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Title: A Survey of z > 5.7 Quasars in the Sloan Digital Sky Survey IV: Discovery of Seven Additional Quasars

Journal Article · · The Astronomical Journal, vol. 131, no. 3, March 1, 2006, pp. 1203-1209
DOI:https://doi.org/10.1086/500296· OSTI ID:895080
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The authors 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 troughs in Ly{alpha}. These troughs are narrower than those observed among quasars at z > 6.2 and do not have complete Ly{beta} absorption.

Research Organization:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
W-7405-ENG-48
OSTI ID:
895080
Report Number(s):
UCRL-JRNL-219402; TRN: US200702%%601
Journal Information:
The Astronomical Journal, vol. 131, no. 3, March 1, 2006, pp. 1203-1209, Journal Name: The Astronomical Journal, vol. 131, no. 3, March 1, 2006, pp. 1203-1209
Country of Publication:
United States
Language:
English

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71 CLASSICAL AND QUANTUM MECHANICS
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99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
ABSORPTION
QUASARS
SKY