INTEGRAL/IBIS Extragalactic survey: 20-100 keV selected AGN - IN2P3 - Institut national de physique nucléaire et de physique des particules Access content directly
Journal Articles The Astrophysical Journal Year : 2006

INTEGRAL/IBIS Extragalactic survey: 20-100 keV selected AGN


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.

Dates and versions

in2p3-00186776 , version 1 (12-11-2007)



L. Bassani, M. Molina, A. Malizia, J. B. Stephen, A. J. Bird, et al.. INTEGRAL/IBIS Extragalactic survey: 20-100 keV selected AGN. The Astrophysical Journal, 2006, 636, pp.L65-L68. ⟨10.1086/500132⟩. ⟨in2p3-00186776⟩
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