The Co-evolution of Dwarf Galaxies and Their Circumgalactic Medium Across Cosmic Time

Pei-Cheng Tung^1,2*, Ke-Jung Chen¹

¹Institute of Astronomy and Astrophysics, Academia Sinica, Taipei, Taiwan
²Department of Physics, National Taiwan University, Taipei, Taiwan

* Presenter:Pei-Cheng Tung, email:pctung@asiaa.sinica.edu.tw

During the evolution of a dwarf galaxy, the interaction and the co-evolution between the CGM and the dwarf galaxy itself is crucial for the evolutionary history. However, the co-evolution of dwarf galaxies and their CGM remains unclear. In this study, we present high-resolution hydrodynamical simulations for 1.5 Gyr with GIZMO code. To take the cosmic environment into account, 6 isolated dwarf galaxies with Mvir ≈ 5e10 Msun are selected from IllustrisTNG and boost its original resolution by a factor of ~100 via a super-Lagrangian refinement scheme. Our results show the evolution of multiphase CGM and its metal content is sensitive to the redshift of dwarf galaxies. The accretion of CGM onto galaxies play a key role in driving the star formation (20%-50%) and replenishing the total mass (40-70%) in the disk.

Keywords: Dwarf galaxy, Cold accretion, Galaxy evolution, Circumgalactic Medium, Computational astrophysics