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HSTPROMO Internal Proper Motion Kinematics of Dwarf Spheroidal Galaxies: II. Velocity Anisotropy and Dark Matter Cusp Slope of Sculptor
Eduardo Vitral, Roeland P. van der Marel, Sangmo Tony Sohn +8
We analyze three epochs of HST imaging over 20 years for the Sculptor dwarf spheroidal galaxy, measuring precise proper motions for 119 stars and combining them with 1760 existing…
Shapes of dark matter haloes with discrete globular cluster dynamics: The example of NGC 5128 (Centaurus A)
Tadeja Veršič, Marina Rejkuba, Magda Arnaboldi +7
Within the CDM cosmology, dark matter haloes are expected to deviate from spherical symmetry. Constraining the halo shapes at large galactocentric distances is challenging due t…
The Mass of the Large Magellanic Cloud from the Three-Dimensional Kinematics of its Globular Clusters
Laura L. Watkins, Roeland P. van der Marel, Paul Bennet
We estimate the mass of the Large Magellanic Cloud (LMC) using the kinematics of 30 LMC globular clusters (GCs). We combine proper motions (PMs) measured with HST, Gaia, or a combi…
Proper Motions and Orbits of Distant Local Group Dwarf Galaxies from a combination of Gaia and Hubble Data
Paul Bennet, Ekta Patel, Sangmo Tony Sohn +12
We have determined the proper motions (PMs) of 12 dwarf galaxies in the Local Group (LG), ranging from the outer Milky Way (MW) halo to the edge of the LG. We used HST as the first…
BP3M: Bayesian Positions, Parallaxes, and Proper Motions derived from the Hubble Space Telescope and Gaia data
Kevin A. McKinnon, Andrés del Pino, Constance M. Rockosi +9
We present a hierarchical Bayesian pipeline, BP3M, that measures positions, parallaxes, and proper motions (PMs) for cross-matched sources between Hubble~Space~Telescope (HST) imag…
Total mass slopes and enclosed mass constrained by globular cluster system dynamics
Tadeja Veršič, Sabine Thater, Glenn van de Ven +4
The goal of this work is to probe the total mass distribution of early-type galaxies with globular clusters (GCs) as kinematic tracers, by constraining the parameters of the profil…
JWST-TST Proper Motions: I. High-Precision NIRISS Calibration and Large Magellanic Cloud Kinematics
M. Libralato, A. Bellini, R. P. van der Marel +27
We develop and disseminate effective point-spread functions and geometric-distortion solutions for high-precision astrometry and photometry with the JWST NIRISS instrument. We corr…
Dynamics in the outskirts of four Milky Way globular clusters: it's the tides that dominate
Zhen Wan, Anthony D. Arnold, William H. Oliver +17
We present the results of a spectroscopic survey of the outskirts of 4 globular clusters -- NGC 1261, NGC 4590, NGC 1904, and NGC 1851 -- covering targets within 1 degree from the…
A Deep View into the Nucleus of the Sagittarius Dwarf Spheroidal Galaxy with MUSE. III. Discrete multi-component population-dynamical models based on the Jeans equations
Nikolay Kacharov, Mayte Alfaro-Cuello, Nadine Neumayer +12
We present comprehensive multi-component dynamical models of M54 (NGC6715), the nuclear star cluster of the Sagittarius dwarf galaxy (Sgr), which is undergoing a tidal disruption i…
Kinematic Structure of the Large Magellanic Cloud Globular Cluster System from Gaia eDR3 and Hubble Space Telescope Proper Motions
Paul Bennet, Mayte Alfaro-Cuello, Andrés del Pino +3
We have determined bulk proper motions (PMs) for 31 LMC GCs from Gaia eDR3 and Hubble Space Telescope data using multiple independent analysis techniques. Combined with literature…
Hubble Space Telescope Proper Motion (HSTPROMO) Catalogs of Galactic Globular Clusters. VII. Energy Equipartition
Laura L. Watkins, Roeland P. van der Marel, Mattia Libralato +3
We examine the degree of energy equipartition in 9 Galactic globular clusters using proper motions measured with the Hubble Space Telescope. For most clusters in the sample, this i…
GaiaHub: A method for combining data from the Gaia and Hubble space telescopes to derive improved proper motions for faint stars
Andrés del Pino, Mattia Libralato, Roeland P. van der Marel +6
We present GaiaHub, a publicly available tool that combines measurements with () archival images to derive proper motions (PMs). It increas…
Internal rotation of Milky Way dwarf spheroidal satellites with Early Data Release 3
Alberto Manuel Martínez-García, Andrés del Pino, Antonio Aparicio +2
We present an analysis of the kinematics of 14 satellites of the Milky Way (MW). We use proper motions (PMs) from the Early Data Release 3 (EDR3) and line-of-sight velocitie…
Hunting for intermediate-mass black holes in globular clusters: an astrometric study of NGC 6441
Maximilian Häberle, Mattia Libralato, Andrea Bellini +6
We present an astrometric study of the proper motions (PMs) in the core of the globular cluster NGC 6441. The core of this cluster has a high density and observations with current…
Disentangling the formation history of galaxies via population-orbit superposition: method validation
Ling Zhu, Glenn van de Ven, Ryan Leaman +9
We present population-orbit superposition models for external galaxies based on Schwarzschild's orbit-superposition method, by tagging the orbits with age and metallicity. The mode…
Imprints of Evolution on the Internal Kinematics of Globular Clusters
Laura L. Watkins, Roeland P. van der Marel, Andrea Bellini +2
Globular clusters are collisional systems, meaning that the stars inside them interact on timescales much shorter than the age of the Universe. These frequent interactions transfer…
Hunting for the Dark Matter Wake Induced by the Large Magellanic Cloud
Nicolas Garavito-Camargo, Gurtina Besla, Chervin F. P Laporte +3
Satellite galaxies are predicted to generate gravitational density wakes as they orbit within the dark matter (DM) halos of their hosts, causing their orbits to decay over time. Th…
Globular cluster number density profiles using Gaia DR2
T. J. L. de Boer, M. Gieles, E. Balbinot +4
Using data from Gaia DR2, we study the radial number density profiles of the Galactic globular cluster sample. Proper motions are used for accurate membership selection, especially…
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…
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…
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…