The Proper Motion of Sagittarius A*: III. The Case for a Supermassive Black Hole

13 Jan 2020 Reid M. J. Brunthaler A.

We report measurements with the Very Long Baseline Array of the proper motion of Sgr A* relative to two extragalactic radio sources spanning 18 years. The apparent motion of Sgr A* is -6.411 +/- 0.008 mas/yr along the Galactic plane and -0.219 +/- 0.007 mas/yr toward the North Galactic Pole... (read more)

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