{"paper":{"title":"Discovery of two quasars at $z=5$ from the OGLE Survey","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"A. P. Ji, A. Rau, A. Udalski, D. M. Skowron, Eduardo Ba\\~nados, I. Soszy\\'nski, J. Greiner, J. Skowron, K. Rybicki, K. Ulaczyk, {\\L}. Wyrzykowski, M. Gromadzki, M. K. Szyma\\'nski, N. Morrell, P. Iwanek, P. Mr\\'oz, P. Pietrukowicz, R. Poleski, Szymon Koz{\\l}owski","submitted_at":"2018-10-19T18:00:01Z","abstract_excerpt":"We have used deep Optical Gravitational Lensing Experiment (OGLE-IV) images ($V \\lesssim 23$ mag, $I \\lesssim 23$ mag at $3\\sigma$) of the Magellanic System, encompassing an area of $\\sim$670 deg$^2$, to perform a search for high-$z$ quasar candidates. We combined the optical OGLE data with the mid-IR Wide-field Infrared Survey Explorer (WISE) 3.4/4.6/12 $\\mu$m data, and devised a multi-color selection procedure. We have identified 33 promising sources and then spectroscopically observed the two most variable ones. We report the discovery of two high-$z$ quasars, OGLE J015531-752807 at a redsh"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1810.08622","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"}