The Position, Motion, and Mass of Sgr A*

Details The Position, Motion, and Mass of Sgr A* The Position, Motion, and Mass of Sgr A*

2003-04-04

arxiv.org/abs/astro-ph/0304095v1

Astron.Nachr. 324S1 (2003) 505-511

Astronomy and Astrophysics

Astrophysics

7 pages, 4 figures

Scientific paper

10.1002/asna.200385084

We report progress on measuring the position of Sgr A* on infrared images, placing limits on the motion of the central star cluster relative to Sgr A*, and measuring the proper motionof Sgr A* itself. The position of Sgr A* has been determined to within 10 mas on infrared images. To this accuracy, the gravitational source (sensed by stellar orbits) and the radiative source (Sgr A*) are coincident. Proper motions of four stars measured both in the infrared and radio indicate that the central star cluster moves with Sgr A* to within 70 km/s. Finally, combining stellar orbital information with an upper limit of 8 km/s for the intrinsic proper motion of Sgr A* (perpendicular to the Galactic plane), we place a lower limit on the mass of Sgr A* of 4 x 10^5 Msun.

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