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

Rennan Barkana*, Abraham Loeb

*Corresponding author for this work

Research output: Contribution to journalLetterpeer-review

46 Scopus citations

Abstract

The delay in light traveltime along the line of sight generates an anisotropy in the power spectrum of 21-cm 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 the order of unity on scales ≳50 comoving Mpc. During this period the density fluctuations and the associated anisotropy generated by peculiar velocities are negligible in comparison.

Original languageEnglish
Pages (from-to)L43-L47
JournalMonthly Notices of the Royal Astronomical Society: Letters
Volume372
Issue number1
DOIs
StatePublished - Oct 2006

Funding

FundersFunder number
National Science Foundation2004386

    Keywords

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

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