Journal
ASTRONOMICAL JOURNAL
Volume 137, Issue 3, Pages 3541-3547Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-6256/137/3/3541
Keywords
cosmology: observations; quasars: emission lines; quasars: general
Categories
Funding
- Gemini [GS-2007A-Q-24, GS-2007B-Q-15]
- National Science Foundation (United States)
- Particle Physics and Astronomy Research Council (United Kingdom)
- National Research Council (Canada)
- CONICYT (Chile)
- Australian Research Council (Australia)
- CNPq (Brazil)
- 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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