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1 November 2001 Estimating the instantaneous power spectrum of an x-ray binary system
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We study time series of the X-ray intensity of the binary XTE-J1550-564 with the goal of estimating its instantaneous power spectrum. We develop a method that, from the initial sequence of photon arrival times, is able to estimate the time-frequency spectrum in conjunction with noise reduction techniques. This method clearly highlights the presence of a quasi-periodic oscillation (QPO), a spectral component the frequency of which changes in time. Furthermore, the QPO is extracted by using signal processing methods in the time-frequency plane. The method is also validated using a synthetic signal to show the quality and reliability of its performance.
© (2001) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Lorenzo Galleani, Leon Cohen, Douglas J. Nelson, and Jeffrey D. Scargle "Estimating the instantaneous power spectrum of an x-ray binary system", Proc. SPIE 4477, Astronomical Data Analysis, (1 November 2001);


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