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The Milky Way has no in-situ halo other than the heated thick disc. Composition of the stellar halo and age-dating the last significant merger with Gaia DR2 and APOGEE
P. Di Matteo, M. Haywood, M. D. Lehnert +5
Previous studies based on the analysis of Gaia DR2 data have revealed that accreted stars, possibly originating from a single progenitor satellite, are a significant component of t…
Mergers, tidal interactions, and mass exchange in a population of disc globular clusters: II. Long-term evolution
Alessandra Mastrobuono-Battisti, Sergey Khoperskov, Paola Di Matteo +1
Globular clusters (GCs), the oldest stellar systems observed in the Milky Way, have for long been considered single stellar populations. As such, they provided an ideal laboratory…
The echo of the bar buckling: phase-space spirals in Gaia DR2
Sergey Khoperskov, Paola Di Matteo, Ortwin Gerhard +5
Using a single N-body simulation () we explore the formation, evolution and spatial variation of the phase-space spirals similar to those recently discovered by…
Mergers, tidal interactions, and mass exchange in a population of disc globular clusters
Sergey Khoperskov, Alessandra Mastrobuono-Battisti, Paola Di Matteo +1
We present the results of a self-consistent -body simulation following the evolution of a primordial population of thick disc globular clusters (GCs). We study how the internal…
Galactic planetary nebulae as probes of radial metallicity gradients and other abundance patterns
Letizia Stanghellini, Misha Haywood
We use planetary nebulae (PNe) as probes to determine the Galactic radial oxygen gradients, and other abundance patterns. We select data homogeneously from recent data sets, includ…
Gaia Data Release 2. Summary of the contents and survey properties
Gaia Collaboration, A. G. A. Brown, A. Vallenari +4
We present the second Gaia data release, Gaia DR2, consisting of astrometry, photometry, radial velocities, and information on astrophysical parameters and variability, for sources…