Three quasi-stellar objects acting as strong gravitational lenses

@article{Courbin2012ThreeQO,
  title={Three quasi-stellar objects acting as strong gravitational lenses},
  author={Fr{\'e}d{\'e}ric Courbin and C{\'e}cile Faure and S. George Djorgovski and F. R{\'e}rat and M. Tewes and Georges Meylan and Daniel Stern and Ashish A. Mahabal and T. A. Boroson and Rathore Dheeraj and Dominique Sluse},
  journal={Astronomy and Astrophysics},
  year={2012},
  volume={540}
}
We report the discovery of three new cases of quasi-stellar objects (QSOs) acting as strong gravitational lenses on background emission line galaxies: SDSS J0827+5224 (z_(QSO) = 0.293, z_s = 0.412), SDSS J0919+2720 (z_(QSO) = 0.209, z_s = 0.558), SDSS J1005+4016 (z_(QSO) = 0.230, z_s = 0.441). The selection was carried out using a sample of 22,298 SDSS spectra displaying at least four emission lines at a redshift beyond that of the foreground QSO. The lensing nature is confirmed from Keck… 

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