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research article

Dynamics of stellar disc tilting from satellite mergers

Dodge, Benjamin C.
•
Slone, Oren
•
Lisanti, Mariangela
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January 1, 2023
Monthly Notices Of The Royal Astronomical Society

The Milky Way's stellar disc can tilt in response to torques that result from infalling satellite galaxies and their associated tidal debris. In this work, we explore the dynamics of disc tilting by running N-body simulations of mergers in an isolated, isotropic Milky Way-like host galaxy, varying over satellite virial mass, initial position, and orbit. We develop and validate a first-principles understanding of the dynamics that govern how the host galaxy's stellar disc responds to the satellite's dark matter (DM) debris. We find that the degree of disc tilting can be large for cosmologically motivated merger histories. In particular, our results suggest that the Galactic disc may still be tilting in response to Gaia-Sausage-Enceladus, one of the most significant recent mergers in the Milky Way's history. These findings have implications for terrestrial direct detection experiments as disc tilting changes the relative location of the Sun with respect to DM substructure left behind by a merging galaxy.

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Type
research article
DOI
10.1093/mnras/stac3249
Web of Science ID

WOS:000898988700022

Author(s)
Dodge, Benjamin C.
Slone, Oren
Lisanti, Mariangela
Cohen, Timothy  
Date Issued

2023-01-01

Published in
Monthly Notices Of The Royal Astronomical Society
Volume

518

Issue

2

Start page

2870

End page

2884

Subjects

Astronomy & Astrophysics

•

Astronomy & Astrophysics

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galaxy: disc

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galaxy: evolution

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galaxy: kinematics and dynamics

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galaxies: interactions

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galaxies: kinematics and dynamics

•

dark matter

•

milky-way

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chemical-evolution

•

sinking satellites

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galaxy formation

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figure rotation

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halo

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gaia

•

apogee

•

models

•

stars

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

Available on Infoscience
January 30, 2023
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/194465
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