Abstract

We review the most important findings on AGN physics and cosmological evolution as obtained by extragalactic X-ray surveys and associated multiwavelength observations. We briefly discuss the perspectives for future enterprises and in particular the scientific case for an extremely deep (2-3 Ms) XMM survey.Comment: 5 pages, 4 figures, review talk at the conference: "XMM-Newton: the next decade", updated to match version in pres

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