Cited by 29Galaxies: Formation, Evolution, PhenomenaStellar, planetary, and galactic studiesCosmology and Gravitation Theories

Triaxial cosmological haloes and the disc of satellites

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Bowden, A., Evans, N. W., Belokurov, V.·2013·Monthly Notices of the Royal Astronomical Society

Abstract

We construct simple triaxial generalizations of Navarro–Frenk–White haloes. The models have elementary gravitational potentials, together with a density that is cusped like 1/r at small radii and falls off like 1/r3 at large radii. The ellipticity varies with radius in a manner that can be tailored to the user's specification. The closed periodic orbits in the planes perpendicular to the short and long axes of the model are well described by epicyclic theory, and can be used as building blocks for long-lived discs. As an application, we carry out the simulations of thin discs of satellites in triaxial dark halo potentials. This is motivated by the recent claims of an extended, thin disc of satellites around the M31 galaxy with a vertical rms scatter of ∼12 kpc and a radial extent of ∼300 kpc. We show that a thin satellite disc can persist over cosmological times if and only if it lies in the planes perpendicular to the long or short axis of a triaxial halo, or in the equatorial or polar planes of a spheroidal halo. In any other orientation, then the disc thickness doubles on ∼5 Gyr time-scales and so must have been born with an implausibly small vertical scaleheight.

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Crossref · 10.1093/mnras/stt1253

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  • At larger distances, the flattening of the DM halo becomes important and can affect the dynamics of halo tracers.

    “At larger distances, the flattening of the DM halo becomes important and can affect the dynamics of halo tracers”

    From The milky way total mass profile as inferred from Gaia DR2 (2020) · cites this paper as Bowden et al. 2013

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Authors
Bowden, A., Evans, N. W., & Belokurov, V.
Affiliations
University of Cambridge (GB)
Corresponding author
  • Bowden, A.
  • Evans, N. W.
  • Belokurov, V.
Venue
Monthly Notices of the Royal Astronomical Society
Published
2013-09-03
Volume
435
Issue
2
Pages
928-933
ISSN
  • 0035-8711 (ISSN-L)
  • 1365-2966
OpenAlex
W2056273051
Cited by
29
References
27
Citations by year
2024: 1 · 2022: 1 · 2020: 4 · 2019: 4 · 2018: 3 · 2017: 2 · 2016: 5 · 2015: 4 · 2014: 4 · 2013: 1
FWCI
2.47
Type
journal article
Language
en
Open access
Locations
  • Monthly Notices of the Royal Astronomical Society (publishedVersion)
  • arXiv (Cornell University) (submittedVersion)
  • arXiv (Cornell University)
Funders
Science and Technology Facilities Council (ST/H00243X/1, ST/K000985/1, ST/K501918/1)
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 › Cosmology and Gravitation Theories
Keywords
Navarro-Frenk-White halo, M31, disk stability, halo ellipticity, dark matter halos

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