Quasi-periodic variability and the inner radii of thin accretion disks in galactic black-hole systems

Details Quasi-periodic variability and the inner radii of thin accretion disks in galactic black-hole systems Quasi-periodic variability and the inner radii of thin accretion disks in galactic black-hole systems

1999-10-06

arxiv.org/abs/astro-ph/9910120v1

Astronomy and Astrophysics

Astrophysics

emulateapj.sty, color figure, to appear in ApJ Letters

Scientific paper

10.1086/312369

We calculate upper bounds on the inner radii of geometrically thin accretion disks in galactic black-hole systems by relating their rapid variability properties to those of neutron stars. We infer that the inner disk radii do not exhibit large excursions between different spectral states, in contrast with the concept that the disk retreats significantly during the soft-to-hard state transition. We find that, in the hard state, the accretion disks extend down to radii less than 6-25 GM/c^2 and discuss the implications of our results for models of black-hole X-ray spectra.

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