Temporal Evolution of X-ray Lags in Cygnus X-1

K. Pottschmidt, J. Wilms, M. A. Nowak +3

We present the long term evolution of the frequency-dependent X-ray time lags of the black hole candidate Cygnus X-1 as measured in 1996 and 1998 with the Rossi X-ray Timing Explor…