Galaxies and their dark-matter haloes have posed several challenges to the dark energy
plus cold dark matter (Λ CDM) cosmological model. These discrepancies between …

The lowest luminosity (L) Milky Way satellite galaxies represent the extreme lower limit of the
galaxy luminosity function. These ultra-faint dwarfs are the oldest, most dark matter …

Abstract The Milky Way halo was predominantly formed by the merging of numerous
progenitor galaxies. However, our knowledge of this process is still incomplete, especially in …

ABSTRACT We determine the Milky Way (MW) mass profile inferred from fitting physically
motivated models to the Gaia DR2 Galactic rotation curve and other data. Using various …

We have derived the mean proper motions and space velocities of 154 Galactic globular
clusters and the velocity dispersion profiles of 141 globular clusters based on a combination …

We present results from the" Mint" resolution DC Justice League suite of Milky Way–like
zoom-in cosmological simulations, which extend our study of nearby galaxies down into the …

We combine Gaia early data release 3 astrometry with accurate photometry and utilize a
probabilistic mixture model to measure the systemic proper motion of 52 dwarf spheroidal …

Abstract We use Gaia Data Release 2 to determine the mean proper motions for 150 Milky
Way globular clusters (almost the entire known population), with a typical uncertainty of 0.05 …

Aims. We perform a comprehensive determination of the systemic proper motions of 74
dwarf galaxies and dwarf galaxy candidates in the Local Group based on Gaia early data …

We report the kinematic, orbital, and chemical properties of 12 stellar streams with no
evident progenitors using line-of-sight velocities and metallicities from the Southern Stellar …