Star formation rate in simulated clusters

RASIA, ELENA; BASSINI, L.; VALENTINI, MILENA; BIFFI, V.; BORGANI, STEFANO; DOLAG, K.; GRANATO, G L; MURANTE, G.; RAGAGNIN, A.; RAGONE FIGUEROA, C.; TAFFONI, G.; TORNATORE, L.

Congreso; Astrophysics with the INAF CINECA MoU 2017-2020; 2020

The star formation rate (SFR) of simulated galaxy clusters is compared to recentobservational studies atz=0 andz∼2. In particular, we analyze a set of zoom-in cosmologicalhydrodynamical simulations centered on twelve clusters and carried out with the GADGET-3 TreePM/SPH code. We find that simulated central galaxies produce an excess of stars atz=0, however atz∼2 simulations under-predict the normalization of the relation SFR?stellar mass of star forming galaxies by a factor of about 3 and are unable to reproduce theobserved starburst population. We conclude that the adopted sub-grid model for star formation(Springel & Hernquist 2003), introduced to reproduce the self-regulated evolution of quiescentgalaxies, is not suitable to describe violent events like high-redshift starbursts, independently ofthe choice of the parameters for the star formation and active-galactic-nuclei models. A moreextensive analysis is present in Bassini et al. (2020)