ARE WE THERE YET? TIME TO DETECTION OF NANOHERTZ GRAVITATIONAL WAVES BASED ON PULSAR-TIMING ARRAY LIMITS

@article{Taylor2015AREWT,
  title={ARE WE THERE YET? TIME TO DETECTION OF NANOHERTZ GRAVITATIONAL WAVES BASED ON PULSAR-TIMING ARRAY LIMITS},
  author={S. R. Taylor and Michele Vallisneri and J. A. Ellis and Chiara M. F. Mingarelli and T. Joseph W. Lazio and R. van Haasteren},
  journal={The Astrophysical Journal Letters},
  year={2015},
  volume={819}
}
Decade-long timing observations of arrays of millisecond pulsars have placed highly constraining upper limits on the amplitude of the nanohertz gravitational-wave stochastic signal from the mergers of supermassive black hole binaries (∼10−15 strain at f = 1 yr−1). These limits suggest that binary merger rates have been overestimated, or that environmental influences from nuclear gas or stars accelerate orbital decay, reducing the gravitational-wave signal at the lowest, most sensitive… 
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