The X-ray / gamma-ray spectrum of XTE J1550-564 in the very high state - INSPIRE

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The X-ray / gamma-ray spectrum of XTE J1550-564 in the very high state

Marek Gierlinski
(
- Durham U. and
- Jagiellonian U., Astron. Observ.
)
,
Chris Done
(
- Durham U.
)

Dec, 2002

9 pages

Published in:

Mon.Not.Roy.Astron.Soc. 342 (2003) 1083

e-Print:

astro-ph/0212384 [astro-ph]

DOI:

10.1046/j.1365-8711.2003.06591.x

View in:

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Abstract: (arXiv)

We fit the broad-band X/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 show that the disc is strongly Comptonized, with a high energy tail extending out to several hundreds 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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