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arXiv · 2504.19422

Constraints on the galaxy formation models during epoch of reionization with high redshift observations

Qing-Bo Ma·Xiao-Rong Chen·Ming Li·Qi Guo·Benedetta Ciardi·Anshuman Acharya·Xin Wang
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Abstract

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 $\sim 50\%$ more ionizing photons, with better consistency between the predicted stellar mass functions and observations.

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Qing-Bo Ma, Xiao-Rong Chen, Ming Li, Qi Guo, Benedetta Ciardi, Anshuman Acharya, Xin Wang. 2025-04-28. Constraints on the galaxy formation models during epoch of reionization with high redshift observations. https://doi.org/10.3847/1538-4357%2Fadd015

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