Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-04-07
Mon.Not.Roy.Astron.Soc. 360 (2005) 763-768
Astronomy and Astrophysics
Astrophysics
Accepted for publication in MNRAS - 7 pages
Scientific paper
10.1111/j.1365-2966.2005.09069.x
We present the results of spectral fits made to 57 pointed observations of the Galactic black hole candidate and X-ray transient XTE J1650-500, made with the Rossi X-ray Timing Explorer in 2001 when the source was in a transition from the hard state to the soft state. A strong and variable Fe K-alpha emission line is detected in these spectra. The line flux varies in a non-linear way with the hard X-ray flux, in apparent contradiction to the predictions of simple disc reflection models. We observe a change in the overall trend that coincides with changes in t he continuum X-ray spectrum and the fast X-ray variability. The Fe-line flux versus hard X-ray flux variations are consistent with the predictions of reflection models which consider high disc-ionization states and with a model which considers gravitational light-bending effects. Indications for an anti-correlation between the Fe-line flux and the hard X-ray flux in the spectrally hardest observations and weak variations in the Fe-line energy (as observed with XMM-Newton and BeppoSAX) slightly favour the light-bending interpretation.
Belloni Tomaso
Homan Jeroen
Miller John Mcl.
Rossi Sabrina
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