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Multi-Zone Warm and Cold Clumpy Absorbers in Three Seyfert Galaxies

Published online by Cambridge University Press:  03 June 2010

Claudio Ricci ,
Volker Beckmann ,
Marc Audard  and
T. J.-L. Courvoisier
Claudio Ricci
Affiliation:
ISDC Data Centre for Astrophysics, University of Geneva, ch. d'Ecogia 16, 1290 Versoix, Switzerland Email: claudio.ricci@unige.ch Geneva Observatory, University of Geneva, ch. des Maillettes 51, 1290 Sauverny, Switzerland
Volker Beckmann
Affiliation:
APC, Centre François Arago, Université Paris Diderot, CNRS/IN2P3, 10 rue A. Domon et L. Duquet, 75205 Paris Cedex, France
Marc Audard
Affiliation:
ISDC Data Centre for Astrophysics, University of Geneva, ch. d'Ecogia 16, 1290 Versoix, Switzerland Email: claudio.ricci@unige.ch Geneva Observatory, University of Geneva, ch. des Maillettes 51, 1290 Sauverny, Switzerland
T. J.-L. Courvoisier
Affiliation:
ISDC Data Centre for Astrophysics, University of Geneva, ch. d'Ecogia 16, 1290 Versoix, Switzerland Email: claudio.ricci@unige.ch Geneva Observatory, University of Geneva, ch. des Maillettes 51, 1290 Sauverny, Switzerland
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A soft (E≲2 keV) excess over the power-law component dominant at higher energies has been found in the X-ray spectra of many Seyfert galaxies. The origin of the soft excess is still an open issue. In the past it was often associated with the high-energy tail of the thermal emission of the accretion disk, but it has been shown recently that the temperature of the disk should be constant (0.1–0.2 keV), regardless of the mass and luminosity of the AGN (Gierlinski & Done 2004). This result implies that some other mechanism is at work, as the temperature of the disk should depend on both the mass of the black hole and the accretion rate.

Keywords

galaxies: individual (ESO 383-18, ESO 140-43, UGC 3142)X-rays: galaxiesX-rays: individual (ESO 383-18, ESO 140-43, UGC 3142)galaxies: active
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Symposium S267: Co-Evolution of Central Black Holes and Galaxies , August 2009 , pp. 404
Copyright
Copyright © International Astronomical Union 2010

References

Gierlinski, M. & Done, C. 2004, MNRAS, 349, L7CrossRefGoogle Scholar