The 15-year NANOGrav pulsar-timing dataset shows a stochastic gravitational-wave background with Hellings-Downs spatial correlations at 3-4 sigma significance.
Each point represents a draw η(k) from hd13/3 posterior, which is used to simulate δtsim,(k) and to compute both S/Ns
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The NANOGrav 15-year Data Set: Evidence for a Gravitational-Wave Background
The 15-year NANOGrav pulsar-timing dataset shows a stochastic gravitational-wave background with Hellings-Downs spatial correlations at 3-4 sigma significance.