Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-01-02
Mon.Not.Roy.Astron.Soc. 367 (2006) 1113-1120
Astronomy and Astrophysics
Astrophysics
Accepted for publication in MNRAS (9 pages, 6 figures)
Scientific paper
10.1111/j.1365-2966.2006.09999.x
On 2004 August 15, we observed a fast (shorter than 10 hours) state transition in the bright black-hole transient GX 339-4 simultaneously with RossiXTE and INTEGRAL. This transition was evident both in timing and spectral properties. Combining the data from PCA, HEXTE and IBIS, we obtained good quality broad-band (3-200 keV) energy spectra before and after the transition. These spectra indicate that the hard component steepened. Also, the high-energy cutoff that was present at ~70 keV before the transition was not detected after the transition. This is the first time that an accurate determination of the broad-band spectrum across such a transition has been measured on a short time scale. It shows that, although some spectral parameters do not change abruptly through the transition, the high-energy cutoff increases/disappears rather fast. These results constitute a benchmark on which to test theoretical models for the production of the hard component in these systems.
Belloni Tomaso
Casella Piergiorgio
Del Santo Melania
Fender Rob P.
Homan Jeroen
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