Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 342, Issue 4, Pages 1083-1092Publisher
BLACKWELL PUBLISHING LTD
DOI: 10.1046/j.1365-8711.2003.06591.x
Keywords
accretion, accretion discs; radiation mechanisms : non-thermal; X-rays : binaries; X-rays : individual : XTE J1550-564
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We fit the broad-band X-ray/gamma-ray spectrum (0.8-1000 keV) of the accreting black hole XTE J1550-564 in the very high state. The quasi-simultaneous data from ASCA , RXTE and OSSE (on CGRO) show that the disc is strongly Comptonized, with a high-energy tail extending out to several hundred keV. However, inverse Compton scattering by a purely thermal or purely power-law electron distribution cannot explain the observed spectrum. Instead, the data require a hybrid distribution, with both thermal and non-thermal electrons scattering the disc photons. This is very similar to the electron distribution inferred for other high and very high state black hole binaries, showing that it is a generic feature of high mass accretion rate black holes.
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