Temporal and Spectral Correlations of Cyg X-1

Details Temporal and Spectral Correlations of Cyg X-1 Temporal and Spectral Correlations of Cyg X-1

1999-03-15

arxiv.org/abs/astro-ph/9903218v2

Astronomy and Astrophysics

Astrophysics

17 pages, 6 figures included, to appear in ApJ

Scientific paper

10.1086/307566

Temporal and spectral properties of X-ray rapid variability of Cyg X-1 are studied by an approach of correlation analysis in the time domain on different time scales. The correlation coefficients between the total intensity in 2-60 keV and the hardness ratio of 13-60 keV to 2-6 keV band on the time scale of about 1 ms are always negative in all states. For soft states, the correlation coefficients are positive on all the time scales from about 0.01 s to 100 s, which is significantly different with that for transition and low states. Temporal structures in high energy band are narrower than that in low energy band in quite a few cases. The delay of high energy photons relative to low energy ones in the X-ray variations has also been revealed by the correlation analysis. The implication of observed temporal and spectral characteristics to the production region and mechanism of Cyg X-1 X-ray variations is discussed.

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