Quasar Clustering at 25 h−1 kpc from a Complete Sample of Binaries

@article{Myers2007QuasarCA,
  title={Quasar Clustering at 25 h−1 kpc from a Complete Sample of Binaries},
  author={Adam D. Myers and Gordon T. Richards and Robert J. Brunner and Donald P. Schneider and Natalie E. Strand and Patrick B. Hall and Jeff Blomquist and Donald G. York},
  journal={The Astrophysical Journal},
  year={2007},
  volume={678},
  pages={635 - 646}
}
We present spectroscopy of binary quasar candidates, with component separations of 3'' ⩽ Δ θ < 6'', selected from Data Release 4 of the Sloan Digital Sky Survey (SDSS DR4) using kernel density estimation (KDE). Of our 27 new quasar pair observations, 10 are binary quasars, which doubles the number of known g < 21 binaries with 3'' ⩽ Δ θ < 6'' separations. Several of our observed binaries are wide-separation lens candidates that merit additional higher resolution spectroscopy, as well as deep… 

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