# 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 106 Citations #### Figures and Tables from this paper The milky way total mass profile as inferred from Gaia DR2 We determine the Milky Way (MW) mass profile inferred from fitting physically motivated models to the Gaia DR2 Galactic rotation curve and other data. 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Mass and shape of the Milky Way’s dark matter halo with globular clusters from Gaia and Hubble
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Aims. We estimate the mass of the inner (< 20 kpc) Milky Way and the axis ratio of its inner dark matter halo using globular clusters as tracers. At the same time, we constrain the distribution inExpand
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Here we present a kinematic study of the Galactic halo out to a radius of ∼ 60 kpc, using 4664 blue horizontal branch (BHB) stars selected from the SDSS/SEGUE survey, to determine key dynamicalExpand
Absolute HST Proper Motion (HSTPROMO) Catalog of Distant Milky Way Globular Clusters: Three-dimensional Systemic Velocities and the Milky Way Mass
We present Hubble Space Telescope (HST) absolute proper motion (PM) measurements for 20 globular cluster (GCs) in the Milky Way (MW) halo spanning a Galactocentric distance (R_GC) range from ~10 toExpand
Absolute HST Proper Motion (HSTPROMO) of Distant Milky Way Globular Clusters: Galactocentric Space Velocities and the Milky Way Mass
We present Hubble Space Telescope (HST) absolute proper motion (PM) measurements for 20 globular clusters (GCs) in the Milky Way (MW) halo at Galactocentric distances RGC ≈ 10–100 kpc, with medianExpand