AGN X-ray light curves - Shot noise or low-dimensional attractor?

Details AGN X-ray light curves - Shot noise or low-dimensional attractor? AGN X-ray light curves - Shot noise or low-dimensional attractor?

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.261..125l&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 261, no. 1, p. 125-143.

Astronomy and Astrophysics

Astronomy

16

Active Galactic Nuclei, Chaos, Light Curve, Shot Noise, Strange Attractors, X Ray Astronomy, Correlation, Exosat Satellite, Mathematical Models, White Noise

Scientific paper

We use correlation integrals to determine whether the X-ray variability of AGNs, as seen in EXOSAT observations, arises from chaotic systems. We distinguish three characteristic types of behavior and analyze a number of simulated light curves, to investigate the poorly understood limitations to the correlation integral method caused by noise and sampling. This enables us to identify three out of eight sources as being consistent with white noise, and four sources as being consistent with a shot-noise model with a range of shot amplitudes or decay times. The light curve of only one source, NGC 4051, appears to harbor a low-dimensional attractor of dimension lower than 4.5, implying that the variability may be chaotic. Because NGC 4051 is intrinsically a factor of about 100 fainter than the other sources, the time-scales we sample could reflect global (chaotic) behavior in that source, whereas the same time-scale would reflect local (shot/white noise) behavior in the other sources.

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