Kavli Affiliate: Nickolay Y. Gnedin
| First 5 Authors: Nickolay Y. Gnedin, , , ,
| Summary:
The role of unresolved structures ("mini-halos") in determining the
consumption of ionizing photons during cosmic reionization remains an unsolved
problem in modeling cosmic reionization, despite recent extensive studies with
small-box high-resolution simulations by Park et al. and Chan et al., because
the small-box studies are not able to fully sample all environments. In this
paper these simulations are combined with large-box simulations from the
"Cosmic Reionization On Computers" (CROC) project, allowing one to account for
the full range of environments and to produce an estimate for the number of
recombinations per hydrogen atom that are missed in large-scale simulations
like CROC or Thesan. I find that recombinations in unresolved mini-halos are
completely negligible compared to recombinations produced in large-scale cosmic
structures and inside more massive, fully resolved halos. Since both Park et
al. and Chan et al. studies have severe limitations, the conclusions of this
paper may need to be verified with more representative sets of small-box
high-resolution simulations.
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