Journal article

Fluctuations in 21-cm emission after reionization

J Stuart B Wyithe, Abraham Loeb

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | OXFORD UNIV PRESS | Published : 2008

Abstract

The fluctuations in the emission of redshifted 21-cm photons from neutral intergalactic hydrogen will provide an unprecedented probe of the reionization era. Conventional wisdom assumes that this 21-cm signal disappears as soon as reionization is complete, when little atomic hydrogen is left through most of the volume of the intergalactic medium (IGM). However, observations of damped Lyα absorbers indicate that the fraction of hydrogen in its neutral form is significant by mass at all redshifts. Here we use a physically motivated model to show that residual neutral gas, confined to dense regions in the IGM with a high recombination rate, will generate a significant post-reionization 21-cm si..

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University of Melbourne Researchers