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Mapping Gaia parallax systematic errors over the sky with faint Milky Way stars
Mark A. Fardal, Roeland van der Marel, Andres del Pino +1
Parallaxes measured by the Gaia mission have huge significance for astronomy, but parallaxes in Gaia DR2 are known to have systematic errors that depend on the source position and…
Deciphering the Kinematic Structure of the Small Magellanic Cloud through its Red Giant Population
Paul Zivick, Nitya Kallivayalil, Roeland P. van der Marel
We present a new kinematic model for the Small Magellanic Cloud (SMC), using data from the \gaia\ Data Release 2 catalog. We identify a sample of astrometrically well-behaved red g…
Revealing the Structure and Internal Rotation of the Sagittarius Dwarf Spheroidal Galaxy with Gaia and Machine Learning
Andrés del Pino, Mark A. Fardal, Roeland P. van der Marel +3
We present a detailed study of the internal structure and kinematics of the core of the Sagittarius dwarf spheroidal galaxy (Sgr). Using machine-learning techniques, we have combin…
HST Proper Motions of NGC 147 and NGC 185: Orbital Histories and Test of Dynamically Coherent Andromeda Satellite Plane
Sangmo Tony Sohn, Ekta Patel, Mark A. Fardal +4
We present the first proper motion (PM) measurements for the dwarf elliptical galaxies NGC 147 and NGC 185, two satellite galaxies of M31, using multi-epoch HST imaging data with t…
The Orbital Histories of Magellanic Satellites Using Gaia DR2 Proper Motions
Ekta Patel, Nitya Kallivayalil, Nicolas Garavito-Camargo +6
With the release of Gaia DR2, it is now possible to measure the proper motions (PMs) of the lowest mass, ultra-faint satellite galaxies in the Milky Way's (MW) halo for the first t…
The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters. XX. Ages of single and multiple stellar populations in seven bulge globular clusters
R. A. P. Oliveira, S. O. Souza, L. O. Kerber +23
In the present work we analyzed seven globular clusters selected from their location in the Galactic bulge and with metallicity values in the range $-1.30\lesssim\rm{[Fe/H]}\lesssi…