The AGN content of hard X-ray surveys

Details The AGN content of hard X-ray surveys The AGN content of hard X-ray surveys

2001-12-12

arxiv.org/abs/astro-ph/0112293v1

Astronomy and Astrophysics

Astrophysics

10 pages, 5 figures, LateX, newpasp.sty and graphicx.sty macros. Invited review talk, to appear in the proceedings of "AGN Sur

Scientific paper

Multiwavelength observations of the hard X-ray selected sources discovered by BeppoSAX, Chandra and XMM-Newton surveys have significantly improved our knowledge of the AGN population. The increasing number of X-ray obscured AGN so far discovered confirms the prediction of those AGN synthesis models for the X-ray background based on the Unified scheme. However, follow-up optical observations of hard X-ray selected sources indicate that their optical properties are quite varied and the simple relations between optical and X-ray absorption are by no means without exception. Moreover, there is evidence of a substantial number of luminous X-ray sources hosted by apparently normal galaxies. In this paper the results obtained from multiwavelength observations of hard X-ray selected sources discovered by BeppoSAX and XMM-Newton are presented and briefly discussed.

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