INTEGRAL/IBIS Extragalactic survey: 20-100 keV selected AGN
Abstract
Analysis of INTEGRAL Core Program and public Open Time observations performed up to April 2005 provides a sample of 62 active galactic nuclei in the 20-100 keV band above a flux limit of ~1.5x10^-11 erg/cm2/s. Most(42) of the sources in the sample are Seyfert galaxies, almost equally divided between type 1 and 2 objects, 6 are blazars and 14 are still unclassified. Excluding the blazars, the average redshift of our sample is 0.021 while the mean luminosity is Log(L) = 43.45. We find that absorption is present in 65% of the objects with 14% of the total sample due to Compton thick active galaxies. In agreement with both Swift/BAT team results and 2-10 keV studies, the fraction of absorbed objects decreases with the 20-100 keV luminosity. All Seyfert 2s in our sample are absorbed as are 33% of Seyfert 1s. The present data highlight the capability of INTEGRAL to probe the extragalactic gamma-ray sky and to find new and/or absorbed active galaxies.
Cite
@article{arxiv.astro-ph/0512015,
title = {INTEGRAL/IBIS Extragalactic survey: 20-100 keV selected AGN},
author = {L. Bassani and M. Molina and A. Malizia and J. B. Stephen and A. J. Bird and A. Bazzano and G. Belanger and A. J. Dean and A. De Rosa and P. Laurent and F. Lebrun and P. Ubertini and R. Walter},
journal= {arXiv preprint arXiv:astro-ph/0512015},
year = {2009}
}
Comments
4 pages, 3 figures, 1 table. To be published in ApJ Letters