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RXTE Observation of Cygnus X-1 In Its High State | | W. Cui
; W. A. Heindl
; R. E. Rothschild
; S. N. Zhang
; K. Jahoda
; W. Focke
; | | Date: |
10 Oct 1996 | | Subject: | astro-ph | | Affiliation: | MIT, UCSD, MSFC, GSFC | | Abstract: | We present the results from the RXTE observations of Cygnus X-1 in its high state. In the energy range of 2-200 keV, the observed X-ray spectrum can be described by a model consisting of a soft blackbody component and a broken power-law with a high energy cutoff. The low energy spectrum (below about 11 keV) varies significantly from observation to observation while the high energy portion changes little. The X-ray flux varies on all timescales down to milliseconds. The power density spectrum (PDS) can be characterized by excess red noise (``1/f’’) at low frequencies and a white noise component that extends to 1-3 Hz before being cut off. At higher frequencies, the PDS becomes power-law again, with a slope of roughly -2 (i.e., ``1/f^2’’). Broad peaks in the range of 3-9 Hz are present, and might be due to quasi-periodic oscillations. The PDS shows interesting spectral dependence: the 1/f component becomes more prominent when the low-energy spectrum becomes softer. The difference in the observed spectral and timing properties between the low and high states is qualitatively consistent with a simple ``fluctuating corona’’ model. | | Source: | arXiv, astro-ph/9610071 | | Services: | Forum | Review | PDF | Favorites | |
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