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Preprint 11d/97

RXTE Observation of Cygnus X-1: Spectra and Timing

J. Wilms(1), J. Dove(2), M. Nowak(2), B.A. Vaughan(3)

(1)Institut für Astronomie und Astrophysik, Astronomie, Universität Tübingen, Waldhäuser Str. 64, D-72076 Tübingen, Germany
(2)JILA, University of Colorado, Campus Box 440, Boulder, CO 80309-0440
(3)Space Radiation Laboratory, Caltech, Pasadena, CA 91125

Contribution to the 4th COMPTON Symposium on Gamma Ray Astronomy and Astrophysics, Williamsburg, Virginia, USA, April 27-30, 1997

Abstract. We present preliminary results from the analysis of an RXTE observation of Cygnus X-1 in the hard state. We show that the observed X-ray spectrum can be explained with a model for an accretion disk corona, in which a hot sphere is situated inside of a cold accretion disk. Accretion disk corona models with a slab-geometry do not successfully fit the data. We also present the observed temporal properties of Cyg X-1, i.e. the coherence-function and the time-lags, and discuss the constraints these temporal properties impose for the modeled accretion geometry in Cyg X-1.

Paper (69k gzip'ed Postscript including figures)

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Jürgen Barnstedt (barnstedt AT astro.uni-tuebingen.de)
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