Analyzing short-term X-ray variability of Cygnus X-1 with Linear State Space Models

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dc.creatorPottschmidt, K.
dc.creatorKoenig, M.
dc.creatorWilms, J.
dc.creatorStaubert, R.
dc.date1998-02-26
dc.date.accessioned2026-07-07T02:26:13Z
dc.date.available2026-07-07T02:26:13Z
dc.descriptionCyg 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.
dc.description9 pages, 7 figures, accepted for publication in Astronomy & Astrophysics, also available at http://astro.uni-tuebingen.de/publications/
dc.identifierhttps://arxiv.org/abs/astro-ph/9802339
dc.identifierhttp://arxiv.org/abs/astro-ph/9802339
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/12182
dc.subjectAstrophysics
dc.titleAnalyzing short-term X-ray variability of Cygnus X-1 with Linear State Space Models
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