{"paper":{"title":"Proper Motions of Ionized Gas at the Galactic Center: Evidence for Unbound Orbiting Gas","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"D.A. Roberts, F. Yusef-Zadeh, J. Biretta","submitted_at":"1998-03-19T18:14:26Z","abstract_excerpt":"We present radio continuum observations of the spiral-shaped ionized feature (Sgr A West) within the inner pc of the Galactic center at three epochs spanning 1986 to 1995. The VLA A-configuration was used at $\\lambda$2cm (resolution of 0\\dasec1$\\times$0\\dasec2). We detect proper motions of a number of features in the Northern and Eastern Arms of Sgr A West including the ionized gas associated with IRS 13 with V(RA)= 113 \\pm 10, V(Dec)=150 \\pm15 km/s, IRS 2 with V(RA)= 122 \\pm 11, V(Dec)=24 \\pm 34 km/s and the Norther Arm V(RA)= 126 \\pm 30, V(Dec)=--207 \\pm 58 km/s. We also report the detection"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/9803231","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"}