Estimating the instantaneous power spectrum of an x-ray binary system

Details Estimating the instantaneous power spectrum of an x-ray binary system Estimating the instantaneous power spectrum of an x-ray binary system

Nov 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001spie.4477..123g&link_type=abstract

Proc. SPIE Vol. 4477, p. 123-130, Astronomical Data Analysis, Jean-Luc Starck; Fionn D. Murtagh; Eds.

Computer Science

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Scientific paper

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.

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