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Proceedings Paper

Estimating the instantaneous power spectrum of an x-ray binary system
Author(s): Lorenzo Galleani; Leon Cohen; Douglas J. Nelson; Jeffrey D. Scargle
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Paper 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.

Paper Details

Date Published: 1 November 2001
PDF: 8 pages
Proc. SPIE 4477, Astronomical Data Analysis, (1 November 2001); doi: 10.1117/12.447165
Show Author Affiliations
Lorenzo Galleani, Politecnico di Torino (Italy)
Leon Cohen, CUNY/Hunter College (United States)
Douglas J. Nelson, U.S. Department of Defense (United States)
Jeffrey D. Scargle, NASA Ames Research Ctr. (United States)

Published in SPIE Proceedings Vol. 4477:
Astronomical Data Analysis
Jean-Luc Starck; Fionn D. Murtagh, Editor(s)

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