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Subhaloes gone Notts: the clustering properties of subhaloes

Pujol, Arnau; Gaztanaga, Enrique; Giocoli, Carlo; Knebe, Alexander; Pearce, Frazer R.; Skibba, Ramin A.; Ascasibar, Yago; Behroozi, Peter; Elahi, Pascal; Han, Jiaxin; Lux, Hanni; Muldrew, Stuart I.; Neyrinck, Mark; Onions, Julian; Potter, Doug; Tweed, Dylan

Authors

Arnau Pujol

Enrique Gaztanaga

Carlo Giocoli

Alexander Knebe

Frazer R. Pearce

Ramin A. Skibba

Yago Ascasibar

Peter Behroozi

Pascal Elahi

Jiaxin Han

Hanni Lux

Stuart I. Muldrew

Mark Neyrinck

Julian Onions

Doug Potter

Dylan Tweed



Abstract

We present a study of the substructure finder dependence of subhalo clustering in the Aquarius Simulation. We run 11 different subhalo finders on the haloes of the Aquarius Simulation and study their differences in the density profile, mass fraction and two-point correlation function of subhaloes in haloes. We also study the mass and vmax dependence of subhalo clustering. As the Aquarius Simulation has been run at different resolutions, we study the convergence with higher resolutions. We find that the agreement between finders is at around the 10 per cent level inside R200 and at intermediate resolutions when a mass threshold is applied, and better than 5 per cent when vmax is restricted instead of mass. However, some discrepancies appear in the highest resolution, underlined by an observed resolution dependence of subhalo clustering. This dependence is stronger for the smallest subhaloes, which are more clustered in the highest resolution, due to the detection of subhaloes within subhaloes (the sub-subhalo term). This effect modifies the mass dependence of clustering in the highest resolutions. We discuss implications of our results for models of subhalo clustering and their relation with galaxy clustering.

Journal Article Type Article
Publication Date Mar 11, 2014
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Oxford University Press
Peer Reviewed Peer Reviewed
Volume 438
Issue 4
APA6 Citation Pujol, A., Gaztanaga, E., Giocoli, C., Knebe, A., Pearce, F. R., Skibba, R. A., …Tweed, D. (2014). Subhaloes gone Notts: the clustering properties of subhaloes. Monthly Notices of the Royal Astronomical Society, 438(4), https://doi.org/10.1093/mnras/stt2446
DOI https://doi.org/10.1093/mnras/stt2446
Keywords methods: numerical, galaxies: haloes, cosmology: theory
Publisher URL https://academic.oup.com/mnras/article-lookup/doi/10.1093/mnras/stt2446
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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