Long term variability of Cygnus X-1. III. Radio–X-ray correlations

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https://www.aanda.org/articles/aa/abs/2004/39/aa0280-04/aa0280-04.html

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https://doi.org/10.1051/0004-6361:20040280
 http://hdl.handle.net/11603/30126

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UMBC Center for Space Sciences and Technology (CSST) / Center for Research and Exploration in Space Sciences & Technology II (CRSST II)
UMBC Physics Department

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https://orcid.org/0000-0002-4656-6881

Date

2004-09-28

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journal articles
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Gleissner, T., J. Wilms, G. G. Pooley, M. A. Nowak, K. Pottschmidt, S. Markoff, S. Heinz, M. Klein-Wolt, R. P. Fender, and R. Staubert. “Long Term Variability of Cygnus X-1 - III. Radio–X-Ray Correlations.” Astronomy & Astrophysics 425, no. 3 (October 1, 2004): 1061–68. https://doi.org/10.1051/0004-6361:20040280.

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Abstract

Long time scale radio–X-ray correlations in black holes during the hard state have been found in many sources and there seems to emerge a universal underlying relationship which quantitatively describes this behavior. Although it would appear only natural to detect short term emission patterns in the X-ray and – with a certain time lag – in the radio, there has been little evidence for this up to now. The most prominent source for radio–X-ray correlations on short time scales (minutes) so far remains GRS 1915+105 where a single mass ejection could be detected successively in X-ray, IR, and radio wavebands. We analyze a database of more than 4 years of simultaneous radio–X-ray data for Cygnus X-1 from the Ryle Telescope and RXTE PCA/HEXTE. We confirm the existence of a radio–X-ray correlation on long time scales, especially at hard energies. We show that apparent correlations on short time scales in the lightcurves of Cygnus X-1 are most likely the coincidental outcome of white noise statistics. Interpreting this result as a breakdown of radio–X-ray correlations on shorter time scales, this sets a limit to the speed of the jet.