Extragalactic hard X-ray surveys: from INTEGRAL to Simbol-X
Marscher, A. P.
Jorstad, S. G.
McHardy, I. M.
Courvoisier, T. J.-L.
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Citation (published version)S. Paltani, T. Dwelly, R Walter, A. P. Marscher, S. G. Jorstad, I.M. McHardy, T. J-L Courvoisier. "Extragalactic Hard X-ray Surveys: From INTEGRAL to Simbol-X." AIP Conference Proceedings, v. 1126, pp. 108 - 111.
We present some results of the deepest extragalactic survey performed by the INTEGRAL satellite. The fraction of very absorbed AGN is quite large. The sharp decrease in the absorption fraction with X-ray luminosity observed at lower-energy X-rays is not observed. The current lack of truly Compton-thick objects, with an upper limit of 14% to the size of this population, is just compatible with recent modeling of the cosmic X-ray background. We also study the prospects for a future hard X-ray serendipitous survey with Simbol-X. We show that Simbol-X will easily detect a large number of serendipitous AGN, allowing us to study the evolution of AGN up to redshifts about 2, opening the door to the cosmological study of hard X-ray selected AGN, which is barely possible with existing satellites like Swift and INTEGRAL.