# The NANOGrav 11 Year Data Set: Pulsar-timing constraints on the Stochastic Gravitational-wave Background

“The NANOGrav 11 Year Data Set: Pulsar-timing constraints on the Stochastic Gravitational-wave Background” (2024), by Zaven Arzoumanian et al. Physics and Astronomy research paper. Original abstract below, unchanged. No free PDF was found.

- Authors: Zaven Arzoumanian, P. T. Baker, Adam Brazier, Sarah Burke-Spolaor, S. J. Chamberlin, Shami Chatterjee, B. Christy, J. M. Cordes, Neil J. Cornish, Fronefield Crawford III et al.
- Published: January 1, 2024
- Field: Physics and Astronomy
- DOI: https://doi.org/10.25916/sut.26295832.v1
- Source: https://figshare.com/articles/journal_contribution/The_NANOGrav_11_Year_Data_Set_Pulsar-timing_constraints_on_the_Stochastic_Gravitational-wave_Background/26295832

## Abstract

We search for an isotropic stochastic gravitational-wave background (GWB) in the newly released 11 year data set from the North American Nanohertz Observatory for Gravitational Waves (NANOGrav). While we find no evidence for a GWB, we place constraints on a population of inspiraling supermassive black hole (SMBH) binaries, a network of decaying cosmic strings, and a primordial GWB. For the first time, we find that the GWB constraints are sensitive to the solar system ephemeris (SSE) model used and that SSE errors can mimic a GWB signal. We developed an approach that bridges systematic SSE differences, producing the first pulsar-timing array (PTA) constraints that are robust against SSE errors. We thus place a 95% upper limit on the GW-strain amplitude of A GWB

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