Subhaloes gone Notts: Subhaloes as tracers of the dark matter halo shape

Kai Hoffmann, Susana Planelles, Enrique Gaztañaga, Alexander Knebe, Frazer R. Pearce, Hanni Lux, Julian Onions, Stuart I. Muldrew, Pascal Elahi, Peter Behroozi, Yago Ascasibar, Jiaxin Han, Michal Maciejewski, Manuel E. Merchan, Mark Neyrinck, Andrés N. Ruiz, Mario A. Sgro

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

We study the shapes of subhalo distributions from four dark-matter-only simulations of Milky Way-type haloes. Comparing the shapes derived from the subhalo distributions at high resolution to those of the underlying dark matter fields, we find the former to be more triaxial if the analysis is restricted to massive subhaloes. For three of the four analysed haloes, the increased triaxiality of the distributions of massive subhaloes can be explained by a systematic effect caused by the low number of objects. Subhaloes of the fourth halo show indications for anisotropic accretion via their strong triaxial distribution and orbit alignment with respect to the dark matter field. These results are independent of the employed subhalo finder. Comparing the shape of the observed Milky Way satellite distribution to those of high-resolution subhalo samples from simulations, we find agreement for samples of bright satellites, but significant deviations if faint satellites are included in the analysis. These deviations might result from observational incompleteness.

Original languageEnglish (US)
Pages (from-to)1197-1210
Number of pages14
JournalMonthly Notices of the Royal Astronomical Society
Volume442
Issue number2
DOIs
StatePublished - Jun 2014
Externally publishedYes

Keywords

  • Cosmology: miscellaneous
  • Galaxies: haloes
  • Methods: numerical

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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