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arXiv:astro-ph/0504403 (astro-ph)
[Submitted on 18 Apr 2005]

Title:INTEGRAL & RXTE Power Spectra of Cygnus X-1

Authors:K. Pottschmidt (1,2), J. Wilms (3), M.A. Nowak (4), S. Larsson (5), A.A. Zdziarski (6), G.G. Pooley (7) ((1) MPE, (2) ISDC, (3) University of Warwick, (4) MIT-CXC, (5) Stockholm Observatory, (6) Copernicus Center, (7) Cavendish Laboratory)
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Abstract: We evaluate 0.03-20 Hz power spectra of the bright black hole binary Cyg X-1 obtained from non-deconvolved INTEGRAL-ISGRI event data. The ISGRI power spectra are compared to contemporary RXTE-PCA ones in the same hard X-ray energy band of 15-70 keV. They agree well in shape. Since the ISGRI power spectrum of Cyg X-1 is not background corrected it lies about an order of magnitude below the PCA values. In 2003 a soft outburst of Cyg X-1 occurred.
From the RXTE-ASM and Ryle radio long term lightcurves and the RXTE spectra we see a canonical ``hard state -- intermediate state -- soft state'' evolution. We discuss the evolution of the power spectra in the 15-70 keV range which so far is much less well studied than that at softer energies. We interpret our results regarding the origin of certain variability components.
Comments: 7 pages, 4 figures, to appear in Proc. 35rd Cospar Scientific Assembly, accepted by Advances in Space Research
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:astro-ph/0504403
  (or arXiv:astro-ph/0504403v1 for this version)
  https://doi.org/10.48550/arXiv.astro-ph/0504403
Related DOI: https://doi.org/10.1016/j.asr.2005.04.032

Submission history

From: Katja Pottschmidt [view email]
[v1] Mon, 18 Apr 2005 23:01:44 UTC (65 KB)
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