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A Survey of z>5.7 Quasars in the Sloan Digital Sky Survey IV

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningfagfællebedømt

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  • Xiaohui Fan
  • Michael A. Strauss
  • Gordon T. Richards
  • Joseph F. Hennawi
  • Robert H. Becker
  • Richard L. White
  • Aleksandar M. Diamond-Stanic
  • Jennifer L. D onley
  • Linhua Jiang
  • J. Serena Kim
  • Jason E. Young
  • James E. Gunn
  • Robert H. Lupton
  • Gillian R. Knapp
  • Donald P. Schneider
  • W. N. Brandt
  • Neta A. Bahcall
  • J. C. Barentine
  • J. Brinkmann
  • Howard J. Brewington
  • Masataka F ukugita
  • Michael Harvanek
  • S. J. Kleinman
  • Jurek Krzesinski
  • Dan Long
  • Jr Eric H. N eilsen
  • Atsuko Nitta
  • Stephanie A. Snedden
  • Wolfgang Voges
We present the discovery of seven quasars at z>5.7, selected from ~2000 deg^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 A. 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.
OriginalsprogEngelsk
Artikelnummer131
TidsskriftAstronomical Journal
Vol/bind131
Udgave nummer3
ISSN0004-6256
DOI
StatusUdgivet - 4 dec. 2005

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