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

Published online by Cambridge University Press:  22 February 2018

T. Gleissner ,
J. Wihns ,
G. G. Pooley ,
M. A. Nowak ,
K. Pottschmidt ,
S. Markoff ,
M. Klein-Wolt ,
R. P. Fender  and
R. Staubert
T. Gleissner
Affiliation:
IAA Tübingen, Sand 1, 72076 Tübingen, Germany
J. Wihns
Affiliation:
IAA Tübingen, Sand 1, 72076 Tübingen, Germany
G. G. Pooley
Affiliation:
Astrophysics. Cavendish Laboratory, Cambridge, UK
M. A. Nowak
Affiliation:
MIT, Center for Space Research, CambridgeUSA
K. Pottschmidt
Affiliation:
MРE, Garching, Germany INTEGRAL Science Data Centre, Versoix, Switzerland
S. Markoff
Affiliation:
MIT, Center for Space Research, CambridgeUSA
M. Klein-Wolt
Affiliation:
University of Amsterdam, Amsterdam, the Netherlands
R. P. Fender
Affiliation:
University of Amsterdam, Amsterdam, the Netherlands
R. Staubert
Affiliation:
IAA Tübingen, Sand 1, 72076 Tübingen, Germany

Extract

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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.

Type
The Contributed Papers
Information
International Astronomical Union Colloquium , Volume 194: Compact binaries in the galaxy and beyond , 2004 , pp. 202
Copyright
Copyright © Instituto de astronomia/revista mexicana de astronomίa y astrofίsica 2004

References

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