Poster Presentation

Coevolution of Dwarf Galaxies and Their Circumgalactic Medium Across Cosmic Time

Author(s): Pei-Cheng Tung (ASIAA) and Ke-Jung Chen (ASIAA)

Presenter: Pei-Cheng Tung (ASIAA)

Dwarf galaxies are thought of as the building blocks of large galaxies such as our Milky Way. This talk presents new high-resolution hydrodynamical simulations of dwarf galaxies and their intergalactic medium with the GIZMO code. Our simulations consider the key physical processes of galaxy evolution, such as gas cooling, chemistry, and stellar and black hole feedback. Unlike the previous work, the initial conditions of our simulations taking the dwarf galaxies of 2 − 5 × 1010 M⊙ from the realistic cosmology simulations, IllustrisTNG. We further increase the original resolution of IllustrisTNG by a factor of ∼ 100 via a particle splitting scheme.
Our results show that the evolution of complex multiphase CGM and its metal content is sensitive to the redshift of dwarf galaxies. The accretion of CGM into dwarf galaxies plays a key role in providing 20% − 50% of the star-forming gas and replenishing 40% − 70% of the total mass in the galactic disk. Furthermore, the accretion history of supermassive black holes in the centers of high-z dwarf galaxies shows episodic patterns with high-accreting states close to ∼ 10% of the Eddington mass accretion rate, implying the rapid growth of supermassive black holes in the early universe, which may be revealed by the coming observations from the James Webb Space Telescope (JWST).