Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-12-17
Astronomy and Astrophysics
Astrophysics
X-Ray Timing 2003: Rossi and Beyond (CfA, 2003), Eds. P.Kaaret, F.K.Lamb, & J.H.Swank
Scientific paper
10.1063/1.1781006
RXTE/PCA observations of several black hole X-ray binaries in the low spectral state revealed a tight correlation between spectral parameters and characteristic frequencies of variability of X-ray flux. In particular, the amplitude of reflection increases and the slope of Comptonized radiation steepens as the noise frequencies increase. The data also suggest that there is a correlated increase of the width of the Fe fluorescent line, probably related to the Doppler broadening of the reflection features. Moreover, the width of the line seems to follow DeltaE/E ~ nu_qpo^{1/3} law. If confirmed with higher energy resolution observations, this result will have significant impact on the models of the accretion flow and on our understanding of the nature of characteristic frequencies of variability in X-ray binaries. In particular, it will lend support to the truncated disk picture, confirming that the spectral variations are indeed related to changes of the position of the inner disk boundary and that characteristic variability frequencies are proportional to the Keplerian frequency at the inner boundary of the accretion disk.
Churazov Eugene
Gilfanov Marat
Revnivtsev Mike
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