Correlated radio--X-ray variability of Galactic Black Holes: A radio--X-ray flare in Cygnus X-1

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 Rossi X-ray Timing Explorer and the Ryle telescope, during a phase where the black hole candidate was close to a transition from the its soft into its hard state. The radio flare lagged the X-rays by approximately 7 minutes, peaking at 3:20 hours barycentric time (TDB 2453476.63864). We discuss this lag in the context of models explaining such flaring events as the ejection of electron bubbles emitting synchrotron radiation.

4 pages, 4 figures

References in corpus (3)

• Opening angles, Lorentz factors and confinement of X-ray binary jets
• A transient relativistic radio jet from Cygnus X-1
• Hard X-ray emission of the Earth's atmosphere: Monte Carlo simulations

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• Long term variability of Cygnus X-1. VIII. A spectral-timing look at low energies with NICER
• Formation of episodic jets and associated flares from black hole accretion systems
• High hard X-ray polarization in Cygnus X-1 confined to the intermediate hard state: evidence for a variable jet component
• Unprecedentedly bright X-ray flaring in Cygnus X-1 observed by INTEGRAL
• Catching Up on State Transitions in Cygnus X-1