Hard X-ray emission of the microquasar GX 339-4 in the low/hard state

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dc.creatorJoinet, A.
dc.creatorJourdain, E.
dc.creatorMalzac, J.
dc.creatorRoques, J. P.
dc.creatorCorbel, S.
dc.creatorRodriguez, J.
dc.creatorKalemci, E.
dc.date2006-11-02
dc.date.accessioned2026-07-07T10:24:06Z
dc.date.available2026-07-07T10:24:06Z
dc.descriptionWe present the analysis of the high energy emission of the Galactic black hole binary GX 339-4 in a low/hard state at the beginning of its 2004 outburst. The data from 273 ks of INTEGRAL observations, spread over 4 weeks, are analyzed, along with the existing simultaneous RXTE HEXTE and PCA data. During this period, the flux increases by a factor of about 3, while the spectral shape is quite unchanged, at least up to 150 keV. The high energy data allows us to detect the presence of a high energy cut-off, generally related to thermal mechanisms, and to estimate the plasma parameters in the framework of the Comptonization models. We found an electron temperature of 60-70 keV, an optical depth around 2.5, with a rather low reflection factor (0.2-0.4). In the last observation, we detected a high energy excess above 200 keV with respect to thermal Comptonization while at lower energy, the spectrum is practically identical to the previous one, taken just 2 days before. This suggests that the low and high energy components have a different origin.
dc.description12 pages, 6 figures, accepted for publication in ApJ
dc.identifierhttps://arxiv.org/abs/astro-ph/0611064
dc.identifierhttp://arxiv.org/abs/astro-ph/0611064
dc.identifierAstrophys.J.657:400-408,2007
dc.identifierdoi:10.1086/510326
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/176071
dc.subjectAstrophysics
dc.titleHard X-ray emission of the microquasar GX 339-4 in the low/hard state
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