Light-cone anisotropy in 21cm fluctuations during the epoch of reionization

Abstract

The delay in light travel time along the line of sight generates an anisotropy in the power spectrum of 21cm brightness fluctuations from the epoch of reionization. We show that when the fluctuations in the neutral hydrogen fraction become non-linear at the later stages of reionization, the light-cone anisotropy becomes of order unity on scales >50 comoving Mpc. During this period the density fluctuations and the associated anisotropy generated by peculiar velocities are negligible in comparison.

arXiv comment5 journal pages, 4 figures, MNRAS Letters, revised version

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• A method to determine the evolution history of the mean neutral Hydrogen fraction
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• Inevitable imprints of patchy reionization on the cosmic microwave background anisotropy
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• Constraining exotic dark matter models with the dark ages 21-cm signal
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