Extragalactic Hard X-ray Surveys: From INTEGRAL to Simbol-X
S. Paltani (ISDC, University of Geneva), T. Dwelly (University of, Southampton), R. Walter (ISDC, University of Geneva), A. P. Marscher, S. G., Jorstad (Boston University), I. M. McHardy (University of Southampton), T., J.-L. Courvoisier (ISDC, University of Geneva)
TL;DR
This paper reports on deep extragalactic X-ray surveys with INTEGRAL, revealing a high fraction of absorbed AGN and the potential of future Simbol-X surveys to study AGN evolution up to redshift 2.
Contribution
It provides new insights into AGN absorption properties and demonstrates the promising capabilities of Simbol-X for future high-redshift AGN studies.
Findings
High fraction of absorbed AGN in deep INTEGRAL survey
No observed decrease in absorption fraction with luminosity
Simbol-X can detect many AGN up to redshift 2
Abstract
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.
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