First INTEGRAL observations of Cygnus X-3

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作者：

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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