Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-10-09
Astronomy and Astrophysics
Astrophysics
4 pages, 4 figures, accepted for publication in ApJL
Scientific paper
10.1086/338252
We discuss methods to compute significance levels for the existence of quasi-periodic oscillations (QPOs) in Active Galactic Nuclei (AGN) which take the red-noise character of the X-ray lightcurves of these objects into account. Applying epoch folding and periodogram analysis to the XMM-Newton observation of the Seyfert galaxy Mrk 766, a possible QPO at a timescale of 4200s has been reported. Our computation of the significance of this QPO, however, shows that the 4200s peak is not significant at the 95% level. We conclude that the 4200s feature is an artifact of the red-noise process and not the result of a physical process within the Active Galactic Nuclei.
Benlloch Sara
Edelson Richard
Staubert Rüdiger
Wilms Joern
Yaqoob Tahir
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