The X-ray background and the evolution of AGN
Astrophysics
2007-05-23 v1
Abstract
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.
Cite
@article{arxiv.astro-ph/9909390,
title = {The X-ray background and the evolution of AGN},
author = {Fulvio Pompilio and Fabio La Franca and Giorgio Matt},
journal= {arXiv preprint arXiv:astro-ph/9909390},
year = {2007}
}
Comments
8 pages, 7 figures, accepted for pubblication in A&A