Catching Up on State Transitions in Cygnus X-1

Details Catching Up on State Transitions in Cygnus X-1 Catching Up on State Transitions in Cygnus X-1

2008-11-14

arxiv.org/abs/0811.2357v1

PoS MQW7:089,2008

Astronomy and Astrophysics

Astrophysics

5 pages, contributed poster at the 7th Microquasar Workshop, Foca, Turkey, Sept. 1-5, 2008

Scientific paper

In 2005 February we observed Cygnus X-1 over a period of 10 days quasi-continuously with the Rossi X-ray Timing Explorer and the Ryle telescope. We present the results of the spectral and timing analysis on a timescale of 90 min and show that the behavior of Cyg X-1 is similar to that found during our years long monitoring campaign. As a highlight we present evidence for a full transition from the hard to the soft state that happened during less than three hours. The observation provided a more complete picture of a state transition than before, especially concerning the evolution of the time lags, due to unique transition coverage and analysis with high time resolution.

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