Discovery of a Probable Physical Triple Quasar

@article{Djorgovski2007DiscoveryOA,
  title={Discovery of a Probable Physical Triple Quasar},
  author={S. George Djorgovski and Fr{\'e}d{\'e}ric Courbin and Georges Meylan and Dominique Sluse and D. J. Thompson and Ashish A. Mahabal and Eilat Glikman},
  journal={The Astrophysical Journal Letters},
  year={2007},
  volume={662},
  pages={L1 - L5}
}
We report the discovery of the first known probable case of a physical triple quasar. A previously known double system, QQ 1429-008 at z = 2.076, is shown to contain a third, fainter QSO component at the same redshift. Deep optical and IR imaging has failed to reveal a plausible lensing galaxy group or a cluster, and we are unable to construct any viable lensing model that could lead to the observed distribution of source positions and relative intensities of the three QSO image components… 

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