# 2006A&A...446..591C

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 Query : 2006A&A...446..591C

2006A&A...446..591C - Astronomy and Astrophysics, volume 446, 591-602 (2006/2-1)

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

CADOLLE-BEL M., SIZUN P., GOLDWURM A., RODRIGUEZ J., LAURENT P., ZDZIARSKI A.A., FOSCHINI L., GOLDONI P., GOUIFFES C., MALZAC J., JOURDAIN E. and ROQUES J.-P.

Abstract (from CDS):

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 (5keV-1MeV) 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.

Journal keyword(s): black hole physics - stars: individual: Cygnus X-1 - gamma rays: observations - X-rays: binaries - X-rays: general

Full paper

 Number of rows : 8
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 V* CM Tau Psr 05 34 31.9474694616 +22 00 52.153698024           ~ 5090 0
2 M 1 SNR 05 34 32 +22 00.8           ~ 5973 1
3 V* V381 Nor HXB 15 50 58.6637920704 -56 28 35.258385000   17.95 16.6     K3III 1108 0
4 [GHJ2008] 3 HXB 16 50 00.980 -49 57 43.60     11.89     K4V 370 0
5 V* V821 Ara HXB 17 02 49.3876391280 -48 47 23.087954544 16.20 16.30 15.5     ~ 1956 0
6 HD 226868 HXB 19 58 21.6757355952 +35 12 05.784512688 9.38 9.72 8.91 8.42   O9.7Iabpvar 4162 0
7 V* V2246 Cyg HXB 20 32 15.2749858128 +37 38 14.843024844   22.16 19.41 17.32 15.18 B0Ve 405 0
8 V* V1521 Cyg HXB 20 32 25.78 +40 57 27.9           WN4/5-6/7 1876 2

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2022.11.28-12:22:18