[View Abstracts by Session]

Session: Extragalactic Astronomy and Astrophysics

Name: Prof. Antonios Katsianis (SYSU / SJTU)
Coauthors: No coauthors were included.
Type: Oral
Title: The star formation of galaxies for the last 13 billion years.
Abstract:

In this talk I present the evolution of the star formation rates (SFRs) and stellar masses of galaxies for the last 13 billion years of the Universe both in observations and cosmological simulations. First, I employ cosmological simulations combined with radiative transfer and demonstrate that the adopted methodology / indicator (e.g. IR, UV, Ha, SED) to obtain the observed galaxy SFRs and stellar masses are bound to heavily affect the derived properties something that I further show by comparing results from different observational studies. In addition, I demonstrate that state-of-the-art simulations (EAGLE, TNG, Simba, semi-analytic models) are found to suffer from severe limitations mostly connected to resolution effects and the adopted feedback prescriptions which have to be reconsidered. Last, I demonstrate that the observed star formation rate density can be described by only two parameters and a function that resembles a Gamma distribution, like numerous other physical processes in Nature (from Economy to Biology) while it has a plateau from z = 1-4 and not a strong peak at z = 2 (Katsianis et al. 2021). I proceed to demonstrate that Dark matter halo growth follows the same Gamma growth pattern using an analysis of Mass accretion Histories (Katsianis et al. 2023). I will present where we agree and disagree as community via Polls from the EAS 2021 and how these opinions evolved in the last 2 years.