Dust in the first galaxies

Abstract

Using cosmological volume simulations and a custom built sub-grid model for Pop~III star formation, we examine the baseline dust extinction in the first galaxies due to Pop~III metal enrichment in the first billion years of cosmic history. We find that while the most enriched, high-density lines of sight in primordial galaxies can experience a measurable amount of extinction from Pop~III dust ($E(B-V{)}_{\max }=0.07,A_{\mathrm{V},\max }\approx 0.28$), the average extinction is very low with $⟨E(B-V)⟩\lesssim 10^{-3}$. We derive a power-law relationship between dark matter halo mass and extinction of $E(B-V)\propto M_{\mathrm{halo}}^{0.80}$. Performing a Monte Carlo parameter study, we establish the baseline reddening of the UV spectra of dwarf galaxies at high redshift due to Pop~III enrichment only. With this method, we find $⟨{\beta }_{\mathrm{UV}}⟩-2.51\pm 0.07$, which is both nearly halo mass and redshift independent.

Published 01/2018 pages, 5 figures

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