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Cited by 230Galaxies: Formation, Evolution, PhenomenaStellar, planetary, and galactic studiesAstrophysical Phenomena and Observations

The influence of Sagittarius and the Large Magellanic Cloud on the stellar disc of the Milky Way Galaxy

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Laporte, Chervin F P, Johnston, Kathryn V, Gómez, Facundo A, Garavito-Camargo, Nicolas, Besla, Gurtina·2018·Monthly Notices of the Royal Astronomical Society
DOI 10.1093/mnras/sty1574
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Abstract

We present N-body simulations of a Sagittarius (Sgr)-like dwarf spheroidal galaxy that follows its orbit about the Milky Way (MW) since its first crossing of the Galaxy’s virial radius to the present day. As Sgr orbits around the MW, it excites vertical oscillations, corrugating and flaring the Galactic stellar disc. These responses can be understood by a two-phase picture in which the interaction is first dominated by torques from the wake excited by Sgr in the MW dark halo before transitioning to tides from Sgr’s direct impact on the disc at late times. We show for the first time that a massive Sgr model simultaneously reproduces the locations and motions of arclike overdensities, such as the Monoceros Ring and the Triangulum Andromeda stellar clouds, that have been observed at the extremities of the disc, while also satisfying the solar-neighbourhood constraints on the vertical structure and streaming motions of the disc. In additional simulations, we include the Large Magellanic Cloud (LMC) self-consistently with Sgr. The LMC introduces coupling through constructive and destructive interference, but no new corrugations. In our models, the excitation of the current structure of the outer disc can be traced to interactions as far back as 6–7Gyr ago (corresponding to z ≤ 1). Given the apparently quiescent accretion history of the MW over this time-scale, this places Sgr as the main culprit behind the vertical oscillations of the disc and the last major accretion event for the Galaxy with the capacity to modulate its chemodynamical structure.

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  • The Sagittarius dwarf galaxy's multiple pericentre passages excite bending waves in the disc with amplitudes about 1-2 kpc and associated non-circular motions of about 10-20 km/s at R about 20 kpc (Laporte et al., 2018).

    “The Sagittarius dwarf galaxy's multiple pericentre passages excite bending waves in the disc with amplitudes ∼ 1-2 kpc and associated non-circular motions of ∼ 10-20 km s -1 at R ∼ 20 kpc (Laporte et al., 2018).”

    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 Laporte et al. (2018)

    Section 5.1 (pp. 12–13) reports that successive Sagittarius passages amplify vertical disturbances and produce streaming motions. But the copy does not establish the claimed combination of 1–2 kpc bending-wave amplitudes and 10–20 km/s non-circular motions at R ≈ 20 kpc: Section 4.1 (p. 8) gives model-dependent heights and outer-disc vertical velocities ranging from about 10 to 50 km/s, while Section 5.1 (p. 13) reports radial perturbations as high as 100 km/s beyond R > 16 kpc. (LLM, conf=0.85)

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Research works printed but not linked: 12

  1. Bernard E. J., Ferguson A. M. N., Schlafly E. F., Martin N. F., Rix H.-W., Bell E. F., Finkbeiner D. P., Goldman B., Martinez-Delgado D., Sesar B., Wyse R. F. G., Burgett W. S., 2016, ArXiv e-prints
  2. Chequers M. H., Widrow L. M., 2017, ArXiv e-prints
  3. de Boer T. J. L., Belokurov V., Koposov S. E., 2017, ArXiv eprints
  4. DESI Collaboration Aghamousa A., Aguilar J., Ahlen S., Alam S., Allen L. E., Allende Prieto C., Annis J., Bailey S., 2016, ArXiv e-prints
  5. Famaey B., Antoja T., Romero-Gomez M., Siebert A., Babusiaux C., Di Matteo P., Figueras F., Fragkoudi F., Garzon-Lopez F., Gonzalez-Fernandez C., Martinez-Valpuesta I., Monari G., Mor-Crespo R., Hill V., 2016, in Reyl´ e C., Richard J., Cambr´ esy L., Deleuil M., P´ econtal E., Tresse L., Vauglin I., eds, SF2A-2016: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics The WEAVE disk dynamics survey. pp 281-286
  6. Feltzing S., Bensby T., Bergemann M., Chiappini C., Christlieb N., Cioni M. R., Helmi A., Irwin M., Minchev I., Starkenburg E., de Jong R., 2017, ArXiv e-prints
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  8. G´ omez F. A., White S. D. M., Grand R. J. J., Marinacci F., Springel V., Pakmor R., 2016, ArXiv e-prints
  9. Ibata R., McConnachie A., Cuillandre J.-C., Fantin N., Haywood M., Martin N. F., Bergeron P., Beckmann V., Bernard E., Bonifacio P., Caffau E., 2017a, ArXiv e-prints
  10. Ibata R., McConnachie A., Cuillandre J.-C., Fantin N., Haywood M., Martin N. F., Bergeron P., Beckmann V., Bernard E., Bonifacio P., Caffau E., 2017b, ArXiv e-prints
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  12. J., 2017, ArXiv e-prints

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Authors
Laporte, C. F. P., Johnston, K. V., Gómez, F. A., Garavito-Camargo, N., & Besla, G.
Affiliations
  • Columbia University (US)
  • Max Planck Institute for Astrophysics (DE)
  • Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 8572, USA
  • University of Arizona (US)
Corresponding author
Laporte, Chervin F P
ORCID
Venue
Monthly Notices of the Royal Astronomical Society
Publisher
Oxford University Press (OUP)
Published
2018-06-14
Volume
481
Issue
1
Pages
286-306
ISSN
  • 0035-8711 (ISSN-L)
  • 1365-2966
DOI
10.1093/mnras/sty1574
OpenAlex
W2762263554
Cited by
230
References
131
Citations by year
2026: 13 · 2025: 27 · 2024: 28 · 2023: 37 · 2022: 31 · 2021: 30 · 2020: 29 · 2019: 22 · 2018: 13
FWCI
12.61
Type
journal article
Language
en
Open access
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) (submittedVersion)
  • MPG.PuRe (Max Planck Society) (submittedVersion)
  • arXiv (Cornell University)
Funders
  • National Science Foundation (OCI-1053575)
  • Norsk Sykepleierforbund (AST-1312196, AST-1614743)
Topics
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Galaxies: Formation, Evolution, Phenomena
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Stellar, planetary, and galactic studies
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astrophysical Phenomena and Observations
Keywords
Sagittarius dwarf galaxy, Large Magellanic Cloud, vertical oscillation, disc flaring, galactic tides, gravitational torque, Monoceros Ring, chemodynamics, N-body simulations

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