The density and masses of obscured Black Holes

Details The density and masses of obscured Black Holes The density and masses of obscured Black Holes

2004-04-02

arxiv.org/abs/astro-ph/0404047v1

Astrophys.Space Sci. 294 (2004) 63-69

Astronomy and Astrophysics

Astrophysics

8 pages, 4 figures, to appear in the proceedings of the meeting "Baryons on Cosmic Structures", Roma, October 20-21, 2003

Scientific paper

10.1007/s10509-004-4023-5

Recent Chandra and XMM-Newton surveys have uncovered a large fraction of the obscured AGN responsible of the hard X-ray background. One of the most intriguing results of extensive programs of follow-up observations concerns the optical and near-infrared properties of the hard X-ray sources counterparts. More specifically, for a significant fraction of hard X-ray obscured sources the AGN responsible of the high X-ray luminosity remains elusive over a wide range of wavelengths from soft X-rays to near-infrared. This very observational result opens the possibility to investigate the host of bright obscured quasars in some detail. Here we briefly report on some preliminar results obtained for a small sample of elusive AGN in the HELLAS2XMM survey.

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