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Mass modelling globular clusters in the Gaia era: a method comparison using mock data from an -body simulation of M4
Vincent Hénault-Brunet, Mark Gieles, Antonio Sollima +5
As we enter a golden age for studies of internal kinematics and dynamics of Galactic globular clusters (GCs), it is timely to assess the performance of modelling techniques in reco…
The internal rotation of globular clusters revealed by Gaia DR2
P. Bianchini, R. P. van der Marel, A. del Pino +5
Line-of-sight kinematic studies indicate that many Galactic globular clusters have a significant degree of internal rotation. However, three-dimensional kinematics from a combinati…
Hubble Space Telescope Proper motion (HSTPROMO) Catalogs of Galactic Globular Clusters. VI. Improved data reduction and internal-kinematic analysis of NGC 362
M. Libralato, A. Bellini, R. van der Marel +6
We present an improved data-reduction technique to obtain high-precision proper motions (PMs) of globular clusters using Hubble Space Telescope data. The new reduction is superior…
First Gaia Dynamics of the Andromeda System: DR2 Proper Motions, Orbits, and Rotation of M31 and M33
Roeland P. van der Marel, Mark A. Fardal, Sangmo Tony Sohn +5
The 3D velocities of M31 and M33 are important for understanding the evolution and cosmological context of the Local Group. Their most massive stars are detected by Gaia, and we us…
HST astrometry in the 30 Doradus region: II. Runaway stars from new proper motions in the Large Magellanic Cloud
I. Platais, D. J. Lennon, R. P. van der Marel +12
We present a catalog of relative proper motions for 368,787 stars in the 30 Doradus region of the Large Magellanic Cloud (LMC), based on a dedicated two-epoch survey with the Hubbl…
Evidence for an Intermediate-Mass Milky Way from Gaia DR2 Halo Globular Cluster Motions
Laura L. Watkins, Roeland P. van der Marel, Sangmo Tony Sohn +1
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 c…
Absolute HST Proper Motion (HSTPROMO) of Distant Milky Way Globular Clusters: Galactocentric Space Velocities and the Milky Way Mass
Sangmo Tony Sohn, Laura L. Watkins, Mark A. Fardal +4
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 $R_{\rm GC} \…
LBT/MODS spectroscopy of globular clusters in the irregular galaxy NGC 4449
F. Annibali, E. Morandi, L. L. Watkins +11
We present intermediate-resolution (R1000) spectra in the 3500-10,000 A range of 14 globular clusters in the magellanic irregular galaxy NGC 4449 acquired with the Mult…
The Astropy Project: Building an inclusive, open-science project and status of the v2.0 core package
The Astropy Collaboration, A. M. Price-Whelan, B. M. Sipőcz +134
The Astropy project supports and fosters the development of open-source and openly-developed Python packages that provide commonly-needed functionality to the astronomical communit…
The HST large programme on Centauri -- III. Absolute proper motion
M. Libralato, A. Bellini, L. R. Bedin +11
In this paper we report a new estimate of the absolute proper motion (PM) of the globular cluster NGC 5139 ( Cen) as part of the HST large program GO-14118+14662. We analyzed a…