X-ray timing of Active Galaxies

Details X-ray timing of Active Galaxies X-ray timing of Active Galaxies

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006head....9.1004v&link_type=abstract

American Astronomical Society, HEAD meeting #9, #10.04; Bulletin of the American Astronomical Society, Vol. 38, p.364

Mathematics

Logic

Scientific paper

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, in the years following EXOSAT there was little opportunity to advance our understanding of the most rapid X-ray variability. Observations with XMM-Newton have changed this.
We discuss the impact of XMM-Newton timing results on our understanding of Seyfert galaxies. Particular attention will be given to the remarkable similarity found been the timing properties of Seyferts and black hole X-ray binaries, including the power spectrum, cross spectrum (time delays and coherence), and the ubiquitous rms-flux relation. These results strong support the hypothesis of 'Black Hole Unification': If strong gravity dominates the dynamics of the inner accretion flow around black holes then scale invariance implies accretion onto super-massive black holes AGN should be fundamentally the same as for stellar mass black holes in Galactic Black Hole (GBH) X-ray binaries, with the dynamical frequencies scaling inversely with the black hole mass. We will also discuss why current AGN data have not shown strong evidence for quasi-periodic oscillations (QPOs), despite their presence in GBHs, and detail the technological and methodological problems in this search.

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