The hierarchical model of galaxy formation predicts that the Milky Way halo is populated by
tidal debris of dwarf galaxies and globular clusters. Due to long dynamical times, debris from …

Context. Merger debris is expected to populate the stellar haloes of galaxies. In the case of
the Milky Way, this debris should be apparent as clumps in a space defined by the orbital …

Context. In an accompanying paper, we present a data-driven method for clustering in
'integrals of motion'space and apply it to a large sample of nearby halo stars with 6D phase …

Context. Sequoia is a retrograde kinematic substructure in the nearby Galactic halo, whose
properties are a matter of debate. For example, previous studies do not necessarily agree on …

We present an atlas and follow-up spectroscopic observations of 87 thin stream-like
structures detected with the STREAMFINDER algorithm in Gaia DR3, of which 28 are new …

Context. The Helmi streams are a kinematic substructure whose progenitor is likely a dwarf
galaxy. Although 20 years have passed since their discovery, it is still unclear whether their …

Many barred galaxies exhibit upturns (shoulders) in their bar-major-axis density profile.
Simulation studies have suggested that shoulders are supported by looped x 1 orbits, occur …

The shape and orientation of dark matter (DM) halos are sensitive to the microphysics of the
DM particles, yet in many mass models, the symmetry axes of the Milky Way's DM halo are …

Context. Stellar streams are particularly sensitive probes of the mass distribution of galaxies.
Aims. In this work, we focus on the Helmi streams (HS), the remnants of an accreted dwarf …

Very metal-poor (VMP) stars record the signatures of early accreted galaxies, making them
essential tools for unraveling the early stages of Galaxy formation. Understanding the origin …