Barnes, DJ;
On, AYL;
Wu, K;
Kawata, D;
(2018)
SPMHD simulations of structure formation.
Monthly Notices of the Royal Astronomical Society (MNRAS)
, 476
(3)
pp. 2890-2904.
10.1093/mnras/sty400.
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Abstract
The intracluster medium of galaxy clusters is permeated by μG μG magnetic fields. Observations with current and future facilities have the potential to illuminate the role of these magnetic fields play in the astrophysical processes of galaxy clusters. To obtain a greater understanding of how the initial seed fields evolve to the magnetic fields in the intracluster medium requires magnetohydrodynamic simulations. We critically assess the current smoothed particle magnetohydrodynamic (SPMHD) schemes, especially highlighting the impact of a hyperbolic divergence cleaning scheme and artificial resistivity switch on the magnetic field evolution in cosmological simulations of the formation of a galaxy cluster using the N-body/SPMHD code GCMHD++. The impact and performance of the cleaning scheme and two different schemes for the artificial resistivity switch is demonstrated via idealized test cases and cosmological simulations. We demonstrate that the hyperbolic divergence cleaning scheme is effective at suppressing the growth of the numerical divergence error of the magnetic field and should be applied to any SPMHD simulation. Although the artificial resistivity is important in the strong field regime, it can suppress the growth of the magnetic field in the weak field regime, such as galaxy clusters. With sufficient resolution, simulations with divergence cleaning can reproduce observed magnetic fields. We conclude that the cleaning scheme alone is sufficient for galaxy cluster simulations, but our results indicate that the SPMHD scheme must be carefully chosen depending on the regime of the magnetic field.
| Type: | Article |
|---|---|
| Title: | SPMHD simulations of structure formation |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/mnras/sty400 |
| Publisher version: | https://doi.org/10.1093/mnras/sty400 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Science & Technology, Physical Sciences, Astronomy & Astrophysics, magnetic fields, MHD, methods: numerical, galaxies: clusters: general, SMOOTHED PARTICLE MAGNETOHYDRODYNAMICS, CLUSTER MAGNETIC-FIELDS, GALAXY CLUSTERS, X-RAY, COSMOLOGICAL SIMULATIONS, RADIO HALOS, ROTATION MEASURES, STEPHANS-QUINTET, SPH SIMULATIONS |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10053298 |
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