{"paper":{"title":"The Proper Motion Field of the Small Magellanic Cloud: Kinematic Evidence for its Tidal Disruption","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Charles R. Alcock, C. S. Kochanek, Gurtina Besla, J. Anderson, Marla C. Geha, Nitya Kallivayalil, Paul Zivick, Roeland P. van der Marel, Sangmo Tony Sohn, Sean T. Linden, Szymon Koz{\\l}owski, Tobias K. Fritz","submitted_at":"2018-04-11T17:33:58Z","abstract_excerpt":"We present a new measurement of the systemic proper motion of the Small Magellanic Cloud (SMC), based on an expanded set of 30 fields containing background quasars and spanning a $\\sim$3 year baseline, using the \\textit{Hubble Space Telescope} (\\textit{HST}) Wide Field Camera 3. Combining this data with our previous 5 \\textit{HST} fields, and an additional 8 measurements from the \\textit{Gaia}-Tycho Astrometric Solution Catalog, brings us to a total of 43 SMC fields. We measure a systemic motion of $\\mu_{W}$ = $-0.82$ $\\pm$ 0.02 (random) $\\pm$ 0.10 (systematic) mas yr$^{-1}$ and $\\mu_{N}$ = $-"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1804.04110","kind":"arxiv","version":2},"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"}