Astronomy and Astrophysics – Astrophysics – High Energy Astrophysical Phenomena
Scientific paper
2010-01-25
Astronomy and Astrophysics
Astrophysics
High Energy Astrophysical Phenomena
6 pages. Accepted for publication on PoS (contribution PoS(extremesky2009)038), proceedings of "The Extreme sky: Sampling the
Scientific paper
The INTEGRAL mission provides a large data set for studying the hard X-ray properties of AGN and allows to test the unified scheme for AGN. We present results based on the analysis of 199 AGN. A difference between the Seyfert types is detected in slightly flatter spectra with higher cut-off energies and lower luminosities for the more absorbed/type 2 AGN. When applying a Compton reflection model, the underlying continua (photon index 1.95) appear the same in Seyfert 1 and 2, and the reflection strength is R=1 in both cases, with differences in the inclination angle only. A difference is seen in the sense that Seyfert 1 are on average twice as luminous in hard X-rays than the Seyfert 2 galaxies. The unified model for Seyfert galaxies seems to hold, showing in hard X-rays that the central engine is the same in Seyfert 1 and 2 galaxies, seen under different inclination angle and absorption. Based on our knowledge of AGN from INTEGRAL data, we briefly outline open questions and investigations to answer them. In this context an ultra-deep (>= 12 Ms) extragalactic field can be a true legacy of the INTEGRAL mission in the area of AGN studies.
Alfonso-Garzon Julia
Beckmann Volker
Courvoisier Thierry J. -L.
Domingo Albert
Gehrels Neil
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