Cosmic metal density evolution in neutral gas: insights from observations and cosmological simulations

  title={Cosmic metal density evolution in neutral gas: insights from observations and cosmological simulations},
  author={Robert M Yates and C{\'e}line P{\'e}roux and Dylan Nelson},
  journal={Monthly Notices of the Royal Astronomical Society},
We contrast the latest observations of the cosmic metal density in neutral gas ($\rho _{\rm {met,neu}}$) with three cosmological galaxy evolution simulations: L-Galaxies 2020, TNG100, and EAGLE. We find that the fraction of total metals that are in neutral gas is <40 per cent at 3 ≲ z ≲ 5 in these simulations, whereas observations of damped Lyman-α (DLA) systems suggest ≳ 85 per cent. In all three simulations, hot, low-density gas is also a major contributor to the cosmic metal budget, even… 

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