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nIFTy galaxy cluster simulations I: dark matter & non-radiative models

Sembolini, F and Yepes, G and Pearce, FR and Knebe, A and Kay, ST and Power, C and Cui, W and Beck, AM and Borgani, S and Vecchia, CD and Davé, R and Elahi, PJ and February, S and Huang, S and Hobbs, A and Katz, N and Lau, E and McCarthy, IG and Murante, G and Nagai, D and Nelson, K and Newton, RDA and Puchwein, E and Read, JI and Saro, A and Schaye, J and Thacker, RJ (2016) nIFTy galaxy cluster simulations I: dark matter & non-radiative models. Monthly Notices of the Royal Astronomical Society, 457 (4). pp. 4063-4080. ISSN 0035-8711

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Abstract

We have simulated the formation of a galaxy cluster in a $\Lambda$CDM universe using twelve different codes modeling only gravity and non-radiative hydrodynamics (\art, \arepo, \hydra\ and 9 incarnations of GADGET). This range of codes includes particle based, moving and fixed mesh codes as well as both Eulerian and Lagrangian fluid schemes. The various GADGET implementations span traditional and advanced smoothed-particle hydrodynamics (SPH) schemes. The goal of this comparison is to assess the reliability of cosmological hydrodynamical simulations of clusters in the simplest astrophysically relevant case, that in which the gas is assumed to be non-radiative. We compare images of the cluster at $z=0$, global properties such as mass, and radial profiles of various dynamical and thermodynamical quantities. The underlying gravitational framework can be aligned very accurately for all the codes allowing a detailed investigation of the differences that develop due to the various gas physics implementations employed. As expected, the mesh-based codes ART and AREPO form extended entropy cores in the gas with rising central gas temperatures. Those codes employing traditional SPH schemes show falling entropy profiles all the way into the very centre with correspondingly rising density profiles and central temperature inversions. We show that methods with modern SPH schemes that allow entropy mixing span the range between these two extremes and the latest SPH variants produce gas entropy profiles that are essentially indistinguishable from those obtained with grid based methods.

Item Type: Article
Additional Information: This is a pre-copyedited, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record nIFTy galaxy cluster simulations I: dark matter & non-radiative models is available online at: http://dx.doi.org/10.1093/mnras/stw250
Uncontrolled Keywords: astro-ph.CO; astro-ph.CO
Subjects: Q Science > QB Astronomy
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press
Related URLs:
Date Deposited: 06 Jan 2016 12:54
Last Modified: 31 Mar 2016 08:56
URI: http://researchonline.ljmu.ac.uk/id/eprint/2521

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