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Title: Subhaloes gone Notts: subhaloes as tracers of the dark matter halo shape
Authors: Hoffmann, K.
Planelles, S.
Gaztañaga, E.
Knebe, A.
Pearce, F. R.
Lux, H.
Onions, J.
Muldrew, Stuart I.
Elahi, P.
Behroozi, P.
Ascasibar, Y.
Han, J.
Maciejewski, M.
Merchan, M. E.
Neyrinck, M.
Ruiz, A. N.
Sgro, M. A.
First Published: 11-Jun-2014
Publisher: Oxford University Press (OUP), Royal Astronomical Society
Citation: Monthly Notices of the Royal Astronomical Society, 442, pp. 1197-1210
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.
DOI Link: 10.1093/mnras/stu933
ISSN: 0035-8711
eISSN: 1365-2966
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Archived with reference to SHERPA/RoMEO and publisher website. This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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