2011/04/30 by Oscar F. Hernández, Oscar F. Hernandez, G. P. Holder +1 · 1 citation
Physics and Astronomy · #Anisotropy #Astrophysics #Astrophysics and Cosmic Phenomena #Computer science #Galaxy #Gamma-ray bursts and supernovae #Intensity mapping #Optics #Physics #Radio Astronomy Observations and Technology #Redshift #Reionization #Spectral density #Telecommunications #astro-ph.CO
paper · pdf · doi:10.1088/1475-7516/2011/09/031
8 pages, 1 figure, modified in response to referee suggestions
arxiv created 2011/08/02 · openalex publication_date 2011/09/26 · arxiv updated 2015/05/28 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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.