Please use this identifier to cite or link to this item: http://hdl.handle.net/2381/26752
 Title: X-ray absorption in distant type II QSOs Authors: Krumpe, M.Lamer, G.Schwope, A. D.Corral, A.Carrera, F. J.Barcons, X.Page, M.Mateos, S.Tedds, Jonathan A.Watson, M. G. First Published: 1-May-2008 Publisher: EDP Sciences for European Southern Observatory (ESO) Citation: Astronomy & Astrophysics, 2008, 483 (2), pp. 415-424 Abstract: Aims. We present the results of the X-ray spectral analysis of an XMM-Newton-selected type II QSO sample with z $\ge$ 0.5 and 0.5-10 keV flux of 0.3-33$\times$10-14 erg/s/cm2. The distribution of absorbing column densities in type II QSOs is investigated and the dependence of absorption on X-ray luminosity and redshift is studied. Methods. We inspected 51 spectroscopically classified type II QSO candidates from the XMM-Newton Marano field survey, the XMM-Newton-2dF wide angle survey (XWAS), and the AXIS survey to set-up a well-defined sample with secure optical type II identifications. Fourteen type II QSOs were classified and an X-ray spectral analysis performed. Since most of our sources have only ~40 X-ray counts (PN-detector), we carefully studied the fit results of the simulated X-ray spectra as a function of fit statistic and binning method. We determined that fitting the spectra with the Cash-statistic and a binning of minimum one count per bin recovers the input values of the simulated X-ray spectra best. Above 100 PN counts, the free fits of the spectrum's slope and absorbing hydrogen column density are reliable. Results. We find only moderate absorption ($N_{\rm H}$ = (2-10)$\times$1022 cm-2) and no obvious trends with redshift and intrinsic X-ray luminosity. In a few cases a Compton-thick absorber cannot be excluded. Two type II objects with no X-ray absorption were discovered. We find no evidence for an intrinsic separation between type II AGN and high X-ray luminosity type II QSO in terms of absorption. The stacked X-ray spectrum of our 14 type II QSOs shows no iron K$\alpha$ line. In contrast, the stack of the 8 type II AGN reveals a very prominent iron K$\alpha$ line at an energy of ~6.6 keV and an EW ~ 2 keV. DOI Link: 10.1051/0004-6361:20079012 ISSN: 0004-6361 eISSN: 1432-0746 Links: http://hdl.handle.net/2381/26752http://www.aanda.org/articles/aa/abs/2008/20/aa9012-07/aa9012-07.html Version: Publisher Version Status: Peer-reviewed Type: Journal Article Rights: Copyright © 2008 ESO. Reproduced with permission from Astronomy & Astrophysics, © ESO. Appears in Collections: Published Articles, Dept. of Physics and Astronomy

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