4.6 Article

SIX MORE QUASARS AT REDSHIFT 6 DISCOVERED BY THE CANADA-FRANCE HIGH-z QUASAR SURVEY

Journal

ASTRONOMICAL JOURNAL
Volume 137, Issue 3, Pages 3541-3547

Publisher

IOP PUBLISHING LTD
DOI: 10.1088/0004-6256/137/3/3541

Keywords

cosmology: observations; quasars: emission lines; quasars: general

Funding

  1. Gemini [GS-2007A-Q-24, GS-2007B-Q-15]
  2. National Science Foundation (United States)
  3. Particle Physics and Astronomy Research Council (United Kingdom)
  4. National Research Council (Canada)
  5. CONICYT (Chile)
  6. Australian Research Council (Australia)
  7. CNPq (Brazil)
  8. CONICET (Argentina)

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We present imaging and spectroscopic observations for six quasars at z >= 5.9 discovered by the Canada-France High-z Quasar Survey (CFHQS). The CFHQS contains subsurveys with a range of flux and area combinations to sample a wide range of quasar luminosities at z similar to 6. The new quasars have luminosities 10-75 times lower than the most luminous Sloan Digital Sky Survey quasars at this redshift. The least luminous quasar, CFHQS J0216-0455 at z = 6.01, has absolute magnitude M(1450) = -22.21, well below the likely break in the luminosity function. This quasar is not detected in a deep XMM-Newton survey showing that optical selection is still a very efficient tool for finding high-redshift quasars.

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