The Simulated CGM at 200 pc

          @misc{ pirsa_PIRSA:25070048,
            doi = {10.48660/25070048},
            url = {https://pirsa.org/25070048},
            author = {Lucchini, Scott},
            keywords = {Cosmology},
            language = {en},
            title = {The Simulated CGM at 200 pc},
            publisher = {Perimeter Institute},
            year = {2025},
            month = {jul},
            note = {PIRSA:25070048 see, \url{https://pirsa.org}}
          }
          

Abstract

Simulations with fixed spatial resolution are an excellent tool to investigate the interplay between different phases of gas in and around galaxies because they mitigate the disparity in cell sizes due to density variations in traditional mass-based refinement schemes. Additionally, the moving-mesh technique implemented in Arepo has been shown to minimize numerical mixing and instability suppression. In this talk, I will introduce a new suite of cosmological zoom simulations with 200 pc resolution covering the inner CGM of a Milky Way-mass galaxy, utilizing the full IllustrisTNG galaxy formation model. At this high resolution, we find increased turbulent velocities, many small, cool cloudlets, and a smooth and homogeneous hot phase. I will outline these results and discuss the implications for high- and intermediate-velocity cloud studies and gas mixing in the CGM.