Rxte Observations Of Cygnus X-1 And Detection Of A Qpo At 134 Hz

Details Rxte Observations Of Cygnus X-1 And Detection Of A Qpo At 134 Hz Rxte Observations Of Cygnus X-1 And Detection Of A Qpo At 134 Hz

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006head....9.0135r&link_type=abstract

American Astronomical Society, HEAD meeting #9, #1.35; Bulletin of the American Astronomical Society, Vol. 38, p.334

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We have examined the spectral and temporal properties of Cygnus X-1 using the extensive public archive of RXTE observations (1996-2005). Data were organized into 627 intervals of duration one-half day or less. We show normalized color-intensity diagrams and the results of spectral fits to these data. All of the soft-state spectra correspond to 'steep power-law' or intermediate states, while none represent the thermal state. The weak presence of the thermal component at 2-20 keV distinguishes Cyg X-1 from other black hole binaries, as noted in previous studies. The results help to define groups of observations that span the spectral variations in this source. Average power density spectra are shown for each group, and a QPO at 134 Hz is found (10 sigma) for one of the groups. We discuss these results in terms of ongoing efforts to connect high-frequency QPOs to the mass and spin of the black hole via effects of general relativity.

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