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Article Dans Une Revue Monthly Notices of the Royal Astronomical Society Année : 2018

Stability of Satellite Planes in M31 II: Effects of the Dark Subhalo Population

Nuwanthika Fernando
  • Fonction : Auteur
Veronica Arias
  • Fonction : Auteur
Geraint F. Lewis
  • Fonction : Auteur
Rodrigo A. Ibata
Chris Power
  • Fonction : Auteur

Résumé

The planar arrangement of nearly half the satellite galaxies of M31 has been a source of mystery and speculation since it was discovered. With a growing number of other host galaxies showing these satellite galaxy planes, their stability and longevity have become central to the debate on whether the presence of satellite planes are a natural consequence of prevailing cosmological models, or represent a challenge. Given the dependence of their stability on host halo shape, we look into how a galaxy plane's dark matter environment influences its longevity. An increased number of dark matter subhaloes results in increased interactions that hasten the deterioration of an already-formed plane of satellite galaxies in spherical dark haloes. The role of total dark matter mass fraction held in subhaloes in dispersing a plane of galaxies presents non-trivial effects on plane longevity as well. But any misalignment of plane inclines to major axes of flattened dark matter haloes lead to their lifetimes being reduced to ≤3 Gyr. Distributing ≥40 per cent of total dark mass in subhaloes in the overall dark matter distribution results in a plane of satellite galaxies which is prone to change through the 5-Gyr integration time period.

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Dates et versions

hal-01645284 , version 1 (23-11-2017)

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Citer

Nuwanthika Fernando, Veronica Arias, Geraint F. Lewis, Rodrigo A. Ibata, Chris Power. Stability of Satellite Planes in M31 II: Effects of the Dark Subhalo Population. Monthly Notices of the Royal Astronomical Society, 2018, 473 (2), pp.2212-2221. ⟨10.1093/mnras/stx2483⟩. ⟨hal-01645284⟩
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