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Tango for three: Sagittarius, LMC, and the Milky Way
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We assemble a catalogue of candidate Sagittarius stream members with 5D and 6D phase-space information, using astrometric data from Gaia DR2, distances estimated from RR Lyrae stars, and line-of-sight velocities from various spectroscopic surveys. We find a clear misalignment between the stream track and the direction of the reflex-corrected proper motions in the leading arm of the stream, which we interpret as a signature of a time-dependent perturbation of the gravitational potential. A likely cause of this perturbation is the recent passage of the most massive Milky Way satellite – the Large Magellanic Cloud (LMC). We develop novel methods for simulating the Sagittarius stream in the presence of the LMC, using specially tailored N-body simulations and a flexible parametrization of the Milky Way halo density profile. We find that while models without the LMC can fit most stream features rather well, they fail to reproduce the misalignment and overestimate the distance to the leading arm apocentre. On the other hand, models with an LMC mass in the range $(1.3\pm 0.3)\times 10^{11}\, \mathrm{M}_\odot$ rectify these deficiencies. We demonstrate that the stream can not be modelled adequately in a static Milky Way. Instead, our Galaxy is required to lurch toward the massive in-falling Cloud, giving the Sgr stream its peculiar shape and kinematics. By exploring the parameter space of Milky Way potentials, we determine the enclosed mass within 100 kpc to be $(5.6\pm 0.4)\times 10^{11}\, \mathrm{M}_\odot$, and the virial mass to be $(9.0\pm 1.3)\times 10^{11}\, \mathrm{M}_\odot$, and find tentative evidence for a radially-varying shape and orientation of the Galactic halo.
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“The Sagittarius stream gives M ( < 100 kpc) = 5 . 6 ± 0 . 4 × 10 11 M ⊙ and M vir = 9 . 0 ± 1 . 3 × 10 11 M ⊙ in the adopted halo family (Vasiliev et al., 2021).”
From The rotation curve of the Milky Way: State of the art, the Keplerian decline debate, and implications for dark matter (2026) · cites this paper as Vasiliev et al., 2021
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Metadata
- Authors
- Vasiliev, E., Belokurov, V., & Erkal, D.
- Affiliations
- P.N. Lebedev Physical Institute of the Russian Academy of Sciences (RU)
- University of Cambridge (GB)
- University of Surrey (GB)
- Corresponding author
- Vasiliev, Eugene
- Venue
- Monthly Notices of the Royal Astronomical Society
- Publisher
- Oxford University Press (OUP)
- Published
- 2020-11-25
- Volume
- 501
- Issue
- 2
- Pages
- 2279-2304
- ISSN
- 0035-8711 (ISSN-L)
- 1365-2966
- OpenAlex
- W3087827168
- Cited by
- 285
- References
- 136
- Citations by year
- 2026: 39 · 2025: 60 · 2024: 48 · 2023: 47 · 2022: 47 · 2021: 42 · 2020: 2
- FWCI
- 15.47
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Licence
- academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model (vor)
- Locations
- Monthly Notices of the Royal Astronomical Society (publishedVersion)
- arXiv (Cornell University) (publishedVersion)
- arXiv (Cornell University)
- Funders
- Science and Technology Facilities Council
- Topics
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Stellar, planetary, and galactic studies
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Galaxies: Formation, Evolution, Phenomena
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astrophysical Phenomena and Observations
- Keywords
- Sagittarius stream, Large Magellanic Cloud, Galactic halo, gravitational perturbations, N-body simulations, Milky Way potential, halo mass, halo shape, stream kinematics, Gaia DR2 astrometry
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