Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-02-04
Astronomy and Astrophysics
Astrophysics
13 pages, 6 figures, in "Noise and Fluctuations" Proc. SPIE vol. 6603
Scientific paper
The fluctuating brightness of cosmic X-ray sources, particularly accreting black holes and neutron star systems, has enabled enormous progress in understanding the physics of turbulent accretion flows, the behaviour of matter on the surfaces of neutron stars and improving the evidence for black holes. Most of this progress has been made by analysing and modelling time series data in terms of their power and cross spectra, as will be discussed in other articles in this volume. Recently, attempts have been made to make use of other aspects of the data, by testing for non-linearity, non-Gaussianity, time asymmetry and by examination of higher order Fourier spectra. These projects, which have been made possible by the vast increase in data quality and quantity over the past decade, are the subject of this article.
Uttley Phil
Vaughan Stewart
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