High-Frequency X-Ray Oscillations and X-Ray Spectral Evolution in Galactic Black Hole Binaries

Details High-Frequency X-Ray Oscillations and X-Ray Spectral Evolution in Galactic Black Hole Binaries High-Frequency X-Ray Oscillations and X-Ray Spectral Evolution in Galactic Black Hole Binaries

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002nmgm.meet.2220r&link_type=abstract

"THE NINTH MARCEL GROSSMANN MEETING On Recent Developments in Theoretical and Experimental General Relativity, Gravitation and R

Physics

Scientific paper

There are now 5 Galactic black hole candidates that have exhibited quasi-periodic oscillations (QPO) in X-rays in the range of 67 to 300 Hz. The rms amplitudes are near 1 % of the average flux, and in two cases there are significant changes in the QPO frequency. The short timescales and origin in X-rays suggest that these QPOs signify inner accretion disk oscillations rooted in General Relativity, but the particular mechanism is uncertain. For two of these cases, GRO J1655-40 and GRS 1915+105, we trace the conditions under which these QPOs appear in terms of the division of luminosity between the X-ray components due to the accretion disk and the hard X-ray power law. In this context, the fast QPOs are most likely to occur when there is high luminosity in both the disk and the X-ray power-law component. On the other hand, the QPOs are not seen when the X-ray spectrum resembles either a pure disk or a dominant power-law component associated with a radio jet. The results imply a closer kinship for these QPOs than might be concluded from considerations of the gross shape of the X-ray spectrum.

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