NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-04-20 T10:01:26 PDT
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For refcode 2006ApJ...638..642B:
Retrieve 67 NED objects in this reference.
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NED Abstract

Copyright by American Astronomical Society. Reproduced by permission
2006ApJ...638..642B The First INTEGRAL AGN Catalog V. Beckmann, N. Gehrels, C. R. Shrader, and S. Soldi Abstract. We present the first INTEGRAL AGN catalog, based on observations performed from launch of the mission in 2002 October until 2004 January. The catalog includes 42 AGNs, of which 10 are Seyfert 1, 17 are Seyfert 2, and 9 are intermediate Seyfert 1.5. The fraction of blazars is rather small, with five detected objects, and only one galaxy cluster and no starburst galaxies have been detected so far. A complete subset consists of 32 AGNs with a significance limit of 7 {sigma} in the INTEGRAL ISGRI 20 -- 40 keV data. Although the sample is not flux limited, the distribution of sources shows a ratio of obscured to unobscured AGNs of 1.5 -- 2.0, consistent with luminosity-dependent unified models for AGNs. Only four Compton-thick AGNs are found in the sample. Based on the INTEGRAL data presented here, the Seyfert 2 spectra are slightly harder ({GAMMA}=1.95+/-0.01) than Seyfert 1.5 ({GAMMA}=2.10+/-0.02) and Seyfert 1 ({GAMMA}=2.11+/-0.05). Key words: Catalogs, Galaxies: Active, Galaxies: Seyfert, Gamma Rays: Observations, X-Rays: Galaxies
Retrieve 67 NED objects in this reference.
Please click here for ADS abstract

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