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Title:
Black-hole Binaries: Life Begins at 40 keV
Authors:
Belloni, Tomaso M.; Motta, Sara
Affiliation:
AA(INAF-Osservatorio Astronomico di Brera, Via E. Bianchi 46, I-23807 Merate, Italy), AB(Università dell'Insubria, Como, Via Valleggio 11, I-22100 Como, Italy & INAF-Osservatorio Astronomico di Brera, Via E. Bianchi 46, I-23807 Merate, Italy)
Publication:
SIMBOL-X: FOCUSING ON THE HARD X-RAY UNIVERSE: Proceedings of the 2nd International Simbol-X Symposium. AIP Conference Proceedings, Volume 1126, pp. 185-188 (2009). (AIPC Homepage)
Publication Date:
05/2009
Origin:
AIP
PACS Keywords:
Galactic nuclei , circumnuclear matter, and bulges, X-ray, Astronomical observations, Normal galaxies; extragalactic objects and systems
DOI:
10.1063/1.3149408
Bibliographic Code:
2009AIPC.1126..185B

Abstract

In the study of black-hole transients, an important problem that still needs to be answered is how the high-energy part of the spectrum evolves from the low-hard to the high-soft state, given that they have very different properties. Recent results obtained with RXTE and INTEGRAL have given inconsistent results. With RXTE, we have found that the high-energy cutoff in GX 339-4 during the transition first decreases (during the low-hard state), then increases again across the Hard-Intermediate state, to become unmeasurable in the soft states (possibly because of statistical limitations). We show Simbol-X will be able to determine the spectral shape with superb accuracy. As the high-energy part of the spectrum is relatively less known than the one below 20 keV, Simbol-X will provide important results that will help out understanding of the extreme physical conditions in the vicinity of a stellar-mass black hole.
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