Astronomy and Astrophysics – Astrophysics – High Energy Astrophysical Phenomena
Scientific paper
2010-06-08
Astronomy and Astrophysics
Astrophysics
High Energy Astrophysical Phenomena
5 pages, 4 figures, accepted by MNRAS
Scientific paper
LS I+61303 is one of the few high-mass X-ray binaries that have been recently observed at TeV and GeV energies. Here we investigate the hard X-ray spectral and timing properties of this source using the IBIS/ISGRI instrument on-board the INTEGRAL satellite. We carry out a systematic analysis based on all available INTEGRAL data since December 28, 2002 up to April 30, 2008. The total exposure time analyzed amounts to 2.1 Ms, hence more than doubling the previous reported sample. The source is best detected in the 18-60 keV band, with a significance level of 12.0 sigma. The hard X-ray data are best fit with a simple power law with a photon index of ~ 1.7+-0.2. We detect a periodical signal at 27 +- 4 days, matching the orbital period of 26.496 days previously reported at other wavelengths. The hard X-rays orbital lightcurve is obtained and compared with those derived at other frequencies.
Chen Yu-peng
Li Jian
Rea Nanda
Torres Diego F.
Wang Jianmin
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