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Cosmological Evolution of X-ray Selected AGNs and Synthesis of the X-ray Background

Published online by Cambridge University Press:  25 July 2014

Yoshihiro Ueda ,
Masayuki Akiyama ,
Günther Hasinger ,
Takamitsu Miyaji  and
Michael G. Watson
Yoshihiro Ueda
Affiliation:
Department of Astronomy, Kyoto University, Japan email: [email protected]
Masayuki Akiyama
Affiliation:
Astronomical Institute, Tohoku University, Japan
Günther Hasinger
Affiliation:
Institute for Astronomy, University of Hawaii, USA
Takamitsu Miyaji
Affiliation:
Instituto de Astronomía, Universidad Nacional Autónoma de México, Mexico
Michael G. Watson
Affiliation:
Department of Physics and Astronomy, University of Leicester, UK
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Abstract

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X-ray surveys provide us with one of the least biased samples of Active Galactic Nuclei (AGNs) against obscuration. Here we present the most up-to-date AGN X-ray luminosity function (XLF) and absorption function over the redshift range from 0 to 5, using the largest, highly complete sample ever available obtained from surveys of various depth, depth, and energy bands. We utilize a maximum likelihood method to reproduce the count-rate versus redshift distribution for each survey, by taking into account the evolution of the absorbed fraction, contribution from Compton-thick AGNs, and AGN broad band X-ray spectra including reflection components from tori based on the luminosity and redshift dependent unified scheme. We find that the shape of the XLF at z ~ 1–3 is significantly different from that in the local universe, for which the luminosity dependent density evolution (LDDE) model gives the best description. These results establish the standard population synthesis model of the X-Ray Background (XRB), which well reproduces the source counts in both soft and hard bands, the observed fractions of Compton-thick AGNs, and the spectrum of the XRB.

Keywords

galaxies: activeX-rays: diffuse background
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Symposium S304: Multiwavelength AGN Surveys and Studies , October 2013 , pp. 125 - 131
Copyright
Copyright © International Astronomical Union 2014 

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