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23 April 2024

» arxiv » astro-ph/0308395

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First INTEGRAL observations of Cygnus X-3
O. Vilhu ; L. Hjalmarsdotter ; A.A. Zdziarski ; A. Paizis ; M.L. McCollough ; V. Beckmann ; T.J.-L. Courvoisier ; K. Ebisawa ; P. Kretschmar ; P. Goldoni ; N.J. Westergaard ; P. Hakala ; D. Hannikainen ;
Date:	22 Aug 2003
Journal:	Astron.Astrophys. 411 (2003) L405-L410
Subject:	astro-ph
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 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.
Source:	arXiv, astro-ph/0308395
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