Time-Evolution of the Power Spectrum of the Black Hole X-ray Nova XTE J1550-564

Details Time-Evolution of the Power Spectrum of the Black Hole X-ray Nova XTE J1550-564 Time-Evolution of the Power Spectrum of the Black Hole X-ray Nova XTE J1550-564

2001-04-03

arxiv.org/abs/astro-ph/0104057v1

Astronomy and Astrophysics

Astrophysics

4 pages, 3 figures; 2001 IEEE - EURASIP Workshop on Nonlinear Signal and Image Processing (June 3-6, 2001), and to appear in t

Scientific paper

We have studied the time evolution of the power spectrum of XTE J1550-564, using X-ray luminosity time series data obtained by the Rossi X-Ray Timing Explorer satellite. A number of important practical fundamental issues arise in the analysis of these data, including dealing with time-tagged event data, removal of noise from a highly non-stationary signal, and comparison of different time-frequency distributions. We present two new methods to understand the time frequency variations, and compare them to the dynamic power spectrum of Homan et al. All of the approaches provide evidence that the QPO frequency varies in a systematic way during the time evolution of the signal.

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