K. Pottschmidt(1), J. Wilms(1), M.A. Nowak(2), J.B. Dove(3), M.C. Begelman(2), R. Staubert(1)
(1)Institut für Astronomie und Astrophysik, Astronomie, Universität
Tübingen, Waldhäuser Str. 64, D-72076 Tübingen, Germany
(2)JILA, University of Colorado, Boulder, CO 80309-440, U.S.A.
(3)CASA, University of Colorado, Boulder, CO 80309-389, U.S.A.
1999, Highlights in X-ray Astronomy, ed. B. Aschenbach, MPE Report, in press
Abstract. We present results from a 20 ksec RXTE observation of the black hole candidate Cyg X-1. We apply self-consistent accretion disk corona models to these hard state data and show that Comptonization in a spherical corona irradiated by soft photons from an exterior cold disk is able to successfully model the spectrum. We also present the power spectrum, the coherence function, and the time lags for lightcurves from four energy bands. By modeling the high-resolution lightcurves with stochastic linear state space models, we show that the rapid hard state variability of Cyg X-1 can be explained with a single timescale.
Key words: -
Paper (73k gzip'ed Postscript including figures)
[Home Page] [Preprints 1998] [Quick Reference] [Feedback]
Jürgen Barnstedt (barnstedt AT astro.uni-tuebingen.de)
Last updated 16-Nov-1998