摘要：Aims.We present the first three-dimensional internal motions for individual stars in the Draco dwarf spheroidal galaxy.Methods.By combining first-epochHubbleSpace Telescope observations and second-epochGaiaData Release 2 positions, we measured the proper motions of 149 sources in the direction of Draco. We determined the line-of-sight velocities for a sub-sample of 81 red giant branch stars using medium resolution spectra acquired with the DEIMOS spectrograph at the Keck II telescope. Altogether, this resulted in a final sample of 45 Draco members with high-precision and accurate 3D motions, which we present as a table in this paper.Results.Based on this high-quality dataset, we determined the velocity dispersions at a projected distance of ∼120 pc from the centre of Draco to beσR= 11.0−1.5+2.1km s−1,σT= 9.9−3.1+2.3km s−1andσLOS= 9.0−1.1+1.1km s−1in the projected radial, tangential, and line-of-sight directions. This results in a velocity anisotropyβ= 0.25−1.38+0.47atr ≳ 120 pc. Tighter constraints may be obtained using the spherical Jeans equations and assuming constant anisotropy and Navarro-Frenk-White (NFW) mass profiles, also based on the assumption that the 3D velocity dispersion should be lower than ≈1/3 of the escape velocity of the system. In this case, we constrain the maximum circular velocityVmaxof Draco to be in the range of 10.2−17.0 km s−1. The corresponding mass range is in good agreement with previous estimates based on line-of-sight velocities only.Conclusions.Our Jeans modelling supports the case for a cuspy dark matter profile in this galaxy. Firmer conclusions may be drawn by applying more sophisticated models to this dataset and with new datasets from upcomingGaiareleases.
关键词：engalaxies: dwarfLocal Groupgalaxies: kinematics and dynamicsproper motionstechniques: radial velocities
