{"paper":{"title":"The Most Massive Ultra-Compact Dwarf Galaxy in the Virgo Cluster","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"10, (10) PUC, 11, (11) FONDECYT, 12, (12) CAS-CONICYT, 13), (13) CASSACA, (14) NAOC, (15) CEA/IRFU/SAp, (16) SHAO), 2), (2) Shanghai Key Lab for PPC, (3) corresponding author, 4, (4) PKU, 5), (5) KIAA, (6) UCO/Lick, 7), (7) Texas Tech, (8) CWRU, (9) NRC-HIA, Chengze Liu (1, Elisa Toloba (6, Emily C. Cunningham (6), Eric W. Peng (3, Gregory Herczeg (5), Hong-Xin Zhang (14, J. Christopher Mihos (8), Jean-Charles Cuillandre (15), Joel Roediger (9), Jun Yin (16) ((1) SJTU, Karla Alamo-Mart\\'inez (10, Laura Ferrarese (9), Patrick C\\^ot\\'e (9), Puragra Guhathakurta (6), Rub\\'en S\\'anchez-Janssen (9), Stephen Gwyn (9), Sungsoon Lim (4, Thomas H. Puzia (10)","submitted_at":"2015-08-28T23:10:14Z","abstract_excerpt":"We report on the properties of the most massive ultra-compact dwarf galaxy (UCD) in the nearby Virgo Cluster of galaxies using imaging from the Next Generation Virgo Cluster Survey (NGVS) and spectroscopy from Keck/DEIMOS. This object (M59-UCD3) appears to be associated with the massive Virgo galaxy M59 (NGC 4621), has an integrated velocity dispersion of 78 km/s, a dynamical mass of $3.7\\times10^8 M_\\odot$, and an effective radius ($R_e$) of 25 pc. With an effective surface mass density of $9.4\\times10^{10} M_\\odot/kpc^2$, it is the densest galaxy in the local Universe discovered to date, sur"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1508.07373","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"}