The Origin and Fate of the Multiphase Circumgalactic Medium of Disc Galaxies Using High-Resolution Hydrodynamical Simulations

In this Thesis, we studied the multiphase gaseous haloes surrounding low-redshift disc galaxies. Through high-resolution hydrodynamical simulations, we investigated how various physical processes, such as gas radiative cooling, thermal conduction, gas photoionization by extragalactic sources, affect the interaction between the different gas phases in the galactic haloes. The final goal of this work is to shed light on the interplay between disc galaxies and their surrounding environments, a crucial issue in the context of galaxy evolution.