Unconventional AGN in hard X-ray surveys

Abstract

Extensive programs of follow-up observations of hard X-ray selected sources have unambiguosly revealed that the sources of the X-ray background are characterized by an extremely large dispersion in their optical magnitude and spectroscopic classification. Here we present the results of an attempt to understand the nature of the observed variety using a simple prescription for their optical to X-ray energy distribution.

4 pages, 3 figures. Proc. workshop "X-ray surveys in the light of the new observatories", to be published in AN. LaTeX, an.cls included

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• The Chandra COSMOS Legacy survey: optical/IR identifications
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• The Chandra COSMOS Survey: III. Optical and Infrared Identification of X-ray Point Sources
• Chandra and Spitzer unveil heavily obscured quasars in the SWIRE/Chandra Survey
• XMM-Newton observations expose AGN in apparently normal galaxies
• Elusive AGN in the XMM-Newton bright serendipitous survey
• The Nature of Optically Dull Active Galactic Nuclei in COSMOS
• Why Optically--Faint AGN Are Faint: The Spitzer Perspective
• Chandra observations and classification of AGN-candidates correlated with Auger UHECRs
• On the Exotic Hard X-ray Source Populations in the Hellas2XMM survey