Gas in simulations of high-redshift galaxies and minihaloes

Smadar Naoz*, Rennan Barkana, Andrei Mesinger

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


We study the gas content of haloes in the early universe using high-resolution hydrodynamical simulations. We extract from the simulations and also predict, based on linear theory, the halo mass for which the enclosed baryon fraction equals half of the mean cosmic fraction. We find a rough agreement between the simulations and the predictions, which suggests that during the high-redshift era before stellar heating, the minimum mass needed for a minihalo to keep most of its baryons throughout its formation was ∼3 × 104 M. We also carry out a detailed resolution analysis and show that in order to determine a halo's gas fraction even to 20 per cent accuracy, the halo must be resolved into at least 500 dark matter particles.

Original languageEnglish
Pages (from-to)369-376
Number of pages8
JournalMonthly Notices of the Royal Astronomical Society
Issue number1
StatePublished - Oct 2009


  • Cosmology: theory
  • Galaxies: formation
  • Galaxies: high-redshift


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