The effect of reionization on the CMB-density correlation

Details The effect of reionization on the CMB-density correlation The effect of reionization on the CMB-density correlation

2007-06-02

arxiv.org/abs/0706.0274v1

Mon.Not.Roy.Astron.Soc.381:819,2007

Astronomy and Astrophysics

Astrophysics

8 pages, 8 figures

Scientific paper

10.1111/j.1365-2966.2007.12282.x

In this paper we show how the rescattering of CMB photons after cosmic reionization can give a significant linear contribution to the temperature-matter cross-correlation measurements. These anisotropies, which arise via a late time Doppler effect, are on scales much larger than the typical scale of non-linear effects at reionization; they can contribute to degree scale cross-correlations and could affect the interpretation of similar correlations resulting from the integrated Sachs-Wolfe effect. While expected to be small at low redshifts, these correlations can be large given a probe of the density at high redshift, and so could be a useful probe of the cosmic reionization history.

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