Fewer supermassive binary black holes in pulsar timing array observations

Goncharov, Boris; Sardana, Shubhit; Sesana, A.; Antoniadis, J.; Chalumeau, A.; Champion, D.; Chen, S.; Keane, E. F.; Shaifullah, G.; Speri, L.

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Fewer supermassive binary black holes in pulsar timing array observations

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Goncharov, Boris
Observational Relativity and Cosmology, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

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Goncharov, B., Sardana, S., Sesana, A., Antoniadis, J., Chalumeau, A., Champion, D., et al. (in preparation). Fewer supermassive binary black holes in pulsar timing array observations.

Cite as: https://hdl.handle.net/21.11116/0000-000F-D839-E

Abstract

We reanalyse the second data release of the European Pulsar Timing Array
(EPTA) using an observationally-driven model for ensemble properties of pulsar
noise. We show that the revised gravitational wave background properties are in
better agreement with theoretical expectations for the strain spectrum. Our
improved model for ensemble pulsar noise properties reduces a systematic error
at $1\sigma$ level and increases Bayesian odds of Hellings-Downs correlations
by $\sim 10\%$.