The high-redshift neutral hydrogen signature of an anisotropic matter power spectrum

Oscar F. Hernandez, Gilbert P. Holder

Research output: Contribution to journalArticlepeer-review


An anisotropic power spectrum will have a clear signature in the 21 cm radiation from high-redshift hydrogen. We calculate the expected power spectrum of the intensity fluctuations in neutral hydrogen from before the epoch of reionization, and predict the accuracy to which future experiments could constrain a quadrupole anisotropy in the power spectrum. We find that the Square Kilometer Array will have marginal detection abilities for this signal at z ∼ 17 if the process of reionization has not yet started; reionization could enhance the detectability substantially. Pushing to higher redshifts and higher sensitivity will allow highly precise (percent level) measurements of anisotropy.

Original languageEnglish (US)
Article number031
JournalJournal of Cosmology and Astroparticle Physics
Issue number9
StatePublished - Sep 1 2011
Externally publishedYes


  • Power spectrum
  • cosmological parameters from LSS
  • redshift surveys

ASJC Scopus subject areas

  • Astronomy and Astrophysics

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