出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：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 90min 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.
