Correlated Radio-X-Ray Variability of Galactic Black Holes: A Radio-X-Ray Flare in Cygnus X-1

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https://iopscience.iop.org/article/10.1086/520508

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https://doi.org/10.1086/520508
 http://hdl.handle.net/11603/30001

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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

2007-06-22

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journal articles
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Citation of Original Publication

Wilms, Jörn, Katja Pottschmidt, Guy G. Pooley, Sera Markoff, Michael A. Nowak, Ingo Kreykenbohm, and Richard E. Rothschild. “Correlated Radio-X-Ray Variability of Galactic Black Holes: A Radio-X-Ray Flare in Cygnus X-1.” The Astrophysical Journal 663, no. 2 (June 22, 2007): L97. https://doi.org/10.1086/520508.

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Abstract

We report on the first detection of a quasi-simultaneous radio-X-ray flare of Cygnus X-1. The detection was made on 2005 April 16 with pointed observations by the RXTE and the Ryle telescope, during a phase where the black hole candidate was close to a transition from its soft state to its hard state. The radio flare lagged the X-rays by ~7 minutes, peaking at 3:20 hr barycentric time (TDB 2,453,476.63864). We discuss this lag in the context of models explaining such flaring events as the ejection of electron bubbles emitting synchrotron radiation.