the uncertainties in Jv(z) for the analysis of observations of the Lyman-alpha forest clouds and the detectability of the associated He I and He II absorption with the Hubble Space Telescope are discussed.

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