On the fraction of X-ray obscured quasars

Details On the fraction of X-ray obscured quasars On the fraction of X-ray obscured quasars

2007-02-27

arxiv.org/abs/astro-ph/0702701v1

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures, Conference proceedings to appear in "The Central Engine of Active Galactic Nuclei", ed. L. C. Ho and J.-M.

Scientific paper

Various studies have claimed that the fraction of obscured AGN drops with
luminosity, but contrary results are also reported. We present our recent
studies on the fraction of X-ray obscured quasars in Chandra Deep Fields and in
the local universe showing that most quasars in CDFs (at redshift of 1 ~ 4) are
obscured and a consistent pattern in the local universe.

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