Physics – Optics
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.1422y&link_type=abstract
American Astronomical Society, AAS Meeting #211, #14.22; Bulletin of the American Astronomical Society, Vol. 39, p.762
Physics
Optics
Scientific paper
We present new proper motion measurements of stars within a 1 pc x 1 pc region centered on our Galaxy's central black hole using diffraction-limited K-band images taken with the Laser Guide Star Adaptive Optics system on the W. M. Keck II 10 m telescope. Using the velocity dispersion to estimate mass, we find that at large radii, the enclosed mass is consistent with that inferred from stellar orbits much closer in. However, at smaller radii, the velocity dispersion under-predicts the mass of the black hole by a factor of two. Velocity dispersions in the plane of the sky for this sample suggest an inner hole in the old stellar population, in agreement with the findings of Figer et al. (2003) based on radial velocity work. This resolves the apparent discrepancy between the two methods.
Ghez Andrea M.
Lu Jianhua
Matthews Keith
Morris Marita
Trainor Ryan
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