20-24 March 2023
Haus H, Telegrafenberg
Europe/Berlin timezone

Velocity dipoles in the halos of FIRE simulated galaxies

23 Mar 2023, 10:16
Haus H, Telegrafenberg

Haus H, Telegrafenberg

Potsdam, Germany
Poster SESSION 4 : The Magellanic System: the Clouds, the Stream and the Leading Arm SESSION 4 : The Magellanic System: the Clouds, the Stream and the Leading Arm


Alex Riley (Durham University)


One major source of disequilibrium in the Milky Way is its most massive satellite, the LMC. Kinematics of distant halo tracers show a velocity dipole in the Milky Way halo, which has been interpreted using N-body simulations as the LMC inducing a reflex motion in the Milky Way disk. In this talk, I discuss applying this framework to more realistic halos comprised of substructure from the FIRE-2 zoom-in cosmological simulations. Velocity dipoles are resolved in Milky Way-mass hosts experiencing an LMC-like interaction and evolve in a manner consistent with a two-body interaction between the stellar disk and the LMC analog. The magnitude of this dipole can be used to constrain the mass ratio of the Milky Way and LMC. However, satellite galaxies and stellar streams can create velocity dipoles in systems that aren't experiencing a major satellite accretion, suggesting that care must be taken to remove substructure in the Milky Way observations.

Do you plan to attend the symposium in-person or virtually? in-person

Primary author

Alex Riley (Durham University)

Presentation Materials