Effective Screening due to Minihalos During the Epoch of Reionization

Details Effective Screening due to Minihalos During the Epoch of Reionization Effective Screening due to Minihalos During the Epoch of Reionization

2002-04-08

arxiv.org/abs/astro-ph/0204139v1

Astrophys.J. 578 (2002) 1-11

Astronomy and Astrophysics

Astrophysics

24 pages, 5 figures, submitted to ApJ

Scientific paper

10.1086/342313

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 around unity in redshift between the time of the overlap of ionized bubbles in the intergalactic medium and the lifting of complete Gunn-Peterson Lyman alpha absorption. The minihalos responsible for this screening effect are not resolved by existing numerical simulations of reionization.

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