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The Proper Motion of Sagittarius A*. III. The Case for a Supermassive Black Hole
Abstract We report measurements with the Very Long Baseline Array of the proper motion of Sgr A* relative to two extragalactic radio sources spanning 18 yr. The apparent motion of Sgr A* is −6.411 ± 0.008 mas yr −1 along the Galactic plane and −0.219 ± 0.007 mas yr −1 …