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nIFTy galaxy cluster simulations – V. Investigation of the cluster infall region


Jake Arthur

Frazer R. Pearce

Meghan E. Gray

Pascal J. Elahi

Alexander Knebe

Alexander M. Beck

Weiguang Cui

Daniel Cunnama


Sean February

Shuiyao Huang

Neal Katz

Scott T. Kay

Ian G. McCarthy

Giuseppe Murante

Valentin Perret

Chris Power

Ewald Puchwein

Alexandro Saro

Federico Sembolini

Romain Teyssier

Gustavo Yepes


We examine the properties of the galaxies and dark matter haloes residing in the cluster infall region surrounding the simulated _ cold dark matter galaxy cluster studied by Elahi et al. at z = 0. The 1.1 × 1015 h−1M_ galaxy cluster has been simulated with eight different hydrodynamical codes containing a variety of hydrodynamic solvers and sub-grid schemes. All models completed a dark-matter-only, non-radiative and full-physics run from the same initial conditions. The simulations contain dark matter and gas with mass resolution mDM = 9.01 × 108 h−1M_ and mgas = 1.9 × 108 h−1M_, respectively. We find that the synthetic cluster is surrounded by clear filamentary structures that contain ∼60 per cent of haloes in the infall region with mass ∼1012.5–1014 h−1M_, including 2–3 group-sized haloes (>1013 h−1M_). However, we find that only ∼10 per cent of objects in the infall region are sub-haloes residing in haloes, which may suggest that there is not much ongoing pre-processing occurring in the infall region at z = 0. By examining the baryonic content contained within the haloes, we also show that the code-to-code scatter in stellar fraction across all halo masses is typically ∼2 orders of magnitude between the two most extreme cases, and this is predominantly due to the differences in sub-grid schemes and calibration procedures that each model uses. Models that do not include active galactic nucleus feedback typically produce too high stellar fractions compared to observations by at least ∼1 order of magnitude.


Arthur, J., Pearce, F. R., Gray, M. E., Elahi, P. J., Knebe, A., Beck, A. M., …Yepes, G. (2017). nIFTy galaxy cluster simulations – V. Investigation of the cluster infall region. Monthly Notices of the Royal Astronomical Society, 464(2), 2027-2038.

Journal Article Type Article
Acceptance Date Sep 22, 2016
Online Publication Date Sep 23, 2016
Publication Date Jan 31, 2017
Deposit Date May 3, 2017
Publicly Available Date May 3, 2017
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 464
Issue 2
Pages 2027-2038
Keywords methods: numerical, galaxies: clusters: general, dark matter
Public URL
Publisher URL
Additional Information This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.


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