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Arzoumanian, Z., Baker, P. T., Blumer, H., Bécsy, B., Brazier, A., Brook, P. R., ... & NANOGrav Collaboration. (2020). The NANOGrav 12.5 yr data set: search for an isotropic stochastic gravitational-wave background. The Astrophysical journal letters, 905(2), L34.
Arzoumanian, Zaven, et al. "The NANOGrav 12.5 yr data set: search for an isotropic stochastic gravitational-wave background." The Astrophysical journal letters 905.2 (2020): L34.
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Z Arzoumanian, PT Baker, H Blumer… - The Astrophysical …, 2020 - iopscience.iop.org

The NANOGrav 12.5 yr data set: search for an isotropic stochastic gravitational-wave background.

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Excerpt

We search for an isotropic stochastic gravitational-wave background (GWB) in the 12.5 yr pulsar-timing data set collected by the North American Nanohertz Observatory for Gravitational Waves. Our analysis finds strong evidence of a stochastic process, modeled as a power law, with common amplitude and spectral slope across pulsars. Under our fiducial model, the Bayesian posterior of the amplitude for an f− 2/3 power-law spectrum, expressed as the characteristic GW strain, has median 1.92× 10− 15 and 5%–95% quantiles of 1.37 …

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