Cited by 105Galaxies: Formation, Evolution, PhenomenaStellar, planetary, and galactic studiesAstrophysical Phenomena and Observations

Warps and waves in the stellar discs of the Auriga cosmological simulations

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Gómez, Facundo A., White, Simon D. M., Grand, Robert J. J., Marinacci, Federico, Springel, Volker, Pakmor, Rüdiger·2017·Monthly Notices of the Royal Astronomical Society

Abstract

Recent studies have revealed an oscillating asymmetry in the vertical structure of the Milky Way's disc. Here, we analyse 16 high-resolution, fully cosmological simulations of the evolution of individual Milky Way-sized galaxies, carried out with the magnetohydrodynamic code arepo. At redshift zero, about 70 per cent of our galactic discs show strong vertical patterns, with amplitudes that can exceed 2 kpc. Half of these are typical ‘integral sign’ warps. The rest are oscillations similar to those observed in the Milky Way. Such structures are thus expected to be common. The associated mean vertical motions can be as large as 30 km s−1. Cold disc gas typically follows the vertical patterns seen in the stars. These perturbations have a variety of causes: close encounters with satellites, distant fly-bys of massive objects, accretion of misaligned cold gas from halo infall or from mergers. Tidally induced vertical patterns can be identified in both young and old stellar populations, whereas those originating from cold gas accretion are seen mainly in the younger populations. Galaxies with regular or at most weakly perturbed discs are usually, but not always, free from recent interactions with massive companions, although we have one case where an equilibrium compact disc reforms after a merger.

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Research works printed but not linked: 7

  1. D'Onghia E., Madau P., Vera-Ciro C., Quillen A., Hernquist L., 2015, ArXiv e-prints
  2. Grand R. J. J. et al., 2016a, ArXiv e-prints
  3. Kaiser N. et al., 2010, in Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series, Vol. 7733, Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series, p. 0
  4. Marinacci F., Grand R., Pakmor R., Springel V., G´ omez F., Frenk C., White S., 2016, ArXiv e-prints
  5. Moetazedian R., Just A., 2015, ArXiv e-prints
  6. Morganson E. et al., 2016, ArXiv e-prints
  7. Yurin D., Springel V., 2014, ArXiv e-prints

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Authors
Gómez, F. A., White, S. D. M., Grand, R. J. J., Marinacci, F., Springel, V., & Pakmor, R.
Affiliations
  • Max Planck Institute for Astrophysics (DE)
  • Heidelberg University (DE)
  • Massachusetts Institute of Technology (US)
  • Heidelberg Institute for Theoretical Studies (DE)
Corresponding author
Gómez, Facundo A.
Venue
Monthly Notices of the Royal Astronomical Society
Published
2016-11-17
Volume
465
Issue
3
Pages
3446-3460
ISSN
  • 0035-8711 (ISSN-L)
  • 1365-2966
OpenAlex
W2552938122
Cited by
105
References
88
Citations by year
2026: 5 · 2025: 12 · 2024: 4 · 2023: 11 · 2022: 16 · 2021: 12 · 2020: 8 · 2019: 8 · 2018: 17 · 2017: 10 · 2016: 1 · 2015: 1
FWCI
5.74
Type
journal article
Language
en
Open access
Locations
  • Monthly Notices of the Royal Astronomical Society (publishedVersion)
  • Liverpool John Moores University (acceptedVersion)
  • arXiv (Cornell University) (submittedVersion)
  • Archivio istituzionale della ricerca (Alma Mater Studiorum Università di Bologna) (submittedVersion)
  • HighWire Press Open Archive (submittedVersion)
  • MPG.PuRe (Max Planck Society) (submittedVersion)
  • arXiv (Cornell University)
Funders
ERC (EXAGAL-308037)
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
galactic warps, stellar disks, Galactic disk, cold gas accretion, tidal perturbations, galaxy mergers, disk kinematics, Auriga simulations, stellar populations

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