Query : 2017A&A...603A...8W

2017A&A...603A...8W - Astronomy and Astrophysics, volume 603A, 8-8 (2017/7-1)

Observations of Cygnus X-1 in the MeV band by the INTEGRAL imager.


Abstract (from CDS):

Context. The spectrum of the MeV tail detected in the black-hole candidate Cygnus X-1 remains controversial as it appeared much harder when observed with the INTEGRAL Imager IBIS than with the INTEGRAL spectrometer SPI or CGRO.
Aims. We present an independent analysis of the spectra of Cygnus X-1 observed by IBIS in the hard and soft states.
Methods. We developed a new analysis software for the PICsIT detector layer and for the Compton mode data of the IBIS instrument and calibrated the idiosyncrasies of the PICsIT front-end electronics.
Results. The spectra of Cygnus X-1 obtained for the hard and soft states with the INTEGRAL imager IBIS are compatible with those obtained with the INTEGRAL spectrometer SPI, with CGRO, and with the models that attribute the MeV hard tail either to hybrid thermal/non-thermal Comptonisation or to synchrotron emission.

Abstract Copyright: © ESO, 2017

Journal keyword(s): gamma rays: stars - X-rays: binaries - stars: black holes - methods: data analysis - acceleration of particles - accretion, accretion disks - accretion, accretion disks

Simbad objects: 2

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Number of rows : 2
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 M 1 SNR 05 34 30.9 +22 00 53           ~ 6097 1
2 HD 226868 HXB 19 58 21.6757355952 +35 12 05.784512688 9.38 9.72 8.91 8.42   O9.7Iabpvar 4269 0

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