Princeton University Thunch Talk
Semi-analytic satellites - Satellite evolution in Milky Way-like environments via a robust CGM co-evolution model
The evolution of satellite galaxies is an unsolved problem in galaxy formation. Recent observations such as the SAGA and ELVES surveys find tension in HI contents and star formation of satellites around their central host galaxies when compared to our own local environment, the Milky Way. These processes are potentially highly influenced by the host's circumgalactic medium (CGM), and to constrain these cases requires accurate and fast modeling of satellite-host interactions. In this work, we present our methodology for evolving z = 0 surviving satellites alongside their central galaxy in Sapphire, a semi analytic CGM co-evolution model of galaxy formation. We have added interstellar medium (ISM) structure, CGM and ISM ram pressure stripping, as well as satellite pre-enrichment via their host galaxy. Utilizing the Symphony zoom-in dark matter halo suite, we are able to reproduce observations such as the cumulative satellite stellar mass function and the stellar mass-metallicity relation of the local Milky Way satellites from the ultrafaints to the SMC and LMC. Our added framework is highly modular and sets the stage for multi-scale modeling and fast, robust Bayesian inference of satellite-related physical parameters.