{"paper":{"title":"Spectroscopic classification of a complete sample of astrometrically-selected quasar candidates using Gaia DR2","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.HE"],"primary_cat":"astro-ph.GA","authors_text":"A. de Burgos, B. E. H. K. Arvedlund, B. Milvang-Jensen, C. Konstantopoulou, C. L. Steinhardt, C. R. Christiansen, E. H{\\o}g, I. B. McKenzie, J.-K. Krogager, J. P. U. Fynbo, K. A. Mosekj{\\ae}r, K. B. Kuszon, K. E. Heintz, L. Christensen, M. F. K. Paulsen, M. N. Sukstorf, P. D. Henriksen, P. Jakobsson, P. M{\\o}ller, S. J. Geier, S. K. K. {\\O}rgaard, S. N. Wilson, T. B. Hansen","submitted_at":"2020-10-12T18:01:05Z","abstract_excerpt":"Here we explore the efficiency and fidelity of a purely astrometric selection of quasars as point sources with zero proper motions in the {\\it Gaia} data release 2 (DR2). We have built a complete candidate sample including 104 Gaia-DR2 point sources brighter than $G<20$ mag within one degree of the north Galactic pole (NGP), all with proper motions consistent with zero within 2$\\sigma$ uncertainty. In addition to pre-existing spectra, we have secured long-slit spectroscopy of all the remaining candidates and find that all 104 stationary point sources in the field can be classified as either qu"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2010.05934","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2010.05934/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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"}