Physics
Scientific paper
Nov 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002xrb..confe..54z&link_type=abstract
X-ray Binaries in the Chandra and XMM-Newton Era (with an emphasis on Targets of Opportunity), Abstracts of the conference held
Physics
Actively Accreting And Transient Binaries
Scientific paper
I present results of studies of the variability patterns of black-hole binaries on long time scales (>1 day). The variability of Cyg X-1 in the hard state consists mostly of pivoting with the pivot energy near 50 keV. In the soft state, its variability is of a high-energy tail on top of a constant blackbody. These patterns (as given directly by spectral variability as well as by rms as function of energy) can be theoretically interpretated as caused by variations of the flux of seed soft photons incident on the hot plasma with a near-constant luminosity in the hard state, and by variations of the luminosity of a hot plasma irradiated by near-constant blackbody photons in the soft state. The two geometries corresponding to the two patterns are an overlapping hot and cold accretion flows, and nonthermal flares on top of a stable thin disk, respectively. Notably, the overall power spectrum of Cyg X-1 has most power at those long time scales. I also discuss the relationship to short time scale variability in Cyg X-1, as well as the case of GX 339-4.
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