Other
Scientific paper
Sep 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...332..543h&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 332, Sept. 15, 1988, p. 543-574.
Other
80
Astronomical Models, Intergalactic Media, Interstellar Extinction, Quasars, Absorption Spectra, Lyman Alpha Radiation, Magnesium, Red Shift
Scientific paper
A model for dust obscuration is proposed to account for the apparent lack of high-redshift quasars which are assumed to exist, but to be obscured by dust in intervening galaxies. The onset of dust obscuration is quite sudden with optical depth τ ∝ (1+z)2.5. Properties of the hypothesized intervening dusty galaxies are constrained to produce a sky-covering factor similar to that found for damped Lyα or Mg II absorption lines in high-redshift quasar spectra. The model successfully reproduces the apparent magnitude and redshift distributions of observed quasar samples. Since X-rays penetrate the dust, the predicted 2 - 10 keV X-ray flux of quasars with an absolute blue magnitude brighter than -21.5 is larger than it would otherwise be and equals 82% of the observed background. Quasars are also found to produce a substantial fraction of the 100 MeV γ-ray background. The predictions in the radio are consistent with the observations of QSOs in the Parkes radio survey.
Heisler Julia
Ostriker Jeremiah P.
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