A massive binary black-hole system in OJ 287 and a test of general relativity

@article{Valtonen2008AMB,
  title={A massive binary black-hole system in OJ 287 and a test of general relativity},
  author={Mauri J. Valtonen and Harry J. Lehto and Kim K. Nilsson and J. Heidt and Leo O. Takalo and Aimo Sillanp{\"a}{\"a} and Carolin Villforth and Mark Richard Kidger and G. T. Poyner and Tapio Pursimo and Stanislaw Zola and J.-H. Wu and X. Zhou and Kozo Sadakane and Marek Mateusz Drożdż and Dorota Kozieł and D Marchev and Waldemar Ogłoza and C. Porowski and Michał Siwak and Grzegorz Stachowski and Maciej J. Winiarski and V. P. Hentunen and Markku Nissinen and Alexios Liakos and S. S. Doğru},
  journal={Nature},
  year={2008},
  volume={452},
  pages={851-853}
}
Tests of Einstein’s general theory of relativity have mostly been carried out in weak gravitational fields where the space-time curvature effects are first-order deviations from Newton’s theory. Binary pulsars provide a means of probing the strong gravitational field around a neutron star, but strong-field effects may be best tested in systems containing black holes. Here we report such a test in a close binary system of two candidate black holes in the quasar OJ 287. This quasar shows quasi… 

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