Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-08-23
Mon.Not.Roy.Astron.Soc.372:1755-1775,2006
Astronomy and Astrophysics
Astrophysics
24 pages, 18 figures, accepted by MNRAS
Scientific paper
10.1111/j.1365-2966.2006.10979.x
We have used very deep XMM-Newton observations of the Chandra Deep Field-South to examine the spectral properties of the faint active galactic nucleus (AGN) population. Crucially, redshift measurements are available for 84% (259/309) of the XMM-Newton sample. We have calculated the absorption and intrinsic luminosities of the sample using an extensive Monte Carlo technique incorporating the specifics of the XMM-Newton observations. Twenty-three sources are found to have substantial absorption and intrinsic X-ray luminosities greater than 10^44 erg/s, putting them in the "type-2" QSO regime. We compare the redshift, luminosity and absorption distributions of our sample to the predictions of a range of AGN population models. In contrast to recent findings from ultra-deep Chandra surveys, we find that there is little evidence that the absorption distribution is dependent on either redshift or intrinsic X-ray luminosity. The pattern of absorption in our sample is best reproduced by models in which ~75% of the AGN population is heavily absorbed at all luminosities and redshifts.
Dwelly Tom
Page Mat J.
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