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Extragalactic hard X-ray source counts with INTEGRAL observatory: A Progress Report

Published online by Cambridge University Press:  12 May 2006

R. Krivonos ,
M. Revnivtsev ,
S. Sazonov ,
E. Churazov  and
R. Sunyaev
R. Krivonos
Affiliation:
Space Research Institute, Moscow, Russia Max-Planck Institut für Astrophysik, Garching, Germany
M. Revnivtsev
Affiliation:
Space Research Institute, Moscow, Russia Max-Planck Institut für Astrophysik, Garching, Germany
S. Sazonov
Affiliation:
Space Research Institute, Moscow, Russia Max-Planck Institut für Astrophysik, Garching, Germany
E. Churazov
Affiliation:
Space Research Institute, Moscow, Russia Max-Planck Institut für Astrophysik, Garching, Germany
R. Sunyaev
Affiliation:
Space Research Institute, Moscow, Russia Max-Planck Institut für Astrophysik, Garching, Germany
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Abstract

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We present results from the hard X-ray sky survey being performed with INTEGRAL observatory. During two years of operation the significant sky area was covered with moderate sensitivity which now allows us to estimate surface number density of Active Galactic Nuclei (AGN) in hard (17-60 keV) energy band. Our catalog of detected sources comprises $>60$ AGN with wide range of intrinsic absorption. We used $24000 deg^{2}$ sky coverage (high Galactic latitude observations) with total exposure $>2$ Msec to derive source number-flux relation. The estimated surface density of extragalactic hard X-ray sources with flux $>10^{-11}$ erg s$^{-1}$ cm$^{-2}$ is $(1.0 \pm 0.5) 10^{-2} deg^{-2}$.

Keywords

Galaxies: active - Galaxies: Seyfert - Gamma rays: observations - X-rays: galaxies
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 1 , Symposium S230: Populations of High Energy Sources in Galaxies , August 2005 , pp. 455 - 458
Copyright
2006 International Astronomical Union