First case of strong gravitational lensing by a QSO: SDSS J0013+1523 at z = 0.120

@article{Courbin2010FirstCO,
  title={First case of strong gravitational lensing by a QSO: SDSS J0013+1523 at z = 0.120},
  author={Fr{\'e}d{\'e}ric Courbin and M. Tewes and S. George Djorgovski and Dominique Sluse and Ashish A. Mahabal and F. R{\'e}rat and Germany Epfl and Switzerland. and Caltech and Usa and ARI-Heidelberg and H Germany},
  journal={Astronomy and Astrophysics},
  year={2010},
  volume={516}
}
We present the first case of strong gravitational lensing by a QSO: SDSS J0013+1523 at z = 0.120. The discovery is the result of a systematic search for emission lines redshifted behind QSOs, among 22 298 spectra of the SDSS data release 7. Apart from the z = 0.120 spectral features of the foreground QSO, the spectrum of SDSS J0013+1523 also displays the [O II] and Hβ emission lines and the [O III] doublet, all at the same redshift, z = 0.640. Using sharp Keck adaptive optics K-band images… 

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