Properties of a fast state transition in Cygnus X-1

Details Properties of a fast state transition in Cygnus X-1 Properties of a fast state transition in Cygnus X-1

Jul 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aipc.1248..143b&link_type=abstract

X-RAY ASTRONOMY 2009; PRESENT STATUS, MULTI-WAVELENGTH APPROACH AND FUTURE PERSPECTIVES: Proceedings of the International Confer

Astronomy and Astrophysics

Astronomy

2

X-Ray Binary Stars, Astronomical Telescopes, X-Ray Spectra, Light Coherence, X-Ray Binaries, Space-Based Ultraviolet, Optical, And Infrared Telescopes, X-Ray, Coherence

Scientific paper

In 2005 February we observed the microquasar Cygnus X-1 for a total of 10 days quasi-continuously with the Rossi X-ray Timing Explorer and the Ryle telescope. During that period of time Cyg X-1 was very variable and covered a large fraction of its total variability found during our years long monitoring. A full transition from the hard to the soft state occured within less than 2.5 hours. We present results of the spectral and timing analysis, compare them with the long-term behavior and discuss the discovered energy dependence of the power spectra.

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