Subhaloes gone Notts: the clustering properties of subhaloes

Pujol, Arnau and Gaztanaga, Enrique and Giocoli, Carlo and Knebe, Alexander and Pearce, Frazer R. and Skibba, Ramin A. and Ascasibar, Yago and Behroozi, Peter and Elahi, Pascal and Han, Jiaxin and Lux, Hanni and Muldrew, Stuart I. and Neyrinck, Mark and Onions, Julian and Potter, Doug and Tweed, Dylan (2014) Subhaloes gone Notts: the clustering properties of subhaloes. Monthly Notices of the Royal Astronomical Society, 438 (4). pp. 3205-3221. ISSN 1365-2966

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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.

Item Type: Article
Keywords: methods: numerical, galaxies: haloes, cosmology: theory
Schools/Departments: University of Nottingham, UK > Faculty of Science > School of Physics and Astronomy
Identification Number: 10.1093/mnras/stt2446
Depositing User: Eprints, Support
Date Deposited: 09 May 2017 10:30
Last Modified: 09 May 2017 10:35
URI: http://eprints.nottingham.ac.uk/id/eprint/42643

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