{"paper":{"title":"The HST large programme on $\\omega$ Centauri -- III. Absolute proper motion","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.SR"],"primary_cat":"astro-ph.GA","authors_text":"A. Bellini, A. F. Marino, A. J. Burgasser, A. P. Milone, B. Pichardo, D. Apai, E. Moreno, J. Anderson, J. G. Fern\\'andez-Trincado, J. M. Rees, L. L. Watkins, L. R. Bedin, M. Libralato, R. P. van der Marel","submitted_at":"2018-01-04T19:00:09Z","abstract_excerpt":"In this paper we report a new estimate of the absolute proper motion (PM) of the globular cluster NGC 5139 ($\\omega$ Cen) as part of the HST large program GO-14118+14662. We analyzed a field 17 arcmin South-West of the center of $\\omega$ Cen and computed PMs with an epoch span of $\\sim$15.1 years. We employed 45 background galaxies to link our relative PMs to an absolute reference-frame system. The absolute PM of the cluster in our field is: $(\\mu_\\alpha \\cos\\delta , \\mu_\\delta) = (-3.341 \\pm 0.028 , -6.557 \\pm 0.043)$ mas yr$^{-1}$. Upon correction for the effects of viewing perspective and t"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1801.01502","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"}