The Inner Accretion Disk of the Black Hole Binary Transient XTE J1650-500

Details The Inner Accretion Disk of the Black Hole Binary Transient XTE J1650-500 The Inner Accretion Disk of the Black Hole Binary Transient XTE J1650-500

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21540406s&link_type=abstract

American Astronomical Society, AAS Meeting #215, #404.06; Bulletin of the American Astronomical Society, Vol. 42, p.225

Astronomy and Astrophysics

Astronomy

Scientific paper

The inner accretion disk geometry of black hole binaries (BHBs) in transition between the low/hard and high/soft states is important for understanding accretion flow around black holes. In the low/hard state a discrepancy exists over whether the cool, optically thick accretion disk extends close to the innermost stable circular orbit (ISCO) or is truncated out to hundreds of gravitational radii. XTE J1650-500 was observed during a transition from the low/hard to the high/soft spectral state by the Rossi X-ray Timing Explorer. The recession of the accretion disk in BHBs has previously been claimed due to shifts in low frequency quasi-periodic oscillations (QPOs) during outburst. Here we show that a thermal disk component is required over much of the transition with a color temperature that closely follows the LX T4 relation. Furthermore, we show that for an inner disk radius that remains close to the ISCO, the observed evolution in the disk spectrum can be explained by a changing spectral hardening factor (fcol) incorporated into the disk component, although this result strongly depends on the physically conceivable range of fcol. We conclude that variations in fcol may contribute to the observed changes in accretion disk spectra and must be fully considered before claiming the disappearance of the inner disk region in the low/hard state.

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