The AGN content of hard X-ray surveys
Abstract
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.
Cite
@article{arxiv.astro-ph/0112293,
title = {The AGN content of hard X-ray surveys},
author = {A. Comastri and C. Vignali and M. Brusa},
journal= {arXiv preprint arXiv:astro-ph/0112293},
year = {2019}
}
Comments
10 pages, 5 figures, LateX, newpasp.sty and graphicx.sty macros. Invited review talk, to appear in the proceedings of "AGN Surveys" (IAU Colloquium 184, June, 18-22 2001, Byurakan, Armenia)