Secondary CMB Anisotropies from Cosmological Reionization

Details Secondary CMB Anisotropies from Cosmological Reionization Secondary CMB Anisotropies from Cosmological Reionization

2000-08-30

arxiv.org/abs/astro-ph/0008469v3

Astronomy and Astrophysics

Astrophysics

accepted by ApJ

Scientific paper

10.1086/320076

We use numerical simulation of cosmological reionization to calculate the secondary CMB anisotropies in a representative flat low density cosmological model. We show that the kinetic Sunyaev-Zel'dovich effect (scattering off of moving electrons in the ionized intergalactic medium) is dominated by the nonlinear hydrodynamic and gravitational evolution of the density and velocity fields, rather than the detailed distribution of the ionization fraction (``patchy reionization'') on all angular scales. Combining our results with the recent calculation of secondary CMB anisotropies by Springel et al., we are able to accurately predict the power spectrum of the kinetic SZ effect on almost all angular scales.

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