Discovery of Astrometric Accelerations by Dark Companions in the Globular Cluster ω Centauri
Imants Platais,
Johannes Sahlmann,
Léo Girardi
et al.
Abstract:We present results from the search for astrometric accelerations of stars in ω Centauri using 13 yr of regularly scheduled Hubble Space Telescope WFC3/UVIS calibration observations in the cluster core. The high-precision astrometry of ∼160,000 sources was searched for significant deviations from linear proper motion. This led to the discovery of four cluster members and one foreground field star with compelling acceleration patterns. We interpreted them as the result of the gravitational pull by an invisible c… Show more
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