Institut für Astronomie und Astrophysik
Abteilung AstronomieSand 1, D-72076 Tübingen, Germany
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T. Gleissner (1), J. Wilms (1 and 2), G. G. Pooley (3), M. A. Nowak (4), K. Pottschmidt (5 and 6), S. Markoff (4), S. Heinz (4), M. Klein-Wolt (7), R. P. Fender (7), R. Staubert (1)
(1) Univ. Tübingen
(2) Univ. Warwick
(7) Univ. Amsterdam
To be published in: A&A
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 the 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.
Key words: black hole physics -- stars: individual: Cyg X-1 -- stars: individual: GRS~1915+105 -- X-rays: binaries -- X-rays: general
Preprint (160 kb PDF file including figures)
Astrophysics (astro-ph): astro-ph/0407070
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Last modified 30 Jan 2013