The International Pulsar Timing Array project: using pulsars as a gravitational wave detector

@article{Hobbs2009TheIP,
  title={The International Pulsar Timing Array project: using pulsars as a gravitational wave detector},
  author={George Hobbs and Aaron J. Archibald and Zaven Arzoumanian and Donald Charles Backer and Matthew Bailes and N. D. Ramesh Bhat and Marta Burgay and Sarah Burke-Spolaor and David J. Champion and Ismael Cognard and W. A. Coles and James M. Cordes and Paul B. Demorest and Gregory Desvignes and Robert D. Ferdman and Lee Samuel Finn and Paulo C. C. Freire and M. E. Gonzalez and Jason W. T. Hessels and Aidan Hotan and G. Janssen and Fredrick A. Jenet and Axel Jessner and Christine A. Jordan and Victoria M. Kaspi and Michael Kramer and Vladislav I. Kondratiev and Joseph Lazio and Konstantinos Lazaridis and K J Lee and Yuri Levin and Andrea N. Lommen and Duncan R. Lorimer and Ryan S. Lynch and Andrew G. Lyne and Richard N. Manchester and Maura Mclaughlin and David J. Nice and Stefan Osłowski and Maura Pilia and Andrea Possenti and Mark B. Purver and Scott M. Ransom and John Reynolds and Sotiris Sanidas and John M. Sarkissian and Alberto Sesana and Ryan M. Shannon and Xavier Siemens and Ingrid H. Stairs and Ben W. Stappers and Daniel R. Stinebring and Gilles Theureau and R. van Haasteren and Willem van Straten and Joris P W Verbiest and D. R. B. Yardley and X. P. You},
  journal={Classical and Quantum Gravity},
  year={2009},
  volume={27},
  pages={084013}
}
The International Pulsar Timing Array project combines observations of pulsars from both northern and southern hemisphere observatories with the main aim of detecting ultra-low frequency (∼ 10−9–10−8 Hz) gravitational waves. Here we introduce the project, review the methods used to search for gravitational waves emitted from coalescing supermassive binary black-hole systems in the centres of merging galaxies and discuss the status of the project. 
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