INTEGRAL-RXTE observations of Cygnus X-1

K. Pottschmidt, J. Wilms, M. Chernyakova, M.A. Nowak, J. Rodriguez, A.A. Zdziarski, V. Beckmann, P. Kretschmar, T. Gleissner, G.G. Pooley, S. Martinez-Nunez, T.J.L. Courvoisier, V. Schonfelder, R. Staubert

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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 kTsimilar to50-90 keV and an optical depth of tausimilar to1.0-1.3 plus reflection from a cold or mildly ionized slab with a covering factor of Omega/2pisimilar to0.2-0.3. 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.
Original languageEnglish
JournalAstronomy & Astrophysics
Issue number1
Pages (from-to)L383-L388
Publication statusPublished - 2003


  • gamma rays : observations
  • stars : individual : Cyg X-1
  • black hole physics
  • X-rays : general
  • X-rays : binaries


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