We use high resolution N-body dark matter simulations and L-Galaxies semi-analytical galaxy formation models to explore the high-z galaxy properties and estimate the budget of ionizing photons. The parameters within L-Galaxies are obtained using a Markov Chain Monte Carlo (MCMC) method with high-z galaxy observations from JWST and other telescopes. We consider two versions of L-Galaxies with and without dust correction on galaxy UV luminosities. With the best-fit parameters, both L-Galaxies 2015 and L-Galaxies 2020 reproduce well observations of UV luminosity functions, stellar mass functions, star formation rate densities and ionizing photon emission efficiency. With the assumption of escape fraction of 20%, all models produce more ionizing photons than the number of Hydrogen atoms in the Universe at z>6. The inclusion of dust correction within MCMC results in higher star formation efficiency, which predicts ∼50% more ionizing photons, with better consistency between the predicted stellar mass functions and observations.
@article{arxiv.2504.19422,
title = {Constraints on the galaxy formation models during epoch of reionization with high redshift observations},
author = {Qing-Bo Ma and Xiao-Rong Chen and Ming Li and Qi Guo and Benedetta Ciardi and Anshuman Acharya and Xin Wang},
journal= {arXiv preprint arXiv:2504.19422},
year = {2025}
}