Author/Authors :
Ebisawa، K. نويسنده , , Goldoni، P. نويسنده , , Zdziarski، A. A. نويسنده , , Hannikainen، D. C. نويسنده , , Kretschmar، P. نويسنده , , Courvoisier، T. J.-L. نويسنده , , Beckmann، V. نويسنده , , Westergaard، N. J. نويسنده , , Vilhu، O. نويسنده , , Paizis، A. نويسنده , , Hjalmarsdotter، L. نويسنده , , McCollough، M. L. نويسنده , , Hakala، P. نويسنده ,
Abstract :
We present the first INTEGRAL results on Cyg X-3 from the PV phase observations of the Cygnus region. The source was clearly detected by the JEM-X, ISGRI and SPI. The INTEGRAL observations were supported by simultaneous pointed RXTE observations. Their lightcurves folded over the 4.8 hour binary period are compatible with the mean RXTE/ASM and CGRO/BATSE light curves. We fit our broad-band X-ray/ (gamma)-ray spectra with a physical model, which represents the first such published model for Cyg X-3. The main physical processes in the source are thermal Comptonization and Compton reflection with parameters similar to those found for black-hole binaries at high Eddington rates.
Keywords :
X-rays: binaries , gamma rays: observations , radiation mechanisms: non-thermal , stars: individual: Cyg X-3 , X-rays: general , X-rays: stars
