Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-07-28
Astrophys.J. 544 (2001) L183-L186
Astronomy and Astrophysics
Astrophysics
11 pages, 2 figures
Scientific paper
10.1086/324756
We report on timing and spectral observations of the 2000 outburst of XTE J1550-564 made by the Unconventional Stellar Aspect (USA) Experiment on board the Advanced Research and Global Observation Satellite (ARGOS). We observe a low-frequency quasi-periodic oscillation (LFQPO) with a centroid frequency that tends to increase with increasing flux and a fractional rms amplitude which is correlated with the hardness ratio. The evolution of the hardness ratio (4--16 keV/1--4 keV) with time and source flux is examined. The hardness-intensity diagram (HID) shows a cyclical movement in the clockwise direction and possibly indicates the presence of two independent accretion flows. We observe a relationship between the USA 4--16 keV count rate and radio observations and discuss this in the context of previously observed correlations between X-ray, radio, optical and IR data. We examine our results in the context of models invoking two accretion flows: a thin disk and a hot sub-Keplerian flow.
Bandyopadhyay Reba M.
Bloom Elliott D.
Focke Warren
Fritz Georg
Giebels Berrie
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