Obscured AGN in Multiwavelength Surveys
Memorie della Societa Astronomica Italiana(2004)
Abstract
Using a simple unification model for AGN, with a fixed ratio of obscured to
unobscured AGN of 3:1, we explain the X-ray, optical and infrared properties of
the X-ray sources in the GOODS fields. That is, the GOODS data are consistent
with the existence of a large population of obscured AGN out to high redshifts.
About half of these are so obscured that they are missed even by hard X-ray
observations, and are detected only in deep infrared observations. The
previously reported decreasing trend of obscured to total AGN ratio with
increasing X-ray luminosity can be explained entirely as a selection effect.
MoreTranslated text
Key words
infrared,selection effect,x ray optics
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