The Reionization Parameter Space Consistent with the Thomson Optical Depth from Planck

The Reionization Parameter Space Consistent with the Thomson Optical Depth from Planck
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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:
Research Notes of the AAS
影响因子:
--
通讯作者:
H. Trac
H. Trac
中科院分区:
--
文献类型:
--
作者:
Dani Glazer;M. Rau;H. Trac

文献摘要

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我们研究的再电离参数空间符合当前测量的汤姆逊光学深度使用一个新的参数化的再电离的历史。质量加权电离分数指定的红移中点,持续时间和不对称形状参数。我们使用保守的平坦先验和物理约束进行MCMC分析。我们的分析产生了红移的中点$z_{50}=7.66\substack{+0.57-0.61}\text{(68%)}\substack{+1.26-1.02}\text{(95%)}$,以及持续时间$\Delta_\text{z} < 7.5$和不对称性$A_\text{z}<5.3$的上限$\tau = 0.054 \pm 0.007$。重建的质量加权电离分数$x_\text{i}(z)$是不对称的,但早期的再电离贡献很小。
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.