# Strong stellar-driven outflows shape the evolution of galaxies at cosmic dawn

## TL;DR

This study uses the GAEA galaxy evolution model to demonstrate that strong stellar-driven outflows significantly influence galaxy formation and evolution during cosmic dawn, successfully matching observed luminosity functions and star formation rates up to high redshifts.

## Contribution

The paper introduces an improved galaxy evolution model with strong stellar feedback that accurately reproduces galaxy properties from redshift 4 to 10, extending previous work to earlier cosmic times.

## Key findings

- GAEA reproduces UV and optical luminosity functions up to z~10.
- Model matches observed galaxy stellar mass function up to z~7.
- Dust attenuation levels are consistent with recent estimates.

## Abstract

We study galaxy mass assembly and cosmic star formation rate (SFR) at high-redshift (z$\gt$4), by comparing data from multiwavelength surveys with predictions from the GAlaxy Evolution and Assembly (GAEA) model. GAEA implements a stellar feedback scheme partially based on cosmological hydrodynamical simulations, that features strong stellar driven outflows and mass-dependent timescale for the re-accretion of ejected gas. In previous work, we have shown that this scheme is able to correctly reproduce the evolution of the galaxy stellar mass function (GSMF) up to $z\sim3$. We contrast model predictions with both rest-frame Ultra-Violet (UV) and optical luminosity functions (LF), which are mostly sensible to the SFR and stellar mass, respectively. We show that GAEA is able to reproduce the shape and redshift evolution of both sets of LFs. We study the impact of dust on the predicted LFs and we find that the required level of dust attenuation is in qualitative agreement with recent estimates based on the UV continuum slope. The consistency between data and model predictions holds for the redshift evolution of the physical quantities well beyond the redshift range considered for the calibration of the original model. In particular, we show that GAEA is able to recover the evolution of the GSMF up to z$\sim$7 and the cosmic SFR density up to z$\sim$10.