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Zoekopdracht: journal id: "astronomyxandxastrophysics"

AuteursT. Gleissner, J. Wilms, G.G. Pooley, M.A. Nowak, K. Pottschmidt, S. Markoff, S. Heinz, M. Klein Wolt, R.P. Fender, R. Staubert
TitelLong term variability of Cygnus X-1. III. Radio-X-ray correlations
TijdschriftAstronomy and Astrophysics
Jaargang425
Jaar2004
Pagina's1061-1068
ISSN00046361
FaculteitFaculteit der Natuurwetenschappen, Wiskunde en Informatica
Instituut/afd.FNWI: Astronomical Institute Anton Pannekoek (IAP)
Trefwoordenblack hole physics; stars: individual: Cyg X-1; stars: individual: GRS 1915+105; X-rays: binaries; X-rays: general
SamenvattingLong 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.
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