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Proposing Institution

Max-Planck-Institut für Astrophysik
Project Manager

Enrico Garaldi
Karl-Schwarzschild-Str. 1
85741 Garching
Abstract
Upcoming facilities like SKA, HERA, WFIRST, and JWST will unleash a flood of high redshift observational data that will usher the study of the Epoch of Reionization (EoR) into a new era. It is therefore of primary importance for theoretical models to achieve sufficient physical fidelity to make accurate predictions and help the interpretation of the observational results. At present, numerical radiation-hydrodynamic simulations offer the most accurate and realistic theoretical models of the EoR. We propose an ambitious simulation campaign to understand this era. The aim is to run a series of simulations with a lean version of the Illustris galaxy formation model coupled with self-consistent radiative transfer and dust modelling. In addition, we will post-process these simulations with a Lyman-alpha radiative-transfer code, in order to extract synthetic observations that can provide guidance and a deeper understanding of future observational campaigns.The flagship simulation will be a ~100 Mpc box with 3300^3 resolution elements. This setup allows us to resolve the `atomic cooling halos', important sources of ionizing photons. Such simulation(s) will probe the faint end of the luminosity function, allowing us to make accurate predictions for JWST thanks to the realistic and well-tested IllustrisTNG galaxy formation model. Additionally, smaller ancillary simulations will explore different physical models and galaxy properties (such as escape fractions, galactic and stellar spectra, dust opacities).Simulations like the one we are proposing here will enable researchers to characterize the properties of the 21cm emission as a function of galactic and sub-galactic properties, a result of key importance in light of forthcoming observational campaign targeting the 21cm emission line. The IllustrisTNG model has proven able to produce realistic galaxy populations. Coupling this with a careful treatment of radiation transport will enable us to thoroughly investigate the properties of the Lyman-alpha emitters, as well as the assembly and the features of the first galaxies. This is of key importance for the upcoming JWST telescope, designed to investigate the high-redshift Universe. Finally, our simulations will produce a reionization history based on realistic galaxies, enabling an in-depth, physically-motivated investigation of the reionization and post-reionization intergalactic medium and its features.

Impressum, Conny Wendler