Evidence for an Intermediate-mass Milky Way fromGaiaDR2 Halo Globular Cluster Motions

@article{Watkins2019EvidenceFA,
  title={Evidence for an Intermediate-mass Milky Way fromGaiaDR2 Halo Globular Cluster Motions},
  author={Laura L. Watkins and Roeland P. van der Marel and Sangmo Tony Sohn and N. Wyn Evans},
  journal={The Astrophysical Journal},
  year={2019}
}
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… Expand

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