Rapid X-Ray Variability of Seyfert 1 Galaxies |
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| Authors: | S Vaughan A C Fabian K Iwasawa |
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| Institution: | (1) X-Ray and Observational Astronomy Group, University of Leicester, Leicester, U.K.;(2) Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge, U.K. |
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| Abstract: | The rapid and seemingly random fluctuations in X-ray luminosity of Seyfert galaxies provided early support for the standard
model in which Seyferts are powered by a supermassive black hole fed from an accretion disc. However, since EXOSAT there has been little opportunity to advance our understanding of the most rapid X-ray variability. Observations with XMM-Newton have changed this.
We discuss some recent results obtained from XMM-Newton observations of Seyfert 1 galaxies. Particular attention will be given to the remarkable similarity found between the timing
properties of Seyferts and black hole X-ray binaries, including the power spectrum and the cross spectrum (time delays and
coherence), and their implications for the physical processes at work in Seyferts. |
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| Keywords: | X-rays variability active galaxies |
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