5.4k citations · 7.8k across the 27 of their papers we have counts for
19 papers · 1 filter
SchwarMAX: a GPU-friendly Schwarzschild orbit-superposition modelling framework
HanYuan Zhang, David Chemaly, Eugene Vasiliev +3
The Schwarzschild orbit-superposition method is a highly flexible dynamical modelling tool. It constrains the mass distribution of a galaxy using line-of-sight velocity and photome…
Orbital migration and heating history of the Galactic disc: a transition between the bimodal discs
HanYuan Zhang, Vasily Belokurov, Jason L. Sanders +7
Stellar orbits in the Galactic disc evolve from their birth to the current shape through both radial migration and dynamical heating. The history of their secular evolution is impr…
Enhanced rates of stellar radial migration in gas-rich discs at high redshift
HanYuan Zhang, Thor Tepper-García, Vasily Belokurov +6
Radial migration and dynamical heating redistribute stars within galactic discs and thereby modify the chemo-kinematic structure of their host galaxies. Usually, these secular proc…
Observational Constraints of Radial Migration in the Galactic Disc Driven by the Slowing Bar
HanYuan Zhang, Vasily Belokurov, N. Wyn Evans +7
Radial migration is an important dynamical effect that has reshaped the Galactic disc, but its origin has yet to be elucidated. In this work, we present evidence that resonant drag…
VIRAC2: NIR Astrometry and Time Series Photometry for 500M+ Stars from the VVV and VVVX Surveys
Leigh C. Smith, Philip W. Lucas, Sergey E. Koposov +11
We present VIRAC2, a catalogue of positions, proper motions, parallaxes and , , , , and near-infrared photometric time series of 545 346 537 unique stars. The cat…
Blind source separation of the stellar halo
Elliot Y. Davies, Vasily Belokurov, Andrey Kravtsov +4
The stellar halo of the Milky Way comprises an abundance of chemical signatures from accretion events and \textit{in-situ} evolution, that form an interweaving tapestry in kinemati…
Deciphering the Milky Way disc formation time encrypted in the bar chrono-kinematics
Hanyuan Zhang, Vasily Belokurov, N. Wyn Evans +3
We present a novel method to constrain the formation time of the Milky Way disc using the chrono-kinematic signatures of the inner Galaxy. We construct an O-rich Mira variable samp…
Kinematics and dynamics of the Galactic bar revealed by Gaia long-period variables
Hanyuan Zhang, Vasily Belokurov, N. Wyn Evans +2
We use low-amplitude, long period variable (LA-LPV) candidates in \textit{Gaia} DR3 to trace the kinematics and dynamics of the Milky Way bar. LA-LPVs, like other LPVs, are intrins…
Trojan globular clusters: radial migration via trapping in bar resonances
Adam M. Dillamore, Stephanie Monty, Vasily Belokurov +1
We search for globular clusters (GCs) trapped in resonances with the bar of the Milky Way. By integrating their orbits in a potential with a decelerating bar, we select 10 whose or…
Radial halo substructure in harmony with the Galactic bar
Adam M. Dillamore, Vasily Belokurov, N. Wyn Evans
Overdensities in the radial phase space of the Milky Way's halo have previously been associated with the phase-mixed debris of a highly radial merger event, such as Gaia…
Spatially resolved microlensing timescale distributions across the Galactic bulge with the VVV survey
Zofia Kaczmarek, Peter McGill, N. Wyn Evans +5
We analyze 1602 microlensing events found in the VISTA Variables in the Via Lactea (VVV) near-infrared (NIR) survey data. We obtain spatially-resolved, efficiency-corrected timesca…
A 6-d View of Stellar Shells
C. A. Dong-Páez, E. Vasiliev, N. W. Evans
Stellar shells are low surface brightness features, created during nearly head-on galaxy mergers from the debris of the tidally disrupted satellite. Here, we investigate the format…
Radialization of satellite orbits in galaxy mergers
Eugene Vasiliev, Vasily Belokurov, Wyn Evans
We consider the orbital evolution of satellites in galaxy mergers, focusing on the evolution of eccentricity. Using a large suite of N-body simulations, we study the phenomenon of…
Models of Distorted and Evolving Dark Matter Halos
J. L. Sanders, E. J. Lilley, E. Vasiliev +2
We investigate the ability of basis function expansions to reproduce the evolution of a Milky Way-like dark matter halo, extracted from a cosmological zoom-in simulation. For each…
The Early Merger that Made the Galaxy's Stellar Halo
N. W. Evans
The last two years have seen widespread acceptance of the idea that the Milky Way halo was largely created in an early (8-10 Gyr ago) and massive () merger. The…
A hypervelocity star with a Magellanic origin
Denis Erkal, Douglas Boubert, Alessia Gualandris +2
Using proper motion measurements from Gaia DR2, we probe the origin of 26 previously known hypervelocity stars (HVSs) around the Milky Way. We find that a significant fraction of t…
On Asymmetric Distributions of Satellite Galaxies
A. Bowden, N. W. Evans, V. Belokurov
We demonstrate that the asymmetric distribution of M31 satellites cannot be produced by tides from the Milky Way as such effects are too weak. However, loosely bound associations a…
Broken degeneracies: the rotation curve and velocity anisotropy of the Milky Way halo
A. J. Deason, V. Belokurov, N. W. Evans +1
We use distant Blue Horizontal Branch stars with Galactocentric distances 16 < r/kpc < 48 as kinematic tracers of the Milky Way dark halo. We model the tracer density as an oblate,…
No evidence for internal rotation in the remnant core of the Sagittarius dwarf
Jorge Penarrubia, Daniel B. Zucker, Mike J. Irwin +6
We have conducted a spectroscopic survey of the inner regions of the Sagittarius (Sgr) dwarf galaxy using the AAOmega spectrograph on the Anglo-Australian Telescope. We determine r…