Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-06-19
Astronomy and Astrophysics
Astrophysics
14 pages, 9 figures, A&A accepted
Scientific paper
10.1051/0004-6361:20054632
We combine bright XMM data with the Chandra Deep Field South observations in order to explore the behavior of the intrinsic AGN absorption, as a function of redshift and luminosity.Our sample consists of 359 sources selected in the hard 2-8 keV band, spanning the flux range 6\times10^{-16}-$3\times10^{-13} erg s^-1 cm^-2 with a high rate of spectroscopic or photometric redshift completeness (100 and 85 per cent respectively for the Chandra and XMM data. We derive the column density values using X-ray spectral fits. We find that the fraction of obscured AGN falls with increasing luminosity in agreement with previous findings. The fraction of obscured AGN shows an apparent increase at high redshifts (z>2). Simulations show that this effect can be most probably attributed to the fact that at high redshifts the column densities are overestimated.
Akylas Athanassios
Georgakakis Antonis
Georgantopoulos Ioannis
Hatziminaoglou Evanthia
Kitsionas Spyridon
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