Journal article
A survey of z > 5.7 quasars in the sloan digital sky survey. 4. discovery of seven additional quasars
Astron.J.131:1203-1209,2006
01 Dec 2005
Abstract
We present the discovery of seven quasars at z > 5.7, selected from {approx}2000 deg{sup 2} of multicolor imaging data of the Sloan Digital Sky Survey (SDSS). The new quasars have redshifts z from 5.79 to 6.13. Five are selected as part of a complete flux-limited sample in the SDSS Northern Galactic Cap; two have larger photometric errors and are not part of the complete sample. One of the new quasars, SDSS J1335+3533 (z = 5.93), exhibits no emission lines; the 3-{sigma} limit on the rest-frame equivalent width of Ly{alpha} + NV line is 5 {angstrom}. It is the highest redshift lineless quasar known, and could be a gravitational lensed galaxy, a BL Lac object or a new type of quasar. Two new z > 6 quasars, SDSS 1250+3130 (z = 6.13) and SDSS J1137+3549 (z = 6.01), show deep Gunn-Peterson absorption gaps in Ly{alpha}. These gaps are narrower the complete Gunn-Peterson absorption troughs observed among quasars at z > 6.2 and do not have complete Ly{beta} absorption.
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Details
- Title
- A survey of z > 5.7 quasars in the sloan digital sky survey. 4. discovery of seven additional quasars
- Creators
- Xiao-Hui FanMichael A StraussGordon T RichardsJoseph F HennawiRobert H BeckerRichard L WhiteAleksandar M Diamond-StanicJennifer L D onleyLin-Hua JiangJ Serena KimMarianne VestergaardJason E YoungJames E GunnRobert H LuptonGillian R KnappDonald P SchneiderW N BrandtNeta A BahcallJ C BarentineJ BrinkmannHoward J Brewington
- Publication Details
- Astron.J.131:1203-1209,2006
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Physics
- Identifiers
- 991019201381104721