Comoving magnetohydrodynamic waves and a new suite of cosmological galaxy cluster simulations

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• Thomas Berlok (Niels Bohr Institute)
• Tuesday 28 May 2024, 14:00-15:00
• MR14 DAMTP and online.

If you have a question about this talk, please contact Loren E. Held.

Galaxy clusters form at the densest knots in the cosmic web and can contain thousands of individual galaxies. The space between the galaxies contains a very hot and dilute plasma, known as the intracluster medium, which can be observed with X-ray telescopes. Galaxy clusters continuously grow via accretion and mergers, which excite motions and turbulence in the intracluster medium. In this talk, I will first describe how analytic solutions for linear hydromagnetic waves can be used for testing cosmological magnetohydrodynamic (MHD) codes. I will then present PICO -Clusters, a new suite of cosmological zoom-in simulations of 25 massive (M_200,c > 10^14.9 M_sun) galaxy clusters. These simulations use the moving mesh code Arepo, the IllustrisTNG galaxy formation model and start with a weak seed magnetic field initialised at z=127, which is then evolved using comoving ideal magnetohydrodynamics. I will discuss the driving of turbulence and amplification of magnetic fields in the intracluster medium and the cluster mass dependence of the resulting amplitudes. Finally, I will present the current status of performing cosmological cluster simulations using Braginskii viscosity to model a weakly collisional intracluster medium.

This talk is part of the DAMTP Astrophysics Seminars series.

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