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Analyzing short-term X-ray variability of Cygnus X-1 with Linear State Space Models by Pottschmidt, K.; Koenig, M.; Wilms, J.; Staubert, R. is a scholarly article available to read on EtoBox.

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Cyg X-1 exhibits irregular X-ray variability on all measured timescales. The usually applied shot noise models describe the typical short-term behavior of this source by superposition of randomly occuring shots with a distribution of shot durations. We have reanalyzed EXOSAT ME observations of Cyg X-1 using the more general Linear State Space Models (LSSMs). These models, which explicitly take the observation-noise into account, model the intrinsic system variability with an autoregressive (AR) process. Our fits show that an AR process of first order can reproduce the system variability of Cyg X-1. A possible interpretation is again the superposition of individual shots, but with a single relaxation timescale tau. This parameter was found to be 0.19s.

Author

Pottschmidt, K.; Koenig, M.; Wilms, J.; Staubert, R.

Published

1998

Language

EN