Simulating Damped Lyman-alpha Systems on a Moving Mesh

I will discuss recent work modelling the distribution of cold gas and metals around DLAs, using the moving mesh code Arepo. DLAs are high column density HI absorption systems and probe directly the gas distribution in halos. Using synthetic metal and HI spectra extracted from recent Arepo simulations incorporating metal enrichment and feedback models, I will compare the properties of DLAs to high-redshift observations, focussing on the column density distribution function, the bias of DLAs to the linear matter power spectrum, and the metallicity distribution, showing that these are (mostly) in good agreement with reality.

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