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dc.contributor.authorVaughan, Simon A.en_GB
dc.identifier.citationAstronomy and Astrophysics, 2005, 431, pp.391-403.en_GB
dc.description.abstractWe demonstrate a simple method for testing the significance of peaks in the periodogram of red noise data. The procedure was designed to test for spurious periodicities in X-ray light curves of active galaxies, but can be used quite generally to test for periodic components against a background noise spectrum assumed to have a power law shape. The method provides a simple and fast test of the significance of candidate periodic signals in short, well-sampled time series such as those obtained from XMM-Newton observations of Seyfert galaxies, without the need for Monte Carlo simulations. A full account is made of the number of trials and the uncertainties inherent to the model fitting. Ignoring these subtle effects can lead to substantially overestimated significances. These difficulties motivate us to demand high standards of detection (minimum > 99.9 per cent confidence) for periodicities in sources that normally show red noise spectra. The method also provides a simple means to estimate the power spectral index, which may be an interesting parameter itself, regardless of the presence/absence of periodicities.-
dc.publisherEDP Sciences-
dc.rights© The European Southern Observatory (ESO) 2005. Deposited with permission of the publisher.-
dc.subjectmethods: data analysis-
dc.subjectmethods: statistical-
dc.subjectX-rays: general-
dc.subjectX-rays: galaxies-
dc.titleA simple test for periodic signals in red noiseen_GB
dc.description.versionPublisher version-
dc.relation.raeRAE 2007-
dc.relation.deptX-ray and Observational Astronomy-
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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