DISCOVERY OF THREE z > 6.5 QUASARS IN THE VISTA KILO-DEGREE INFRARED GALAXY (VIKING) SURVEY

@article{Venemans2013DISCOVERYOT,
  title={DISCOVERY OF THREE z > 6.5 QUASARS IN THE VISTA KILO-DEGREE INFRARED GALAXY (VIKING) SURVEY},
  author={Bram P. Venemans and Joseph R. Findlay and William J. Sutherland and Gisella de Rosa and Richard G. McMahon and Robert A. Simcoe and Eduardo A. Gonz{\'a}lez-Solares and K. Kuijken and J. R. Lewis},
  journal={The Astrophysical Journal},
  year={2013},
  volume={779}
}
Studying quasars at the highest redshifts can constrain models of galaxy and black hole formation, and it also probes the intergalactic medium in the early universe. Optical surveys have to date discovered more than 60 quasars up to z ≃ 6.4, a limit set by the use of the z-band and CCD detectors. Only one z ≳ 6.4 quasar has been discovered, namely the z = 7.08 quasar ULAS J1120+0641, using near-infrared imaging. Here we report the discovery of three new z ≳ 6.4 quasars in 332 deg2 of the… 

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