First INTEGRAL observations of Cygnus X-3

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机构：
[1] [1,Vilhu, O.
[2] Hjalmarsdotter, L.
[3] Zdziarski, A.A.
[4] 1,Paizis, A.
[5] McCollough, M.L.
[6] 1,Beckmann, V.
[7] 1,Courvoisier, T.J.-L.
[8] 1,Ebisawa, K.
[9] Goldoni, P.
[10] Hakala, P.
[11] Hannikainen, D.
[12] 1,Kretschmar, P.
[13] Westergaard, N.J.
来源：
Vilhu, O. (osmi.vilhu@helsinki.fi) | 1600年 / EDP Sciences卷 / 411期
关键词：
Algorithms - Gamma rays - Image analysis - Mathematical models - Signal to noise ratio - Space research - Spectrum analysis - Telescopes - X rays;
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摘要：
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/γ-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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