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The study of the Galactic mass distribution from Gaia DR3 RR Lyrae
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- Journal:
- Proceedings of the International Astronomical Union / Volume 19 / Issue S379 / December 2023
- Published online by Cambridge University Press:
- 30 October 2025, pp. 72-78
- Print publication:
- December 2023
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- Article
- Export citation
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Based on RR Lyrae with accurate proper motions and classification in Gaia DR3, we determine the Milky Way mass distribution from fitting dynamical models to the gravitational force field and the Galactic rotation curve. Applying Gaussian Mixture Model to the intrinsic velocity distribution, we present the result of a multi-component kinematic model of RR Lyrae in the inner regions 5 ≲ r ≲ 20 kpc. Considering the early accretion history of the MW and thus the stellar halo may not be in equilibrium, we separate the halo population into an isotropic stellar halo and the radially-anisotropic population relevant to a merge event. With a Bayesian approach, we fit the potential model parameters, including the density flattening of the dark matter (DM) halo. Our best-fitting dynamical model suggests a nearly spherical spheroid shape of
, a DM halo mass of 
, total MW mass of 
.
