Impact of Inhomogeneous Reionization on Cosmic Microwave Background Anisotropy

  title={Impact of Inhomogeneous Reionization on Cosmic Microwave Background Anisotropy},
  author={Lloyd Knox and Rom'an Scoccimarro and Scott Dodelson},
  journal={Physical Review Letters},
It is likely that the reionization of the Universe did not occur homogeneously. Using a model that associates ionized patches with overdense regions, we find that the resulting cosmic microwave background (CMB) anisotropy power spectrum peaks at angular scales corresponding to the extent of the ionized regions, and has a width that reflects the correlations between them. There is considerable uncertainty in the amplitude. Neglecting inhomogeneous reionization in the determination of… 

Figures and Tables from this paper

Small-Scale Cosmic Microwave Background Temperature and Polarization Anisotropies Due to Patchy Reionization

We study contributions from inhomogeneous (patchy) reionization to arcminute-scale (1000 < l < 10,000) cosmic microwave background (CMB) anisotropies. We show that inhomogeneities in the ionization

Patchy Screening of the Cosmic Microwave Background by Inhomogeneous Reionization

We derive a constraint on patchy screening of the cosmic microwave background from inhomogeneous reionization using off-diagonal TB and TT correlations in WMAP-7 temperature/polarization data. We

Inevitable imprints of patchy reionization on the cosmic microwave background anisotropy

Reionization of the cosmic neutral hydrogen by the first stars in the Universe is an inhomogeneous process which produces spatial fluctuations in free electron density. These fluctuations lead to

Cosmic microwave background anisotropies resulting from feedback-regulated inhomogeneous reionization

We calculate the secondary anisotropies in the cosmic microwave background (CMB) produced by inhomogeneous reionization from simulations in which the effects of radiative and stellar feedback effects

Small-Scale Anisotropy of the Cosmic Background Radiation and Scattering by Cloudy Plasma

If the first stars formed soon after decoupling of baryons from the thermal cosmic background radiation (CBR), the radiation may have been last scattered in a cloudy plasma. We discuss the resulting

The Maximum B-Mode Polarization of the Cosmic Microwave Background from Inhomogeneous Reionization

We compute the B-mode polarization power spectrum of the cosmic microwave background from an epoch of inhomogeneous reionization, using a simple model in which H II regions are represented by ionized

Secondary anisotropies of the CMB

The Cosmic Microwave Background fluctuations provide a powerful probe of the dark ages of the universe through the imprint of the secondary anisotropies associated with the reionization of the

Imprint of Reionization on the Cosmic Microwave Background Bispectrum

We study contributions to the cosmic microwave background (CMB) bispectrum from non-Gaussianity induced by secondary anisotropies during reionization. Large-scale structure in the reionized epoch


The epoch of reionization is a milestone of cosmological structure formation, marking the birth of the first objects massive enough to yield large numbers of ionizing photons. However, the mechanism

The Optical Depth to Reionization as a Probe of Cosmological and Astrophysical Parameters

Current data of high-redshift absorption-line systems imply that hydrogen reionization occurred before redshifts of about 5. Previous works on reionization by the first stars or quasars have shown



Large-scale structure in the Universe

A variety of observations constrain models of the origin of large-scale cosmic structures. Enough observational data have accumulated to constrain (and perhaps determine) the power spectrum of


  • J. 284, L9
  • 1984