155 articles – 1965 Notices  [english version]
HAL : hal-00656060, version 1

Fiche détaillée  Récupérer au format
X-ray Astronomy 2009, Bologna : Italie (2009)
The unified scheme seen with INTEGRAL detected AGN
V. Beckmann1, S. Soldi2, C. Ricci, T. J.-L. Courvoisier, J. Alfonso-Garzón, A. Domingo, J. M. Mas-Hesse, P. Lubiński, A. A. Zdziarski, N. Gehrels3
(07/2010)

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 type 2 AGN. When applying a Compton reflection model, the underlying continua (Γ~=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. More luminous objects appear to be more massive and there is also a general trend for the absorbed sources and type 2 AGN to have lower Eddington ratios. The number counts are consistent with no evolution of the observed AGN. 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.
1 :  APC - UMR 7164 - AstroParticule et Cosmologie
2 :  IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers (ex DAPNIA)
3 :  NASA Goddard Space Flight Center - NASA Goddard Space Flight Center
APC - AHE
Physique/Astrophysique/Phénomènes cosmiques de haute energie

Planète et Univers/Astrophysique/Phénomènes cosmiques de haute energie
galactic nuclei – Seyfert galaxies – brightness – X-ray spectra – black holes – Galactic nuclei – circumnuclear matter – and bulges – Quasars – active or peculiar galaxies – objects – and systems – Magnitudes and colors – luminosities – X-ray – Black holes