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The mean free path of hydrogen ionizing photons during the epoch of reionization
Alireza Rahmati, Joop Schaye
We use the Aurora radiation-hydrodynamical simulations to study the mean free path (MFP) for hydrogen ionizing photons during the epoch of reionization. We directly measure the MFP…
The distribution of neutral hydrogen around high-redshift galaxies and quasars in the EAGLE simulation
Alireza Rahmati, Joop Schaye, Richard G. Bower +4
The observed high covering fractions of neutral hydrogen (HI) with column densities above around Lyman-Break Galaxies (LBGs) and bright quasars at redsh…
Predictions for the relation between strong HI absorbers and galaxies at redshift 3
Alireza Rahmati, Joop Schaye
We combine cosmological, hydrodynamical simulations with accurate radiative transfer corrections to investigate the relation between strong HI absorbers (N_HI >~ 10^17 /cm^2) and g…
The effect of recombination radiation on the temperature and ionization state of partially ionized gas
Milan Raičević, Andreas H. Pawlik, Joop Schaye +1
A substantial fraction of all ionizing photons originate from radiative recombinations. However, in radiative transfer calculations this recombination radiation is often assumed to…
Stars were born in significantly denser regions in the early Universe
Maryam Shirazi, Jarle Brinchmann, Alireza Rahmati
The density of the warm ionized gas in high-redshift galaxies is known to be higher than what is typical in local galaxies on similar scales. At the same time, the mean global prop…
The impact of local stellar radiation on the HI column density distribution
Alireza Rahmati, Joop Schaye, Andreas H. Pawlik +1
It is often assumed that local sources of ionizing radiation have little impact on the distribution of HI in the post-reionization Universe. While this is a good assumption for the…