The Absolute Proper Motion of Palomar 12: A Case for Tidal Capture from the Sagittarius Dwarf Spheroidal Galaxy

  title={The Absolute Proper Motion of Palomar 12: A Case for Tidal Capture from the Sagittarius Dwarf Spheroidal Galaxy},
  author={D. I. Dinescu and Steven R. Majewski and Terrence M. Girard and Kyle McC. Cudworth},
  journal={The Astronomical Journal},
  pages={1892 - 1905}
We have measured the absolute proper motion of the young globular cluster Pal 12 with respect to background galaxies, using plate material spanning a 40 yr time baseline, and measuring stars down to a magnitude V ∼ 22. The measured absolute proper motion has an uncertainty of 0.3 mas yr-1 in each coordinate. Pal 12's young age for a globular cluster led to the hypothesis that the cluster originated in the Large Magellanic Cloud (LMC) and was later captured by the Milky Way (Lin & Richer). Here… 

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