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| Paper: |
Increasing the Scientific Return of Stellar Orbits at the Galactic Center |
| Volume: |
439, The Galactic Center: a Window to the Nuclear Environment of Disk Galaxies |
| Page: |
167 |
| Authors: |
Yelda, S.; Ghez, A. M.; Lu, J. R.; Do, T.; Clarkson, W.; Matthews, K. |
| Abstract: |
We report a factor of ∼3 improvement in Keck Laser Guide Star Adaptive
Optics (LGSAO) astrometric
measurements of stars near the Galaxy's supermassive black hole (SMBH).
By carrying out a systematic study of M92, we have
produced a more accurate model for the camera's optical
distortion. Updating our measurements with this model, and accounting for
differential atmospheric refraction, we obtain estimates of the SMBH properties
that are a factor of ∼2 more precise, and most notably, increase
the likelihood that the black hole is at rest with respect to the nuclear star
cluster. These improvements have also allowed us to extend the radius
to which stellar orbital parameter estimates are possible by a factor of 2. |
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