Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-01-12
Astrophys.J.648:405-410,2006
Astronomy and Astrophysics
Astrophysics
Comments: 16 pages, 5 figures, ApJ, in press
Scientific paper
10.1086/504279
Two disks of young stars have recently been discovered in the Galactic Center. The disks are rotating in the gravitational field of the central black hole at radii r=0.1-0.3 pc and thus open a new opportunity to measure the central mass. We find that the observed motion of stars in the clockwise disk implies M=4.3+/-0.5 million solar masses for the fiducial distance to the Galactic Center R_0=8 kpc and derive the scaling of M with R_0. As a tool for our estimate we use orbital roulette, a recently developed method. The method reconstructs the three-dimensional orbits of the disk stars and checks the randomness of their orbital phases. We also estimate the three-dimensional positions and orbital eccentricities of the clockwise-disk stars.
Beloborodov Andrei M.
Eisenhauer Frank
Genzel Reinhard
Gillessen Stefan
Levin Yan
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