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INTEGRAL & RXTE Power Spectra of Cygnus X-1 | | K. Pottschmidt
; J. Wilms
; M.A. Nowak
; S. Larsson
; A.A. Zdziarski
; G.G. Pooley
; | | Date: |
19 Apr 2005 | | Subject: | astro-ph | | Affiliation: | 1,2), J. Wilms , M.A. Nowak , S. Larsson , A.A. Zdziarski , and G.G. Pooley ( MPE, ISDC, University of Warwick, MIT-CXC, Stockholm Observatory, Copernicus Center, Cavendish Laboratory | | 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. | | Source: | arXiv, astro-ph/0504403 | | Services: | Forum | Review | PDF | Favorites | |
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