The Gaia mission has revolutionized our view of the Milky Way and its satellite citizens. The
field of Galactic Archaeology has been piecing together the formation and evolution of the …

▪ Abstract The formation and evolution of galaxies is one of the great outstanding problems
of astrophysics. Within the broad context of hierachical structure formation, we have only a …

Several lines of evidence suggest that the Milky Way underwent a major merger at z∼ 2 with
the Gaia-Sausage-Enceladus (GSE) galaxy. Here we use H3 Survey data to argue that GSE …

Nearly a hundred stellar streams have been found to date around the Milky Way and the
number keeps growing at an ever faster pace. Here we present the galstreams library, a …

Abstract The Apache Point Observatory Galactic Evolution Experiment (APOGEE), one of the
programs in the Sloan Digital Sky Survey III (SDSS-III), has now completed its systematic …

ABSTRACT The Sloan Extension for Galactic Understanding and Exploration (SEGUE)
Survey obtained≈ 240,000 moderate-resolution (R∼ 1800) spectra from 3900 Å to 9000 Å …

Using the photometric parallax method we estimate the distances to∼ 48 million stars
detected by the Sloan Digital Sky Survey (SDSS) and map their three-dimensional number …

We present the first all-sky view of the Sagittarius (Sgr) dwarf galaxy mapped by M-giant star
tracers detected in the complete Two Micron All Sky Survey (2MASS). Near-infrared …

We identify new structures in the halo of the Milky Way from positions, colors, and
magnitudes of five million stars detected in the Sloan Digital Sky Survey. Most of these stars …

Modern Galactic surveys have revealed an ancient merger that dominates the stellar halo of
our galaxy (Gaia–Sausage–Enceladus, GSE). Using chemical abundances and kinematics …