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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$^{-1}$. 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