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Astronomy · L5 · From Millisecond Pulsar Timing to the Nanohertz Gravitational-Wave Background

The detection pipeline from monitoring millisecond pulsars to confirming a stochastic gravitational-wave background via the Hellings-Downs correlation.

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Millisecond pulsars monitoredfor years to decadesTimes of arrival fit to atiming model: spin, astrometry,binary orbit, dispersion measureTiming residuals extractedCross-correlate residualsbetween many pulsar pairsAngular correlation matchesthe Hellings-Downs curve?Stochastic gravitational-wavebackground confirmedConsistent with uncorrelatednoise or systematicsYesNo

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