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, Romeel Davé, Sean February, Shuiyao Huang, Neal Katz, Scott T. Kay, Ian G. McCarthy, Giuseppe Murante, Valentin Perret, Chris Power, Ewald Puchwein, Alexandro Saro, Federico SemboliniRomain Teyssier, Gustavo Yepes

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)
240 Downloads (Pure)


We examine the properties of the galaxies and dark matter haloes residing in the cluster infall region surrounding the simulated Λ cold dark matter galaxy cluster studied by Elahi et al. at z = 0. The 1.1 × 1015 h-1 M⊙ 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-1 M⊙ and mgas = 1.9 × 108 h-1 M⊙, 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-1 M⊙, including 2-3 group-sized haloes (>1013 h-1 M⊙). 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.
Original languageEnglish
Pages (from-to)2027-2038
Number of pages12
JournalMonthly Notices of the Royal Astronomical Society
Issue number2
Publication statusPublished - 11 Jan 2017


Dive into the research topics of 'nIFTy galaxy cluster simulations - V. Investigation of the cluster infall region'. Together they form a unique fingerprint.

Cite this