The Origin of the Soft Excess in High L/L_<Edd> AGN(Chapter 10. Super Massive Black Holes, The Extreme Universe in the Suzaku Era)
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概要
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We discuss the origin of the soft X-ray excess seen in AGN. There are clear advantages to models where this arises from atomic processes in partially ionised material rather than where it is a true continuum component. However, current data cannot distinguish between models where this material is seen in reflection or absorption, even for the archetypal 'reflection dominated' AGN MCG-6-30-15. Instead, we give physical arguments on the ionization structure of X-ray illuminated material which exclude a reflection origin if the disc is in hydrostatic equilibrium. The same physical processes strongly favour an absorption origin for the soft excess, giving a more messy picture of the accretion environment. This implies that these apparently 'reflection dominated' AGN are not good places to test GR, but they do give insight into the spectra expected from the first QSO's in the early Universe.
- 2007-12-19
著者
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Done Chris
Department Of Physics Durham University
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DONE Chris
Department of Physics, University of Durham
関連論文
- Suzaku Results on Cygnus X-1 in the Low/Hard State
- Suzaku Wide-Band X-Ray Spectroscopy of the Seyfert 2 AGN in NGC 4945
- Suzaku Discovery of Absorption Lines from the Black Hole Transient 4U1630-472(Chapter 9. Stellar/Intermediate Mass Black Holes, The Extreme Universe in the Suzaku Era)
- Suzaku observation of two ultraluminous X-ray sources in NGC 1313
- Suzaku Discovery of Iron Absorption Lines in Outburst Spectra of the X-Ray Transient 4U 1630-472
- Understanding of X-Ray Spectra of Black Hole Binaries and Its Application to ULXs(Session 1 : Galactic BH Binaries)
- Spectral Study of GX 339-4 in the Low-Intensity State Observed with Ginga
- Spectral Transitions in X-Ray Binaries(Session 1 : Galactic BH Binaries)
- The Origin of the Soft Excess in High L/L_ AGN(Chapter 10. Super Massive Black Holes, The Extreme Universe in the Suzaku Era)
- Accurate Modelling of Relativistic Iron Lines from Accretion Discs(Session 8 : Key Physical Evidence for BHs)
- Spectral and Timing Studies of Cyg X-1 in the Low/Hard State with Suzaku
- Understanding of X-Ray Spectra of Black Hole Binaries and Its Application to ULXs(Session 1 : Galactic BH Binaries)
- Spectral Transitions in X-Ray Binaries(Session 1 : Galactic BH Binaries)
- Accurate Modelling of Relativistic Iron Lines from Accretion Discs(Session 8 : Key Physical Evidence for BHs)