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Strong gravity effects: X-ray spectra, variability and polarimetry

Published online by Cambridge University Press:  01 August 2006

Andrew C. Fabian
Andrew C. Fabian*
Affiliation:
Institute of Astronomy, Madingley Road, Cambridge CB3 0HA, UK email: acf@ast.cam.ac.uk
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Abstract

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Accreting black holes often show iron line emission in their X-ray spectra. When this line emission is very broad or variable then it is likely to originate from close to the black hole. The theory and observations of such broad and variable iron lines are briefly reviewed here. In order for a clear broad line to be found, one or more of the following have to occur: high iron abundance, dense disk surface and minimal complex absorption.

Several excellent examples are found from observations of Seyfert galaxies and Galactic Black Holes. In some cases there is strong evidence that the black hole is rapidly spinning. Further examples are expected as more long observations are made with XMM-Newton, Chandra and Suzaku. The X-ray spectra show evidence for the strong gravitational redshifts and light bending expected around black holes.

Keywords

Black hole physics – X-rays – line: formation – accretionaccretion disks
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S238: Black Holes from Stars to Galaxies – Across the Range of Masses , August 2006 , pp. 129 - 138
Copyright
Copyright © International Astronomical Union 2007

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