The M31 Velocity Vector. I. Hubble Space Telescope Proper-motion Measurements

@article{Sohn2012TheMV,
  title={The M31 Velocity Vector. I. Hubble Space Telescope Proper-motion Measurements},
  author={Sangmo Tony Sohn and Jay Anderson and Roeland van der Marel},
  journal={The Astrophysical Journal},
  year={2012},
  volume={753},
  pages={7}
}
We present the first proper-motion (PM) measurements for the galaxy M31. We obtained new V-band imaging data with the Hubble Space Telescope ACS/WFC and the WFC3/UVIS instruments of three fields: a spheroid field near the minor axis, an outer disk field along the major axis, and a field on the Giant Southern Stream. The data provide five to seven year time baselines with respect to pre-existing deep first-epoch observations of the same fields. We measure the positions of thousands of M31 stars… Expand
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