A survey of z>5.7 quasars in the Sloan Digital Sky Survey.: IV.: Discovery of seven additional quasars

被引：358

作者：

Fan, XH ^{[1
]}

Strauss, MA

Richards, GT

Hennawi, JF

Becker, RH

White, RL

Diamond-Stanic, AM

Donley, JL

Jiang, LH

Kim, JS

Vestergaard, M

Young, JE

Gunn, JE

Lupton, RH

Knapp, GR

Schneider, DP

Brandt, WN

Bahcall, NA

Barentine, JC

Brinkmann, J

Brewington, HJ

Fukugita, M

Harvanek, M

Kleinman, SJ

Krzesinski, J

Long, D

Neilsen, EH

Nitta, A

Snedden, SA

Voges, W

机构：

[1] Univ Arizona, Steward Observ, Tucson, AZ 85721 USA

[2] Princeton Univ Observ, Princeton, NJ 08544 USA

[3] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA

[4] Univ Calif Davis, Dept Phys, Davis, CA 95616 USA

[5] Lawrence Livermore Natl Lab, Inst Geophys & Planetary Sci, Livermore, CA 94550 USA

[6] Space Telescope Sci Inst, Baltimore, MD 21218 USA

[7] Penn State Univ, Dept Astron & Astrophys, University Pk, PA 16802 USA

[8] Apache Point Observ, Sunspot, NM 88349 USA

[9] Univ Tokyo, Inst Cosm Ray Res, Tanashi, Tokyo 1888502, Japan

[10] Cracow Pedagog Univ, Mt Suhora Observ, PL-30084 Krakow, Poland

[11] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA

[12] Max Planck Inst Extraterr Phys, D-85750 Garching, Germany

来源：

ASTRONOMICAL JOURNAL | 2006年 / 131卷 / 03期

关键词：

quasars : absorption lines; quasars : emission lines; quasars : general;

D O I：

10.1086/500296

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present the discovery of seven quasars at z > 5.7, selected from similar to 2000 deg(2) of multicolor imaging data of the Sloan Digital Sky Survey. 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 the Ly alpha+N v 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 than the complete Gunn-Peterson absorption troughs observed among quasars at z > 6.2 and do not have complete Ly alpha absorption.

引用

页码：1203 / 1209

页数：7

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A survey of z&gt;5.7 quasars in the Sloan Digital Sky Survey.: IV.: Discovery of seven additional quasars

A survey of z>5.7 quasars in the Sloan Digital Sky Survey.: IV.: Discovery of seven additional quasars