Speaker
Description
Since JWST began providing breakthrough results in July 2022, our understanding of early galaxy formation has been challenged. While HST enabled us to observe galaxies out to z ~ 10, JWST has pushed this boundary further, revealing an unexpected overabundance of massive galaxies at z > 10. This discovery challenges theoretical models, implying rapid evolution of dark matter halos during this epoch. One key topic that has attracted significant attention is the UV luminosity function (LF) of early galaxies for eg. the origin of its variability and boosted bright end. Among various explanations, the stochasticity of star formation stands out most promising. In this work, we investigate the impact of the star formation rate (SFR) variability on the LF of high-z galaxies using the suite of radiation hydrodynamic simulations “SPICE” (Bhagwat et al. 2024), which feature different implementations of supernova feedback, resulting in diverse star formation histories. I will discuss our immediate results extracted from these simulations. We also post-process SPICE to quantify the scatter in the MUV,1500 - Mhalo plane ie. σUV, as frequently cited in existing literature. Additionally, I will explore how these variabilities influence the morphologies of individual galaxies. I look forward to sharing these insights in my talk.
