Speaker
Mr
Ali Rahmati
(Leiden Observatory)
Description
In this talk, I will show that cosmological simulations of galaxy formation that match the cosmic star formation history are also capable of reproducing the observed HI distribution when they are combined with accurate radiative transfer calculations. I will discuss the impact of different ionizing processes (i.e., the UV background, recombination radiation, collisional ionization and local stellar radiation) on the HI column density distribution over more than 12 billion years of evolution from z = 5 to z = 0. I will also talk about the connection between the so-called Damped Lyα and Lyman limit systems and their host galaxies in the simulations. This talk is based on my recent publications: Rahmati et al. 2013a; 2013b (MNRAS in press) and Rahmati et al. 2013c (in prep.).
