Spectroscopic Target Selection in the Sloan Digital Sky Survey: The Quasar Sample

@article{Richards2002SpectroscopicTS,
  title={Spectroscopic Target Selection in the Sloan Digital Sky Survey: The Quasar Sample},
  author={Gordon T. Richards and Xiaohui Fan and Heidi Jo Newberg and Michael A. Strauss and Daniel E. vanden Berk and Donald P. Schneider and Brian Yanny and Adam Boucher and Scott M. Burles and Joshua A. Frieman and James E. Gunn and Patrick B. Hall and Željko Ivezi{\'c} and S. Kent and J Loveday and Robert H. Lupton and Constance M. Rockosi and David J. Schlegel and Chris Stoughton and Mark SubbaRao and Donald G. York},
  journal={The Astronomical Journal},
  year={2002},
  volume={123},
  pages={2945-2975}
}
We describe the algorithm for selecting quasar candidates for optical spectroscopy in the Sloan Digital Sky Survey. Quasar candidates are selected via their nonstellar colors in ugriz broadband photometry and by matching unresolved sources to the FIRST radio catalogs. The automated algorithm is sensitive to quasars at all redshifts lower than z ~ 5.8. Extended sources are also targeted as low-redshift quasar candidates in order to investigate the evolution of active galactic nuclei (AGNs) at… 
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