9 April 2025: Romeel Dave

Speaker: Romeel Dave (Edinburgh)

Date: Wednesday 9 April 2025

Time: 15:00

Location: Physics 3.21

How massive galaxies quench in the Simba simulations

Cosmological simulations of galaxy formation have matured rapidly in the last few years, with recent models combining structure formation, hydrodynamics, stellar and black hole growth, and associated feedback processes to accurately reproduce key demographical properties observed in the galaxy population.  Our group's Simba simulation suite includes unique input physics that have dramatic implications particularly for the growth and quenching of massive galaxies.  I will show how Simba's AGN jet feedback model dramatically impacts the surrounding circum-galactic and intergalactic medium.  Using the Hyenas zoom simulations based on Simba, I will further show how Simba's jets blow X-ray cavities as observed, depositing energy and evacuating halo gas, the first time this has been demonstrated within a full hierarchical galaxy formation context.  I will show that such feedback can at least partially explain some puzzling trends seen in the stellar-to-halo mass relation and the matter power spectrum.