期刊
ASTROPHYSICAL JOURNAL
卷 636, 期 2, 页码 L65-L68出版社
IOP PUBLISHING LTD
DOI: 10.1086/500132
关键词
galaxies : active; gamma rays : observations; surveys
Analysis of International Gamma-Ray Astrophysics Laboratory (INTEGRAL) Core Programme and public open-time observations performed up to 2005 April provides a sample of 62 active galactic nuclei in the 20 100 keV band above a flux limit of similar to 1.5 x 10(-11) ergs cm(-2) s(-1). Most ( 42) of the sources in the sample are Seyfert galaxies, almost equally divided between type 1 and type 2 objects; six 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 2's in our sample are absorbed, as are 33% of Seyfert 1's. The present data highlight the capability of INTEGRAL to probe the extragalactic gamma-ray sky and to find new and/or absorbed active galaxies.
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