Evidence for an Intermediate-Mass Milky Way from Gaia DR2 Halo Globular Cluster Motions

  title={Evidence for an Intermediate-Mass Milky Way from Gaia DR2 Halo Globular Cluster Motions},
  author={L. L. Watkins and R. Marel and S. Sohn and N. W. E. STScI and Jhu and Cambridge},
  journal={arXiv: Astrophysics of Galaxies},
  • L. L. Watkins, R. Marel, +3 authors Cambridge
  • Published 2018
  • Physics
  • arXiv: Astrophysics of Galaxies
  • We estimate the mass of the Milky Way (MW) within 21.1 kpc using the kinematics of halo globular clusters (GCs) determined by Gaia. The second Gaia data release (DR2) contained a catalogue of absolute proper motions (PMs) for a set of Galactic GCs and satellite galaxies measured using Gaia DR2 data. We select from the catalogue only halo GCs, identifying a total of 34 GCs spanning $2.0 < r < 21.1$ kpc, and use their 3D kinematics to estimate the anisotropy over this range to be $\beta = 0.46… CONTINUE READING
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