{"paper":{"title":"A Survey of z>5.7 Quasars in the Sloan Digital Sky Survey IV: Discovery of Seven Additional Quasars","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"Aleksandar M. Diamond-Stanic, Atsuko Nitta, Dan Long, Donald P. Schneider, Eric H. N eilsen, Gillian R. Knapp, Gordon T. Richards, Howard J. Brewington, James E. Gunn, Jason E. Young, J. Brinkmann, J. C. Barentine, Jennifer L. D onley, Joseph F. Hennawi, Jr., J. Serena Kim, Jurek Krzesinski, Linhua Jiang, Marianne Vestergaard, Masataka F ukugita, Michael A. Strauss, Michael Harvanek, Neta A. Bahcall, Richard L. White, Robert H. Becker, Robert H. Lupton, S. J. Kleinman, Stephanie A. Snedden, W. N. Brandt, Wolfgang Voges, Xiaohui Fan","submitted_at":"2005-12-04T16:34:18Z","abstract_excerpt":"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 gravitat"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0512080","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}