The Signature of Patchy Reionization in the Polarization Anisotropy of the CMB

Details The Signature of Patchy Reionization in the Polarization Anisotropy of the CMB The Signature of Patchy Reionization in the Polarization Anisotropy of the CMB

2007-01-29

arxiv.org/abs/astro-ph/0701784v1

Phys.Rev.D76:043002,2007

Astronomy and Astrophysics

Astrophysics

11 pages, 6 figures, submitted to PRD

Scientific paper

10.1103/PhysRevD.76.043002

The inhomogeneous ionization state of the universe when the first sources of ionizing radiation appeared should lead to anisotropies in the polarization of the cosmic microwave background. We use cosmological simulations of the process by which the first sources ionized the intergalactic medium to study the induced polarization anisotropies. We find that the polarization anisotropies have rms of order ~0.01 \mu K, and local peak values of ~0.1 \mu K, smaller than those due to gravitational lensing on small scales. The polarization direction is highly coherent over degree scales. This directional coherence is not expected from either primary anisotropy or gravitational lensing effects, making the largest signals due to inhomogeneous ionization relatively easy to isolate, should experiments achieve the necessary very low noise levels.

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