Rossi X-Ray Timing Explorer Observation of Cygnus X-1 in Its High State

Details Rossi X-Ray Timing Explorer Observation of Cygnus X-1 in Its High State Rossi X-Ray Timing Explorer Observation of Cygnus X-1 in Its High State

Jan 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...474l..57c&link_type=abstract

Astrophysical Journal Letters v.474, p.L57

Astronomy and Astrophysics

Astronomy

84

Stars: Binaries: General, Stars: Individual Constellation Name: Cygnus X-1, X-Rays: Stars

Scientific paper

We present the results from the Rossi X-Ray Timing Explorer 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 ~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/f2"). 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.

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