The Why & How of X-Ray Timing - HEASARC - NASA
The Why & How of X-Ray Timing - HEASARC - NASA
The Why & How of X-Ray Timing - HEASARC - NASA
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Power Spectrum Statistics• Any form <strong>of</strong> noise willcontribute to the PDS,including Poisson(counting) noise• Distributed as χ 2 with 2degrees <strong>of</strong> freedom (d.o.f.)for the Leahy normalization• Good—Hypothesis testingused in, e.g., spectroscopyalso works for a PDS• Bad —mean value is 2,variance is 4! Typical noise measurementis 2±2• Adding more lightcurvepoints won’t help: makesmore finely spacedfrequencies
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