Evidence for an Intermediate-mass Milky Way from Gaia DR2 Halo Globular Cluster Motions
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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
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1538-4357