The effect of reionization on the cosmic microwave background–density correlation

T. Giannantonio, Robert Crittenden

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In this paper, we show how the rescattering of cosmic microwave background 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.
Original languageEnglish
Pages (from-to)819-826
Number of pages8
JournalMonthly Notices of the Royal Astronomical Society
Issue number2
Publication statusPublished - 2007


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