THE MILKY WAY IN MOTION
A slowing bar.
A changing Galaxy.
A simulation of the Milky Way with a decelerating bar. Exploring the rotating stellar components of the bulge and halo through test-particle simulations and Gaia DR3.
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Four billion years of evolution.
Spatial distribution of test particles after 4 Gyr of evolution in the simulation, shown in three projected planes.
A common spatial selection.
Observed spatial distribution and the corresponding simulation sample after three-dimensional resampling to match the observational selection in position space.
The selected stellar component.
Observed and resampled simulated samples after applying the neural-network classifier, showing the selected component in three projected planes.
THE RESEARCH QUESTION
How does a bar
reshape a Galaxy?
This project investigates a rotating stellar component in the Galactic bulge and halo using classification applied to Gaia DR3. Test-particle simulations provide a framework for interpreting angular-momentum transfer from a decelerating Galactic bar.
The diagnostics connect the simulated distribution to the observational sample: first through spatial resampling, then through the neural-network selection.
RELATED PUBLICATION
The Rotating Bulge and Halo in the Milky Way: Evidence of Angular Momentum Transferred from the Decelerating Bar
The Astrophysical Journal · 2025
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