Separating out the Alcock-Paczynski effect on 21-cm fluctuations

2005/08/31 by Rennan Barkana, R. Barkana · 1 citation
Physics and Astronomy · #Anisotropy #COSMIC cancer database #Cosmic background radiation #Cosmic microwave background #Cosmology #Cosmology and Gravitation Theories #Hubble's law #Ionization #Observational cosmology #Radio Astronomy Observations and Technology #Redshift #Relativity and Gravitational Theory #Spectral density #astro-ph

paper · pdf · doi:10.1111/j.1365-2966.2006.10882.x

published as Mon.Not.Roy.Astron.Soc.372:259-264,2006 · 6 pages, 3 figures, MNRAS, revised version

openalex publication_date 2006/09/13 · arxiv created 2007/04/26 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

We reconsider the Alcock–Paczyński effect on 21-cm fluctuations from high redshift, focusing on the 21-cm power spectrum. We show that at each accessible redshift both the angular diameter distance and the Hubble constant can be determined from the power spectrum, at epochs and on scales where the ionized fraction fluctuations are linear. Furthermore, this is possible using anisotropies that depend only on linear density perturbations and not on astrophysical sources of 21-cm fluctuations. We show that measuring these quantities at high redshift would not just confirm results from the cosmic microwave background (CMB); if the 21-cm power spectrum can be measured to better than 10 per cent precision, it will improve constraints from the CMB alone on cosmological parameters including dark energy.

Citations

• 21 Centimeter Tomography of the Intergalactic Medium at High Redshift
• The Sensitivity of First‐Generation Epoch of Reionization Observatories and Their Potential for Differentiating Theoretical Power Spectra
• Measuring the Small-Scale Power Spectrum of Cosmic Density Fluctuations through 21 cm Tomography Prior to the Epoch of Structure Formation
• Probing the epoch of early baryonic infall through 21-cm fluctuations
• The Growth of HiiRegions During Reionization
• First‐Year Wilkinson Microwave Anisotropy Probe ( WMAP ) Observations: Determination of Cosmological Parameters
• Redshifting rings of power
• Power Spectra for Cold Dark Matter and Its Variants
• The 2dF Galaxy Redshift Survey: power-spectrum analysis of the final data set and cosmological implications
• The cosmic microwave background radiation fluctuations from H i perturbations prior to reionization
• In the Beginning: The First Sources of Light and the Reionization of the Universe
• Galactic winds and the Lyα forest

Cited by

• The rise of the first stars: Supersonic streaming, radiative feedback, and 21-cm cosmology