Speaker
Description
The influx of data from JWST, coupled with advancements in radiative transfer simulations, is improving our understanding of cosmic reionization. Recent findings suggest a late and rapid reionization model leads to the best fit to current observations. However, the identification of high-redshift AGNs and LAEs challenge these models, necessitating a reevaluation of AGNs and galaxies' roles in this epoch. In this talk, I will present new results from fast GPU-accelerated radiative transfer simulations with the code ATON utilizing the SHERWOOD suite of hydrodynamical simulations. We have augmented ATON to include helium, expand across multiple frequency bins, and simulate the contribution of both galaxies and AGN to the ionizing emissivity across a broad spectrum of reionization histories extending from $z=15-20$ to the end of reionization at $z\approx5$. Our simulations are all calibrated to reproduce the latest Lyman-alpha forest opacity observations to ensure an accurate end to reionization. The presentation will centre on the incorporation and properties of quasars within these simulations, their influence on ionizing emissivity and reionization history. Additionally, the talk will delve into the morphology of ionized regions, as well as the thermal state of the intergalactic medium in QSO assisted models of reionization, with a view to interpret JWST observations of reionization-epoch galaxies and AGN.
