{"paper":{"title":"Two bright z > 6 quasars from VST ATLAS and a new method of optical plus mid-infra-red colour selection","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO"],"primary_cat":"astro-ph.GA","authors_text":"A. C. Carnall, B. Chehade, E. Gonzalez-Solares, J. R. Findlay, M. Fumagalli, M. J. Irwin, M. Rauch, N. Metcalfe, T. Shanks","submitted_at":"2015-02-26T21:00:04Z","abstract_excerpt":"We present the discovery of two z > 6 quasars, selected as i band dropouts in the VST ATLAS survey. Our first quasar has redshift, z = 6.31 \\pm 0.03, z band magnitude, z_AB = 19.63 \\pm 0.08 and rest frame 1450A absolute magnitude, M_1450 = -27.8 \\pm 0.2, making it the joint second most luminous quasar known at z > 6. The second quasar has z = 6.02 \\pm 0.03, z_AB = 19.54 \\pm 0.08 and M_1450 = -27.0 \\pm 0.1. We also recover a z = 5.86 quasar discovered by Venemans et al. (2015, in prep.). To select our quasars we use a new 3D colour space, combining the ATLAS optical colours with mid-infra-red d"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1502.07748","kind":"arxiv","version":2},"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"}