Characterizing X-ray Variability Processes in AGN

Details Characterizing X-ray Variability Processes in AGN Characterizing X-ray Variability Processes in AGN

Jul 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aspc..350...51m&link_type=abstract

Blazar Variability Workshop II: Entering the GLAST Era ASP Conference Series, Vol. 350, Proceedings of the Conference Held 10-12

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We comment on searches for characteristic X-ray variability time- scales in the red-noise light curves of Active Galactic Nuclei (AGN). Methods for identification of such features and determining their statistical significance are discussed. Pros and cons of two common tools, the power spectral density function (PSD) and the structure function (SF), are reviewed. Caveats associated with identification of quasi-periodic oscillations (QPOs) in the presence of red-noise variability are also discussed. A central point of this paper is to make all readers aware that there already exist good references out there for determining the statistical significance of claims of characteristic variability time scales.

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