HSTPROMO Internal Proper-motion Kinematics of Dwarf Spheroidal Galaxies. I. Velocity Anisotropy and Dark Matter Cusp Slope of Draco

We analyze four epochs of Hubble Space Telescope imaging over 18 yr for the Draco dwarf spheroidal galaxy. We measure precise proper motions for hundreds of stars and combine these with existing line-of-sight (LOS) velocities. This provides the first radially resolved 3D velocity dispersion profiles...

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Bibliographic Details

Published in:	The Astrophysical Journal
Main Authors:	Eduardo Vitral, Roeland P. van der Marel, Sangmo Tony Sohn, Mattia Libralato, Andrés del Pino, Laura L. Watkins, Andrea Bellini, Matthew G. Walker, Gurtina Besla, Marcel S. Pawlowski, Gary A. Mamon
Format:	Article
Language:	English
Published:	IOP Publishing 2024-01-01
Subjects:	Dark matter Dwarf spheroidal galaxies Astronomy data analysis Proper motions Stellar kinematics Stellar dynamics
Online Access:	https://doi.org/10.3847/1538-4357/ad571c