Magnetic fields and cosmic rays in cosmological simulations

          @misc{ pirsa_PIRSA:25070068,
            doi = {10.48660/25070068},
            url = {https://pirsa.org/25070068},
            author = {},
            keywords = {},
            language = {en},
            title = {Magnetic fields and cosmic rays in cosmological simulations},
            publisher = {Perimeter Institute},
            year = {2025},
            month = {jul},
            note = {PIRSA:25070068 see, \url{https://pirsa.org}}
          }
          

Abstract

Using zoom-in cosmological simulations, I will discuss some of the physical and observable properties of the circumgalactic medium (CGM). I will focus on non-thermal physical processes and how they impact the galactic ecosystem. The presence of magnetic fields and feedback from relativistic cosmic rays changes the flow of gas in the CGM, affecting the efficiency of outflows driven by stars or supermassive black holes as well as the turbulence-driven mixing in the CGM. This also affects our simulations’ predictions for neutral hydrogen and metal ions, observable through 21 cm emission and quasar absorption lines. I will show how these effects of magnetic fields and cosmic rays vary across a wide range in halo mass, from dwarf galaxies to galaxy groups.