Journal article
A Survey of z>5.7 Quasars in the Sloan Digital Sky Survey II: Discovery of Three Additional Quasars at z>6
The Astronomical journal, v 125(4), pp 1649-1659
08 Jan 2003
Abstract
Astron.J.125:1649,2003 We present the discovery of three new quasars at z>6 in 1300 deg^2 of SDSS
imaging data, J114816.64+525150.3 (z=6.43), J104845.05+463718.3 (z=6.23) and
J163033.90+401209.6 (z=6.05). The first two objects have weak Ly alpha emission
lines; their redshifts are determined from the positions of the Lyman break.
They are only accurate to 0.05 and could be affected by the presence of broad
absorption line systems. The last object has a Ly alpha strength more typical
of lower redshift quasars. Based on a sample of six quasars at z>5.7 that cover
2870 deg^2 presented in this paper and in Paper I, we estimate the comoving
density of luminous quasars at z 6 and M_{1450} < -26.8 to be (8 +/-
3)x10^{-10} Mpc^{-3} (for H_0 = 50 km/s/Mpc, Omega = 1). HST imaging of two
z>5.7 quasars and high-resolution ground-based images (seeing 0.4'') of three
additional z>5.7 quasars show that none of them is gravitationally lensed. The
luminosity distribution of the high-redshfit quasar sample suggests the bright
end slope of the quasar luminosity function at z 6 is shallower than Psi
L^{-3.5} (2-sigma), consistent with the absence of strongly lensed objects.
Metrics
Details
- Title
- A Survey of z>5.7 Quasars in the Sloan Digital Sky Survey II: Discovery of Three Additional Quasars at z>6
- Creators
- Xiaohui Fan - Institute for Advanced StudyMichael A Strauss - Princeton UniversityDonald P Schneider - Pennsylvania State UniversityRobert H Becker - Lawrence Livermore National LaboratoryRichard L White - Space Telescope Science InstituteZoltan Haiman - Princeton UniversityMichael Gregg - Lawrence Livermore National LaboratoryLaura Pentericci - Max Planck SocietyEva K GrebeVijay K Narayanan - Princeton UniversityYeong-Shang Loh - Princeton UniversityGordon T Richards - Princeton UniversityJames E Gunn - Princeton UniversityRobert H Lupton - Princeton UniversityGillian R Knapp - Princeton UniversityZeljko Ivezic - Princeton UniversityW. N Brandt - Pennsylvania State University
- Publication Details
- The Astronomical journal, v 125(4), pp 1649-1659
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Physics
- Web of Science ID
- WOS:000181713100003
- Scopus ID
- 2-s2.0-0037644277
- Other Identifier
- 991019201512004721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Astronomy & Astrophysics