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

Lorenzo Galleani; Leon Cohen; Douglas J. Nelson; Jeffrey D. Scargle

doi:10.1117/12.447165

1 November 2001 Estimating the instantaneous power spectrum of an x-ray binary system

Lorenzo Galleani, Leon Cohen, Douglas J. Nelson, Jeffrey D. Scargle

Author Affiliations +

Proceedings Volume 4477, Astronomical Data Analysis; (2001) https://doi.org/10.1117/12.447165
Event: International Symposium on Optical Science and Technology, 2001, San Diego, CA, United States

Abstract

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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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); https://doi.org/10.1117/12.447165

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