First INTEGRAL observations of Cygnus X-3

Details First INTEGRAL observations of Cygnus X-3 First INTEGRAL observations of Cygnus X-3

2003-08-22

arxiv.org/abs/astro-ph/0308395v1

Astron.Astrophys.411:L405-L410,2003

Astronomy and Astrophysics

Astrophysics

6 pages, 5 colour figures, accepted for Astronomy and Astrophysics Letters, a special INTEGRAL issue

Scientific paper

10.1051/0004-6361:20031257

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 detectors. 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.

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