The X-ray background and the evolution of AGN

We discuss the constraints on the AGN evolution from the cosmic X-ray background and source counts. A synthesis model to fit the X-ray background is presented. In the model, the spectrum of type 2 AGN has been modeled including Compton down--scattering within the absorbing material. Besides, we intr...

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Bibliographic Details
Published in:arXiv.org 1999-09
Main Authors: Pompilio, Fulvio, Fabio La Franca, Giorgio, Matt
Format: Article
Language:English
Subjects:
Background radiation
Dependence
Elastic scattering
Evolution
Red shift
Online Access:Get full text
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Summary:We discuss the constraints on the AGN evolution from the cosmic X-ray background and source counts. A synthesis model to fit the X-ray background is presented. In the model, the spectrum of type 2 AGN has been modeled including Compton down--scattering within the absorbing material. Besides, we introduced a dependence on redshift of the relative number of obscured sources and found a decrease of the fraction of type 2 AGN at redshifts larger than 2.
ISSN:2331-8422