The NANOGrav 11-year Data Set: Pulsar-timing Constraints On The Stochastic Gravitational-wave Background

@article{Arzoumanian2018TheN1,
  title={The NANOGrav 11-year Data Set: Pulsar-timing Constraints On The Stochastic Gravitational-wave Background},
  author={Zaven Arzoumanian and Paul T. Baker and Adam Brazier and Sarah Burke-Spolaor and Sydney JoAnne Chamberlin and Sourav Chatterjee and Brian John Christy and James M. Cordes and Neil J. Cornish and Fronefield Crawford and H. Thankful Cromartie and Kathryn Crowter and Megan E. DeCesar and Paul B. Demorest and Timothy Dolch and J. A. Ellis and Robert D. Ferdman and Elizabeth C. Ferrara and William M. Folkner and Emmanuel Fonseca and Nathan Garver-Daniels and Peter A. Gentile and Roland Haas and Jeffrey S. Hazboun and Eliu A. Huerta and K. Islo and G. Jones and M. L. Jones and David L. Kaplan and Victoria M. Kaspi and Michael T. Lam and T. Joseph W. Lazio and Lina Levin and A. N. Lommen and Duncan R. Lorimer and J. Luo and Ryan S. Lynch and Dustin R. Madison and Maura Mclaughlin and S. T. McWilliams and Chiara M. F. Mingarelli and Cherry Ng and David J. Nice and Ryan S. Park and Timothy T. Pennucci and Nihan S. Pol and Scott M. Ransom and Paul S. Ray and Alexander Rasskazov and Xavier Siemens and Joseph Simon and Ren{\'e}e Spiewak and Ingrid H. Stairs and Daniel R. Stinebring and Kevin Stovall and Joseph K. Swiggum and S. R. Taylor and Michele Vallisneri and Sarah J. Vigeland and W. W. Zhu},
  journal={The Astrophysical Journal},
  year={2018},
  volume={859},
  pages={47}
}
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… 
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We compute upper limits on the nanohertz-frequency isotropic stochastic gravitational wave background (GWB) using the 9 year data set from the North American Nanohertz Observatory for Gravitational
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