Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aas...212.1508f&link_type=abstract
American Astronomical Society, AAS Meeting #212, #15.08; Bulletin of the American Astronomical Society, Vol. 40, p.531
Astronomy and Astrophysics
Astronomy
Scientific paper
We discuss our studies of quasi-periodic oscillations (QPOs) originating from random X-ray flashes around a fast-rotating black hole in Kerr geometry. X-ray sources are assumed to be located around the innermost stable circular orbit (ISCO). In this model, by allowing realistic three-dimensional photon orbits for arbitrary positions of a distant observer and X-ray sources, we calculate synthetic light curves to show the power spectral density and corresponding autocorrelation functions. In the case of an optically-thin environment presumably relevant for advection-dominated regime we find a persistent QPO at 14 mHz for a 10^6 solar-mass black hole for a wide range of viewing angle ( 30 to 80 deg) if the random X-ray sources are collectively situated within the ergosphere (its frequency is inversely proportional to black hole mass). In this model QPO signal is produced by strong frame-dragging of rapidly-rotating black hole, which is a direct consequence of relativistic photon orbits. We also consider emission relevant for an optically-thick environment (around an accretion disk) and show that a similar QPO signal can be expected for a nearly edge-on observer. Our model predicts for various source/observer configurations a robust presence of QPO, which is inherently generic to curved spacetime structure in black hole systems.
Fukumura Keigo
Kazanas Demos
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