Six more quasars at redshift 6 discovered by the Canada-France High-z Quasar Survey

Details Six more quasars at redshift 6 discovered by the Canada-France High-z Quasar Survey Six more quasars at redshift 6 discovered by the Canada-France High-z Quasar Survey

2009-01-05

arxiv.org/abs/0901.0565v1

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

7 pages, 4 figures, AJ, in press

Scientific paper

10.1088/0004-6256/137/3/3541

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 sub-surveys with a range of flux and area combinations to sample a wide range of quasar luminosities at z~6. The new quasars have luminosities 10 to 75 times lower than the most luminous SDSS 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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