INTEGRAL-RXTE observations of Cygnus X-1

Details INTEGRAL-RXTE observations of Cygnus X-1 INTEGRAL-RXTE observations of Cygnus X-1

2003-09-06

arxiv.org/abs/astro-ph/0309203v1

AIP Conf.Proc.714:116-119,2004; Astron.Astrophys.411:L383-L388,2003

Astronomy and Astrophysics

Astrophysics

6 pages, 3 figures. Figs. 2 and 3 are best viewed in color. Accepted for publication in the INTEGRAL special edition of A&AL

Scientific paper

10.1063/1.1781011

We present first results from contemporaneous observations of Cygnus X-1 with INTEGRAL and RXTE, made during INTEGRAL's performance verification phase in 2002 November and December. Consistent with earlier results, the 3-250 keV data are well described by Comptonization spectra from a Compton corona with a temperature of kT~50-90 keV and an optical depth of tau~1.0-1.3 plus reflection from a cold or mildly ionized slab with a covering factor of Omega/2pi~0.2-0.3. A soft excess below 10 keV, interpreted as emission from the accretion disk, is seen to decrease during the 1.5 months spanned by our observations. Our results indicate a remarkable consistency among the independently calibrated detectors, with the remaining issues being mainly related to the flux calibration of INTEGRAL.

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