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HSTPROMO Internal Proper Motion Kinematics of Dwarf Spheroidal Galaxies: I. Velocity Anisotropy and Dark Matter Cusp Slope of Draco
Eduardo Vitral, Roeland P. van der Marel, Sangmo Tony Sohn +8
We analyze four epochs of HST imaging over 18 years for the Draco dwarf spheroidal galaxy. We measure precise proper motions (PMs) for hundreds of stars and combine these with exis…
An elusive dark central mass in the globular cluster M4
Eduardo Vitral, Mattia Libralato, Kyle Kremer +4
Recent studies of nearby globular clusters have discovered excess dark mass in their cores, apparently in an extended distribution, and simulations indicate that this mass is compo…
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…
First observational evidence of a relation between globular clusters' internal rotation and stellar masses
M. Scalco, A. Livernois, E. Vesperini +3
Several observational studies have shown that many Galactic globular clusters (GCs) are characterised by internal rotation. Theoretical studies of the dynamical evolution of rotati…
The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters. XXIV. Differences in internal kinematics of multiple stellar populations
M. Libralato, E. Vesperini, A. Bellini +12
Our understanding of the kinematic properties of multiple stellar populations (mPOPs) in Galactic globular clusters (GCs) is still limited compared to what we know about their chem…
The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters. XXIII. Proper-motion catalogs and internal kinematics
M. Libralato, A. Bellini, E. Vesperini +17
A number of studies based on data collected by the () GO-13297 program "HST Legacy Survey of Galactic Globular Clusters: Shedding UV…
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…
Stellar graveyards: Clustering of compact objects in globular clusters NGC 3201 and NGC 6397
Eduardo Vitral, Kyle Kremer, Mattia Libralato +2
We analyse Gaia EDR3 and re-calibrated HST proper motion data from the core-collapsed and non core-collapsed globular clusters NGC 6397 and NGC 3201, respectively, with the Bayesia…
Relative Ages of Nine Inner Milky Way Globular Clusters from Proper Motion Cleaned Color-Magnitude Diagrams
Roger E. Cohen, Andrea Bellini, Luca Casagrande +3
Our picture of the age-metallicity relation for Milky Way globular clusters (MWGCs) is still highly incomplete, and the majority of MWGCs lack self-consistent age measurements. Her…
3D core kinematics of NGC6362: central rotation in a dynamically evolved globular cluster
E. Dalessandro, S. Raso, S. Kamann +4
We present a detailed 3D kinematic analysis of the central regions () of the low-mass and dynamically evolved galactic globular cluster NGC 6362. The study is based on data…
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…
The wide upper main sequence and main sequence turnoff of the ~ 800 Myr old star cluster NGC1831
Matteo Correnti, Paul Goudfrooij, Andrea Bellini +1
We present the analysis of the colour-magnitude diagram (CMD) morphology of the ~ 800 Myr old star cluster NGC1831 in the Large Magellanic Cloud, exploiting deep, high-resolution p…
Structure and Internal Kinematics of Nine Inner Milky Way Globular Clusters
Roger E. Cohen, Andrea Bellini, Mattia Libralato +3
This study constitutes part of a larger effort aimed at better characterizing the Galactic globular clusters (GGCs) located towards the inner Milky Way bulge and disk. Here, we foc…
Kinematic complexity around NGC419: resolving the proper motion of the cluster, the Small Magellanic Cloud and the Magellanic Bridge
Davide Massari, Silvia Raso, Mattia Libralato +1
We present proper motions in the direction of the star cluster NGC419 in the Small Magellanic Cloud. Because of the high precision o…
The absolute proper motions of the Arches and Quintuplet clusters
M. Libralato, M. Fardal, D. Lennon +2
Arches and Quintuplet are two young, massive clusters projected near the Galactic Center. To date, studies focused on understanding their origin have been based on proper motions (…
The WAGGS project -- III. Discrepant mass-to-light ratios of Galactic globular clusters at high metallicity
H. Dalgleish, S. Kamann, C. Usher +10
Observed mass-to-light ratios (M/L) of metal-rich globular clusters (GCs) disagree with theoretical predictions. This discrepancy is of fundamental importance since stellar populat…
Galactic globular clusters: a new catalog of masses, structural parameters, velocity dispersion profiles, proper motions and space orbits
Michael Hilker, Holger Baumgardt, Antonio Sollima +1
We collected radial velocities of more than 50.000 individual stars in 156 Galactic globular clusters (GGC) and matched them with HST photometry and Gaia DR2 proper motions. This a…
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…
Astro2020 Science White Paper: The Local Relics of of Supermassive Black Hole Seeds
Jenny E Greene, Aaron Barth, Andrea Bellini +18
We have compelling evidence for stellar-mass black holes (BHs) of ~5-80 M_sun that form through the death of massive stars. We also have compelling evidence for so-called supermass…
Envisioning the next decade of Galactic Center science: a laboratory for the study of the physics and astrophysics of supermassive black holes
Tuan Do, Andrea Ghez, Jessica R. Lu +38
As the closest example of a galactic nucleus, the Galactic center (GC) presents an exquisite laboratory for learning about supermassive black holes (SMBH) and their environment. We…
Astro2020 Science White Paper: Science at the edges: internal kinematics of globular clusters' external fields
A. Bellini, M. Libralato, J. Anderson +17
The outer regions of globular clusters can enable us to answer many fundamental questions concerning issues ranging from the formation and evolution of clusters and their multiple…
A panchromatic view of the bulge globular cluster NGC 6569
S. Saracino, E. Dalessandro, F. R. Ferraro +12
We used high-resolution optical HST/WFC3 and multi-conjugate adaptive optics assisted GEMINI GeMS/GSAOI observations in the near-infrared to investigate the physical properties of…
The HST Large Programme on NGC 6752. I. Serendipitous discovery of a dwarf Galaxy in background
L. R. Bedin, M. Salaris, R. M. Rich +12
As part of a large Hubble Space Telescope investigation aiming at reaching the faintest stars in the Galactic globular cluster NGC 6752, an ACS/WFC field was the subject of deep op…