First INTEGRAL observations of Cygnus X-3

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.

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

References in corpus (11)

• ISGRI: the INTEGRAL Soft Gamma-Ray Imager
• Radiation mechanisms and geometry of Cygnus X-1 in the soft state
• The INTEGRAL/IBIS Scientific Data Analysis
• Understanding the long-term spectral variability of Cygnus X-1 with BATSE and ASM observations
• OSSE and RXTE Observations of GRS 1915+105: Evidence for Non-thermal Comptonization
• Discovery of Correlated Behavior Between the HXR and the Radio Bands in Cygnus X-3
• IBIS/PICsIT in-flight performances
• New Measurements of Orbital Period Change in Cygnus X-3
• The Spiros imaging software for the Integral SPI spectrometer
• NGC 4151: an intrinsically average Seyfert 1
• First results of IBIS/ISGRI Cygnus X-3 monitoring during INTEGRAL PV phase

Cited by in corpus (22)

• The Hardness-Intensity Diagram of Cygnus X-3: Revisiting the Radio/X-Ray States
• Characterizing a new class of variability in GRS 1915+105 with simultaneous INTEGRAL/RXTE observations
• Orbital modulation of X-ray emission lines in Cygnus X-3
• Effects of the stellar wind on X-ray spectra of Cygnus X-3
• Spectral variability in Cygnus X-3
• The nature of the hard state of Cygnus X-3
• Compton scattering as the explanation of the peculiar X-ray properties of Cyg X-3
• Probing the behaviour of the X-ray binary Cygnus X-3 with very-long-baseline radio interferometry
• Energy-dependent orbital modulation of X-rays and constraints on emission of the jet in Cyg X-3
• A classification of the X-ray and radio states of Cyg X-3 and their long-term correlations
• Jet radio emission in Cygnus X-1 and its orbital modulation
• 2006 May-July Major Radio Flare episodes in Cygnus X-3: spectro-timing analysis of the X-ray data
• Integral/Ibis Census of the Sky Beyond 100 kev
• X-ray timing analysis of Cyg X-3 using AstroSat/LAXPC: Detection of milli-hertz quasi-periodic oscillations during the flaring hard X-ray state
• Downscattering due to Wind Outflows in Compact X-ray Sources: Theory and Interpretation
• Wind suppression by X-rays in Cygnus X-3
• First results of IBIS/ISGRI Cygnus X-3 monitoring during INTEGRAL PV phase
• The Reoccurrence of mHz QPOs in Cygnus X-3
• Cygnus X-3 transition from the ultrasoft to the hard state
• HAWC Search for High-Mass Microquasars
• Secrets behind the RXTE/ASM light curve of Cyg X-3
• Birthplaces of X-ray emission lines in Cygnus X-3