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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
INTEGRAL/RXTE high-energy observation of a state transition of GX 339-4
Monthly Notices of the Royal Astronomical Society, Volume 367, No. 3, Year 2006
Notification
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Description
On 2004 August 15, we observed a fast (shorter than 10 h) state transition in the bright black hole transient GX 339-4 simultaneously with Rossi X-Ray Timing Explorer (RXTE) and INTEGRAL. This transition was evident both in timing and spectral properties. Combining the data from the Proportional Counter Array (PCA), the High-Energy X-ray Timing Experiment (HEXTE) and the Imager on Board the INTEGRAL Satellite (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 cut-off 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 cut-off 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. © 2006 RAS.
Authors & Co-Authors
Belloni, Tomaso M.
Italy, Merate
Osservatorio Astronomico Di Brera
Del Santo, M. G.
Italy, Rome
Inaf Istituto Di Astrofisica Spaziale e Fisica Cosmica, Rome
Homan, Jeroen
United States, Cambridge
Massachusetts Institute of Technology
Casella, Piergiorgio
Italy, Merate
Osservatorio Astronomico Di Brera
Fender, Robert P.
United Kingdom, Southampton
University of Southampton
Lewin, Walter H.G.
United States, Cambridge
Massachusetts Institute of Technology
Ḿendez, Mariano R.
Netherlands, Utrecht
Sron Netherlands Institute for Space Research
Mïller, Jon M.
United States, Cambridge
Massachusetts Institute of Technology
van der Klis, Michiels D.
Netherlands, Amsterdam
Universiteit Van Amsterdam
Statistics
Citations: 90
Authors: 9
Affiliations: 6
Identifiers
Doi:
10.1111/j.1365-2966.2006.09999.x
ISSN:
00358711
Study Approach
Quantitative