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The presence of charged dust grains is known to have a profound impact on thephysical evolution of the multiphase interstellar medium (ISM). Despite itsimportance, this process is still poorly explored in numerical simulations dueto its complex physics and the tight dependence on the environment. Here weintroduce a novel implementation of grain charging in the cosmologicalradiative transfer code CRASH. We first benchmark the code predictions on aseries of idealized dusty HII regions created by a single star, in order toassess the impact of grain properties on the resulting spatial distribution ofcharges. Second, we perform a realistic radiative transfer simulation of a starforming region extracted from a dusty galaxy evolving in the Epoch ofReionization. We find that $\sim 13$ % of the total dust mass gets negativelycharged, mainly silicate and graphite grains of radius micron. A complexspatial distribution of grain charges is also found, primarily depending on theexposure to stellar radiation and strongly varying along different lines ofsight, as a result of radiative transfer effects. We finally assess the impactof grain properties (both chemical composition and size) on the resultingcharge distribution. The new implementation described here will open up a widerange of possible studies investigating the physical evolution of the dustyISM, nowadays accessible to observations of high and low redshift galaxies.

Radiative transfer of ionizing radiation through gas and dust: grain charging in star forming regions