Coherence effects on quasi-periodic oscillations from Galactic X-ray sources

Details Coherence effects on quasi-periodic oscillations from Galactic X-ray sources Coherence effects on quasi-periodic oscillations from Galactic X-ray sources

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...320..527e&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 320, Sept. 15, 1987, p. 527-536.

Other

10

Coherence, Galactic Structure, Power Spectra, Shot Noise, Stellar Oscillations, X Ray Sources, Drift, Galactic Bulge, Mathematical Models, Monte Carlo Method, Periodic Variations, Random Walk

Scientific paper

Shot noise models provide a useful mathematical representation for some physical models for the quasi-periodic oscillations (QPO) recently observed from several Galactic bulge and burst X-ray sources. For such models, correlations between the shot onset times and oscillation phases can have important effects on the expected autocorrelation function and power spectrum. Making use of analytic and Monte Carlo techniques, the authors have examined in detail two physically plausible correlations of this kind, one corresponding to drift and jitter in the oscillation phase and the other to a random walk in the oscillation phase. The effects of coherence on the expected power spectrum for both cases are examined.

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