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

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

Authors

Kai Hoffmann

Susana Planelles

Enrique Gaztanaga

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

Andres N. Ruiz

Mario A. Sgro



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.

Journal Article Type Article
Publication Date Aug 1, 2014
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Oxford University Press (OUP)
Peer Reviewed Peer Reviewed
Volume 442
Issue 2
APA6 Citation Hoffmann, K., Planelles, S., Gaztanaga, E., Knebe, A., Pearce, F. R., Lux, H., …Sgro, M. A. (2014). Subhaloes gone Notts: subhaloes as tracers of the dark matter halo shape. Monthly Notices of the Royal Astronomical Society, 442(2), doi:10.1093/mnras/stu933
DOI https://doi.org/10.1093/mnras/stu933
Keywords methods: numerical, galaxies: haloes, cosmology: miscellaneous
Publisher URL https://academic.oup.com/mnras/article-lookup/doi/10.1093/mnras/stu933
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf





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