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Short-Term Radio-X-Ray Correlations of Cygnus X-1

  • T. Gleissner (a1), J. Wihns (a1), G. G. Pooley (a2), M. A. Nowak (a3), K. Pottschmidt (a4) (a5), S. Markoff (a3), M. Klein-Wolt (a6), R. P. Fender (a6) and R. Staubert (a1)...

Extract

We analyze simultaneous radio-X-ray data of Cygnus X-l from the Ryle telescope (RT) and RXTE over more than 4 a. We show that apparent correlations on short time scales in the lightcurves of Cyg X-l are probably the coincidental outcome of white noise statistics.

As a measure of correlation between radio and X-ray emission, we calculate the maximum cross-correlation coefficient, ccf, of simultaneous radio and X-ray lightcurves, which are rebinned to a resolution of 32 s and smoothed. Every single X-ray lightcurve segment is cross-correlated with the corresponding radio lightcurve, up to a maximum shift Δt = ±10 h.

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References

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Gleissner, T., Wilms, J., Pooley, G. G., et al. 2004, A&A, to be submitted
Klein-Wolt, M., Fender, R. P., Pooley, G. G., et al. 2002, MNRAS, 331, 745
Mirabel, I. F., Dhawan, V., Chaty, S., et al. 1998, A&A, 330, L9
Pooley, G. G., Fender, R. P., & Brocksopp, С. 1999, MNRAS, 302, L1

Short-Term Radio-X-Ray Correlations of Cygnus X-1

  • T. Gleissner (a1), J. Wihns (a1), G. G. Pooley (a2), M. A. Nowak (a3), K. Pottschmidt (a4) (a5), S. Markoff (a3), M. Klein-Wolt (a6), R. P. Fender (a6) and R. Staubert (a1)...

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