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arXiv:astro-ph/9612238 (astro-ph)
[Submitted on 29 Dec 1996]

Title:Analyzing X-ray variability by Linear State Space Models

Authors:Michael Koenig (1), Jens Timmer (2) ((1) Institute for Astronomy and Astrophysics, Dep. Astronomy, University of Tuebingen, Germany (2) Physics Department, University of Freiburg, Germany)
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Abstract: In recent years, autoregressive models have had a profound impact on the description of astronomical time series as the observation of a stochastic process. These methods have advantages compared with common Fourier techniques concerning their inherent stationarity and physical background. However, if autoregressive models are used, it has to be taken into account that real data always contain observational noise often obscuring the intrinsic time series of the object. We apply the technique of a Linear State Space Model which explicitly models the noise of astronomical data and allows to estimate the hidden autoregressive process. As an example, we have analysed the X-ray flux variability of the Active Galaxy NGC 5506 observed with EXOSAT.
Comments: 8 pages, Latex, 4 PostScript figures, to be published in Astron. and Astrophys. Suppl
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:astro-ph/9612238
  (or arXiv:astro-ph/9612238v1 for this version)
  https://doi.org/10.48550/arXiv.astro-ph/9612238
Related DOI: https://doi.org/10.1051/aas%3A1997104

Submission history

From: Michael Koenig [view email]
[v1] Sun, 29 Dec 1996 18:51:55 UTC (213 KB)
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