nIFTy galaxy cluster simulations – IV. Quantifying the influence of baryons on halo properties

Cui, Weiguang and Power, Chris and Knebe, Alexander and Kay, Scott T. and Sembolini, Federico and Elahi, Pascal J. and Yepes, Gustavo and Pearce, Frazer and Cunnama, Daniel and Beck, Alexander M. and Vecchia, Claudio Dalla and Davé, Romeel and February, Sean and Huang, Shuiyao and Hobbs, Alex and Katz, Neal and McCarthy, Ian G. and Murante, Giuseppe and Perret, Valentin and Puchwein, Ewald and Read, Justin I. and Saro, Alexandro and Teyssier, Romain and Thacker, Robert J. (2016) nIFTy galaxy cluster simulations – IV. Quantifying the influence of baryons on halo properties. Monthly Notices of the Royal Astronomical Society, 458 (4). pp. 4052-4073. ISSN 1365-2966

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Abstract

Building on the initial results of the nIFTy simulated galaxy cluster comparison, we compare and contrast the impact of baryonic physics with a single massive galaxy cluster, run with 11 state-of-the-art codes, spanning adaptive mesh, moving mesh, classic and modern smoothed particle hydrodynamics (SPH) approaches. For each code represented we have a dark-matter-only (DM) and non-radiative (NR) version of the cluster, as well as a full physics (FP) version for a subset of the codes. We compare both radial mass and kinematic profiles, as well as global measures of the cluster (e.g. concentration, spin, shape), in the NR and FP runs with that in the DM runs. Our analysis reveals good consistency ⪅20 per cent) between global properties of the cluster predicted by different codes when integrated quantities are measured within the virial radius R200. However, we see larger differences for quantities within R2500, especially in the FP runs. The radial profiles reveal a diversity, especially in the cluster centre, between the NR runs, which can be understood straightforwardly from the division of codes into classic SPH and non-classic SPH (including the modern SPH, adaptive and moving mesh codes); and between the FP runs, which can also be understood broadly from the division of codes into those that include active galactic nucleus feedback and those that do not. The variation with respect to the median is much larger in the FP runs with different baryonic physics prescriptions than in the NR runs with different hydrodynamics solvers.

Item Type: Article
Keywords: methods: numerical, galaxies: clusters: general, galaxies: evolution, galaxies: formation, galaxies: haloes, cosmology: theory
Schools/Departments: University of Nottingham, UK > Faculty of Science > School of Physics and Astronomy
Identification Number: 10.1093/mnras/stw603
Depositing User: Eprints, Support
Date Deposited: 03 May 2017 15:06
Last Modified: 05 May 2017 06:22
URI: http://eprints.nottingham.ac.uk/id/eprint/42482

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