Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-09-03
Nucl.Phys.Proc.Suppl.132:232-235,2004
Astronomy and Astrophysics
Astrophysics
6 pages, 6 figures. Proceedings of the symposium "The Restless High-Energy Universe", 5-8 May 2003, Amsterdam, The Netherlands
Scientific paper
10.1016/j.nuclphysbps.2004.04.04
We present first results of the X-ray spectral analysis of the 500 ksec deep survey obtained with XMM-Newton on the Chandra Deep Field South (CDFS). Statistical distributions of spectral index and intrinsic absorption are derived for a sample containing 70 sources with a count limit of 100 (flux limit in the [2-10] keV band of 8.9 $\times 10^{-16}$ erg cm$^{-2}$ s$^{-1}$), of which 44 have redshift identification. We observe a separation between the type-1 and the type-2 AGN in diagnostics involving different X-ray parameters. Using the subsample with known $z$, we show that this separation between the AGN populations is a consequence of different absorption column densities. The two populations have the same average spectral index, $<\Gamma> = 2 \pm 0.1$. We present integrated spectrum for the most distant type-2 QSO whith strong X-ray absorption and a clear soft excess; we obtained the best fit for these objects with two difference models: a scattering model and a double power law model. We also confirm a progressive hardening for the combined integrated spectra for faint objects which at first was noted by \cite{toz01a}. Our results shown a clear evolution of decrease of $<\Gamma>$ with decreasing flux in the hard 2-10 keV band. However, we detect not only a regular increase of $<\Gamma>$ for different subsamples of fluxes in comparison with Chandra results, but also an internal discrepancy of the values, if we fitted in the different energy bands.
Bergeron Jacqueline
Brunner Hermann
Finoguenov Alexis
Hasinger Guenter
Mainieri Vincenzo
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