Effective screening due to minihalos during the epoch of reionization

Rennan Barkana, Abraham Loeb

Research output: Contribution to journalArticlepeer-review


We show that the gaseous halos of collapsed objects introduce a substantial cumulative opacity to ionizing radiation, even after the smoothly distributed hydrogen in the intergalactic medium has been fully reionized. This opacity causes a delay of Δ ≳ 1 in redshift between the time of the overlap of ionized bubbles in the intergalactic medium and the lifting of complete Gunn-Peterson Lyα absorption. The minihalos responsible for this screening effect are not resolved by existing numerical simulations of reionization.

Original languageEnglish
Pages (from-to)1-11
Number of pages11
JournalAstrophysical Journal
Issue number1 I
StatePublished - 10 Oct 2002


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


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