The broad-band spectrum of Cygnus X-1 measured by INTEGRAL

Abstract

The INTEGRAL satellite extensively observed the black hole binary Cygnus X-1 from 2002 November to 2004 November during calibration, open time and core program (Galactic Plane Scan) observations. These data provide evidence for significant spectral variations over the period. In the framework of the accreting black hole phenomenology, the source was most of the time in the Hard State and occasionally switched to the so-called "Intermediate State". Using the results of the analysis performed on these data, we present and compare the spectral properties of the source over the whole energy range (5 keV - 1 MeV) covered by the high-energy instruments on board INTEGRAL, in both observed spectral states. Fe line and reflection component evolution occurs with spectral changes in the hard and soft components. The observed behaviour of Cygnus X-1 is consistent with the general picture of galactic black holes. Our results give clues to the physical changes that took place in the system (disc and corona) at almost constant luminosity during the spectral transitions and provide new measures of the spectral model parameters. In particular, during the Intermediate State of 2003 June, we observe in the Cygnus X-1 data a high-energy tail at several hundred keV in excess of the thermal Comptonization model which suggests the presence of an additional non-thermal component.

accepted for publication in A&A, 13 pages, 9 figures (3 in colour)

References in corpus (15)

• ISGRI: the INTEGRAL Soft Gamma-Ray Imager
• Radiative Processes, Spectral States and Variability of Black-Hole Binaries
• GX 339-4: the distance, state transitions, hysteresis and spectral correlations
• The INTEGRAL/IBIS Scientific Data Analysis
• On the Origin of Radio Emission in the X-ray States of XTE J1650-500 during the 2001-2002 Outburst
• SPI/INTEGRAL in-flight performance
• Evolutionary constraints on the masses of the components of HDE 226868/Cyg X-1 binary system
• Long Term Variability of Cyg X-1, II. The rms-Flux Relation
• Constraining X-ray Binary Jet Models via Reflection
• IBIS/PICsIT in-flight performances
• Long term variability of Cygnus X-1, III. Radio-X-ray correlations
• Is the `IR Coincidence' Just That?
• The Spiros imaging software for the Integral SPI spectrometer
• SPI/INTEGRAL observation of the Cygnus region
• IBIS preliminary results on Cygnus X-1 spectral and temporal characteristics

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