Denis Erkal
Detection of the LMC-induced sloshing of the Galactic halo
Erkal, Denis; Deason, Alis J; Belokurov, Vasily; Xue, Xiang-Xiang; Koposov, Sergey E; Bird, Sarah A; Liu, Chao; Simion, Iulia T; Yang, Chengqun; Zhang, Lan; Zhao, Gang
Authors
Professor Alis Deason alis.j.deason@durham.ac.uk
Professor
Vasily Belokurov
Xiang-Xiang Xue
Sergey E Koposov
Sarah A Bird
Chao Liu
Iulia T Simion
Chengqun Yang
Lan Zhang
Gang Zhao
Abstract
A wealth of recent studies have shown that the LMC is likely massive, with a halo mass >1011M⊙. One consequence of having such a nearby and massive neighbour is that the inner Milky Way is expected to be accelerated with respect to our Galaxy’s outskirts (beyond ∼30 kpc). In this work we compile a sample of ∼500 stars with radial velocities in the distant stellar halo, rGC > 50 kpc, to test this hypothesis. These stars span a large fraction of the sky and thus give a global view of the stellar halo. We find that stars in the Southern hemisphere are on average blueshifted, while stars in the North are redshifted, consistent with the expected, mostly downwards acceleration of the inner halo due to the LMC. We compare these results with simulations and find the signal is consistent with the infall of a 1.5 × 1011M⊙ LMC. We cross-match our stellar sample with Gaia DR2 and find that the mean proper motions are not yet precise enough to discern the LMC’s effect. Our results show that the Milky Way is significantly out of equilibrium and that the LMC has a substantial effect on our Galaxy.
Citation
Erkal, D., Deason, A. J., Belokurov, V., Xue, X.-X., Koposov, S. E., Bird, S. A., Liu, C., Simion, I. T., Yang, C., Zhang, L., & Zhao, G. (2021). Detection of the LMC-induced sloshing of the Galactic halo. Monthly Notices of the Royal Astronomical Society, 506(2), 2677-2684. https://doi.org/10.1093/mnras/stab1828
Journal Article Type | Article |
---|---|
Acceptance Date | Jun 24, 2021 |
Online Publication Date | Jul 1, 2021 |
Publication Date | 2021-09 |
Deposit Date | Jul 14, 2021 |
Publicly Available Date | Jul 14, 2021 |
Journal | Monthly Notices of the Royal Astronomical Society |
Print ISSN | 0035-8711 |
Electronic ISSN | 1365-2966 |
Publisher | Royal Astronomical Society |
Peer Reviewed | Peer Reviewed |
Volume | 506 |
Issue | 2 |
Pages | 2677-2684 |
DOI | https://doi.org/10.1093/mnras/stab1828 |
Public URL | https://durham-repository.worktribe.com/output/1245639 |
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Copyright Statement
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2021 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
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