The first INTEGRAL AGN catalog

被引：84

作者：

Beckmann, V

Gehrels, N

Shrader, CR

Soldi, S

机构：

[1] NASA, Goddard Space Flight Ctr, Explorat Universe Div, Greenbelt, MD 20771 USA

[2] INTEGRAL Sci Data Ctr, CH-1290 Versoix, Switzerland

[3] Univ Maryland Baltimore Cty, Joint Ctr Astrophys, Dept Phys, Baltimore, MD 21250 USA

[4] Univ Space Res Assoc, Columbia, MD 21044 USA

[5] Observ Geneva, CH-1290 Sauverny, Switzerland

来源：

ASTROPHYSICAL JOURNAL | 2006年 / 638卷 / 02期

关键词：

catalogs; galaxies : active; galaxies : Seyfert; gamma rays : observations; X-rays : galaxies;

D O I：

10.1086/499034

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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).

引用

页码：642 / 652

页数：11

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