Reionization and the Cosmic Microwave Background in an Open Universe
Abstract
If the universe was reionized at high reshift (z greater than or approximately equal to 30) or never recombined, then photonelectron scattering can erase fluctuations in the cosmic microwave background at scales less than or approximately equal to 1 deg. Peculiar motion at the surface of last scattering will then have given rise to new anisotropy at the 1 min level through the Vishniac effect. Here the observed fluctuations in galaxy counts are extrapolated to high redshifts using linear theory, and the expected anisotropy is computed. The predicted level of anisotropies is a function of Omega_{0} and the ratio of the density in ionized baryons to the critical density and is shown to depend strongly on the large and smallscale power. It is not possible to make general statements about the viability of all reionized models based on current observations, but it is possible to rule out specific models for structure formation, particularly those with high baryonic content or smallscale power. The induced fluctuations are shown to scale with cosmological parameters and optical depth.
 Publication:

The Astrophysical Journal
 Pub Date:
 March 1995
 DOI:
 10.1086/175330
 Bibcode:
 1995ApJ...441....1P
 Keywords:

 Astronomical Models;
 Background Radiation;
 Cosmology;
 Galactic Evolution;
 Ionization;
 Microwaves;
 Red Shift;
 Universe;
 Anisotropic Media;
 Baryons;
 PhotonElectron Interaction;
 Quadrupoles;
 Statistical Distributions;
 Astrophysics;
 COSMOLOGY: COSMIC MICROWAVE BACKGROUND;
 COSMOLOGY: THEORY