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

Arthur, Jake; Pearce, Frazer R.; Gray, Meghan E.; Elahi, Pascal J.; Knebe, Alexander; Beck, Alexander M.; Cui, Weiguang; Cunnama, Daniel; Dav�, Romeel; February, Sean; Huang, Shuiyao; Katz, Neal; Kay, Scott T.; McCarthy, Ian G.; Murante, Giuseppe; Perret, Valentin; Power, Chris; Puchwein, Ewald; Saro, Alexandro; Sembolini, Federico; Teyssier, Romain; Yepes, Gustavo

Abstract

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.

Citation

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. https://doi.org/10.1093/mnras/stw2424

• 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
• DOI: https://doi.org/10.1093/mnras/stw2424
• Keywords: methods: numerical, galaxies: clusters: general, dark matter
• Public URL: https://nottingham-repository.worktribe.com/output/837982
• Publisher URL: https://academic.oup.com/mnras/article-lookup/doi/10.1093/mnras/stw2424
• 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.