Paper:	ALMA Astrometry of the IR Stars in the Vicinity of Sgr Aast
Volume:	528, New Horizons in Galactic Center Astronomy and Beyond
Page:	315
Authors:	Tsuboi, M.; Kitamura, Y.; Tsutsumi, T.; Miyawaki, R.; Miyoshi, M.; Miyazaki, A.
Abstract:	We observed Sagittarius A*(Sgr A*) and the surrounding area at 230 and 340 GHz with ALMA in the interval of 14 months to demonstrate the possibility of a new method of search for IMBHs in the Galactic center region. The angular resolutions are ∼0.''03 at 230 GHz and ∼0.''10 at 340 GHz, respectively. The well-known infrared objects including IRS16 cluster, IRS13E complex, IRS21 cluster and many independent IR stars have been first detected in the sub-mm continuum maps. After subtracting the effect for crowding stars by insufficient angular resolution, we determined the proper motions referencing for Sgr A* of these stars. The proper motions are almost consistent with results from previous observations.

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