Volume 408, Number 1, September II 2003
|Page(s)||347 - 352|
|Section||Stellar structure and evolution|
|Published online||17 November 2003|
The X-ray spectrum of the black hole candidate GX339-4 in a low state
IASF-CNR, Sezione di Milano “G. Occhialini”, via Bassini 15, 20133 Milano, Italy
2 Dipartimento di Scienze Fisiche, Università degli Studi di Milano, via Celoria 16, 20133 Milano, Italy
3 INAF – Osservatorio Astronomico di Cagliari, Loc. Poggio dei Pini, strada 54, 09012 Capoterra, Italy
4 Dipartimento di Scienze, Università dell'Insubria/Como, via Valleggio 11, 22100 Como, Italy
5 Dipartimento di Fisica, Università di Milano Bicocca, piazza delle Scienze 3, 20126 Milano, Italy
6 INAF – Osservatorio Astronomico di Brera, via E. Bianchi 46, 23807 Merate, Italy
Corresponding author: A. Corongiu, email@example.com
Accepted: 12 June 2003
We report on four observations of the black hole candidate GX 339-4 collected in the spectral range 0.4-140 keV with the BeppoSAX satellite during 1997. All our spectra are typical of a black hole candidate in its low-hard state, i.e. are dominated by the hard tail of the emission from the corona. Although the direct emission from the accretion disk in the soft X-ray range is weak, spectra are well described only with models that take into consideration the Compton reflection of hard X-rays from the corona onto the surface of an accretion disk of non negligible extent.
Key words: accretion, accretion disks / binaries: general / stars: individual (GX 339-4) / X-rays: stars / black hole physics
© ESO, 2003
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