Talk, Chinese Science Club in Zurich, Zurich, Switzerland
This talk aims to give the general pubic an introduction about simulating galaxy formation using advanced supercomputers. This talk will cover basic concepts about galaxy formation, numerical mehods for PDEs and high performance computing tools.
Talk, The SPHINX Project Meeting, Centre de Recherche Astrophysique de Lyon, Lyon, France
I present a sub-grid turbulent dynamo model in this talk.
Talk, Ludwig Maximilian University of Munich, Munich, Germany (via Zoom)
I present a sub-grid turbulent dynamo model in this talk.
Talk, The University of Manchester, Jodrell Bank Centre for Astrophysics, Manchester, United Kingdom (via Zoom)
The magnetic field in galaxies is one of the frontiers of galaxy formation and evolution. We perform a cosmological magnetohydrodynamic (MHD) simulation of galaxy formation with adaptive mesh refinement (AMR) techniques using RAMSES code. In this project, we manage to amplify an initially very weak seed magnetic field to a final value close to equipartition via a simple sub-grid dynamo model. The amplification process features a rapid growth in the magnetic energy, which reaches saturation at the early times of the galaxy evolution. Then the magnetic field follows the fluid distribution. We analyze the magnetic field at redshift z=0 and estimate the magnetic field strength to be a few microG within the galaxy, where turbulent motion dominates. The circumgalactic medium (CGM) is also magnetized by galactic winds driven by supernova explosions and the field strength is estimated there to be a few nG in the CGM.