X-ray light curves of active galactic nuclei are phase incoherent

Details X-ray light curves of active galactic nuclei are phase incoherent X-ray light curves of active galactic nuclei are phase incoherent

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...402..432k&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 402, no. 2, p. 432-440.

Mathematics

Dynamical Systems

12

Active Galactic Nuclei, Astronomical Models, Light Curve, X Ray Spectra, Dynamical Systems, Exosat Satellite, Fourier Transformation, Luminosity

Scientific paper

We compute the Fourier phase spectra for the light curves of five low-luminosity active galactic nuclei observed by EXOSAT. There is no statistically significant phase coherence in any of them. This statement is equivalent, subject to a technical caveat, to a demonstration that their fluctuation statistics are Gaussian. Models in which the X-ray output is controlled wholly by a unitary process undergoing a nonlinear limit cycle are therefore ruled out, while models with either a large number of randomly excited independent oscillation modes or nonlinearly interacting spatially dependent oscillations are favored. We also demonstrate how the degree of phase coherence in light curve fluctuations influences the application of causality bounds on internal length scales.

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