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Abstract: In the study of black-hole transients, an important problem that still needsto be answered is how the high-energy part of the spectrum evolves from thelow-hard to the high-soft state, given that they have very differentproperties. Recent results obtained with RXTE and INTEGRAL have giveninconsistent results. With RXTE, we have found that the high-energy cutoff inGX 339-4 during the transition first decreases during the low-hard state,then increases again across the Hard-Intermediate state, to become unmeasurablein the soft states possibly because of statistical limitations. We showSimbol-X will be able to determine the spectral shape with superb accuracy. Asthe high-energy part of the spectrum is relatively less known than the onebelow 20 keV, Simbol-X will provide important results that will help outunderstanding of the extreme physical conditions in the vicinity of astellar-mass black hole.



Author: Tomaso M. Belloni INAF-OAB, Sara Motta Univ. Insubria and INAF-OAB

Source: https://arxiv.org/







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