{"paper":{"title":"Pegasus IV: Discovery and Spectroscopic Confirmation of an Ultra-Faint Dwarf Galaxy in the Constellation Pegasus","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"A. B. Pace, A. Drlica-Wagner, A. E. Miller, A. H. Riley, A. K. Vivas, A. P. Ji, A. Zenteno (DELVE Collaboration), B. Mutlu-Pakdil, C. E. Mart{\\i}nez-Vazquez, C. R. Bom, D. Carollo, D. Erkal, D. Hernandez-Lang, D. J. James, D. J. Sand, D. Mart{\\i}nez-Delgado, E. J. Tollerud, G. S. Stringfellow, J. A. Carballo-Bello, J. D. Sakowska, J. D. Simon, J. L. Carlin, J. L. Nilo Castellon, K. A. G. Olsen, N. E. D. Noel, P. S. Ferguson, R. R. Munoz, S. Mau, T. S. Li, V. Manwadkar, W. Cerny, Y. Choi","submitted_at":"2022-03-22T14:49:14Z","abstract_excerpt":"We report the discovery of Pegasus IV, an ultra-faint dwarf galaxy found in archival data from the Dark Energy Camera processed by the DECam Local Volume Exploration Survey. Pegasus IV is a compact, ultra-faint stellar system ($r_{1/2} = 41^{+8}_{-6}$ pc; $M_V = -4.25 \\pm 0.2$ mag) located at a heliocentric distance of $90^{+4}_{-6}$ kpc. Based on spectra of seven non-variable member stars observed with Magellan/IMACS, we confidently resolve Pegasus IV's velocity dispersion, measuring $\\sigma_{v} = 3.3^{+1.7}_{-1.1} \\text{ km s}^{-1}$ (after excluding three velocity outliers); this implies a m"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2203.11788","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/2203.11788/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"}