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2008

Reionization constraints from five-year WMAP data

Mortonson, Michael J., Hu, Wayne

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We study the constraints on reionization from five years of WMAP data, parametrizing the evolution of the average fraction of ionized hydrogen with principal components that provide a complete basis for describing the effects of reionization on large-scale E-mode polarization.

Using Markov Chain Monte Carlo methods, we find that the resulting model-independent estimate of the total optical depth is nearly twice as well determined as the estimate from 3-year WMAP data, in agreement with simpler analyses that assume instantaneous reionization.
The mean value of the optical depth from principal components is slightly larger than the instantaneous value; we find tau=0.097+/-0.017 using only large-scale polarization, and tau=0.101+/-0.019 when temperature data is included.
Likewise, scale invariant n_s=1 spectra are no longer strongly disfavored by WMAP alone.

Reionization constraints from five-year WMAP data · Around

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Barkana, R. & Loeb, A. 2001, Phys. Rep., 349, 125
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Holder, G. P., Haiman, Z., Kaplinghat, M., & Knox, L. 2003, ApJ, 595, 13
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Hu, W. & Holder, G. P. 2003, Phys. Rev. D, 68, 023001
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Kaplinghat, M., Chu, M., Haiman, Z., Holder, G. P., Knox, L., & Skordis, C. 2003, ApJ, 583, 24
2003
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