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

Rennan Barkana, Abraham Loeb

Research output: Contribution to journalLetterpeer-review


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
Issue number1
StatePublished - Oct 2006


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


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