The Reionization Parameter Space Consistent with the Thomson Optical Depth from Planck
The Reionization Parameter Space Consistent with the Thomson Optical Depth from Planck
复制标题
与普朗克汤姆逊光深一致的再电离参数空间
DOI:
10.3847/2515-5172/aad68a
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发表时间:
2018
期刊:
影响因子:
--
通讯作者:
H. Trac
中科院分区:
文献类型:
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作者:
Dani Glazer;M. Rau;H. Trac
We study the reionization parameter space consistent with the current measurement of the Thomson optical depth using a new parametrization of the reionization history. The mass-weighted ionization fraction is specified in terms of the redshift midpoint, duration, and asymmetry shape parameters. We perform an MCMC analysis using conservative flat priors and physical constraints. Our analysis yields a redshift midpoint of $z_{50}=7.66\substack{+0.57-0.61}\text{(68%)}\substack{+1.26-1.02}\text{(95%)}$, and upper limits on the duration $\Delta_\text{z} < 7.5$ and asymmetry $A_\text{z}<5.3$ for $\tau = 0.054 \pm 0.007$. The reconstructed mass-weighted ionization fraction $x_\text{i}(z)$ is asymmetric, but early contributions to reionization are minor.