Resumen de CLUES from The Three Hundred: A two-way approach to the influence of baryonic physics on galaxy formation

Robert Adriel Mostoghiu

• Galaxy formation is one of the greatest challenges of modern astrophysics.To alleviate this issue we use numerical simulations.

  This Thesis presents a compendium of results on baryonic processes in galaxy formation from two different approaches that are complementary to each other. The first approach uses a dataset of numerically simulated galaxy clusters to: 1) validate the use of such dataset, 2) study the redshift evolution of the mass density radial profiles of the clusters, and 3) explore the environmental effects of clusters on the stellar kinematics of infalling haloes.

  The second approach uses constrained simulations of the Local Universe to investigate two observational open problems: 1) the reversed radial stellar age gradient observed in the outskirts of the Triangulum (i.e. M33) galaxy, and 2) the star formation histories of satellite galaxies of the numerical Local Group after infall.

  The cluster analysis reveals that their median mass density profiles evolution is self-similar, to a degree that depends on their dynamical state at z=0 and their formation time; and that the central stellar kinematics of such haloes is shielded from tidal effects, despite the mass-loss they experienced. Constrained simulations show us that the age reversal of M33 can be achieved through accretion of old stars from mergers with satellites, and stellar migration. Analysing satellites of the Local Group, we find star formation bursts in the satellites and in the central galaxy that correlate with the pericentric passages of the satellites, tied to the amount of cold gas in each satellite at infall time and their orbit within the host.