The X-ray background and the evolution of AGN

Details The X-ray background and the evolution of AGN The X-ray background and the evolution of AGN

1999-09-23

arxiv.org/abs/astro-ph/9909390v1

Astronomy and Astrophysics

Astrophysics

8 pages, 7 figures, accepted for pubblication in A&A

Scientific paper

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.

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