宇宙在z=10.6时最多只有88%是中性的
The Universe is at Most 88% Neutral at z=10.6
AI总结：
基于JWST对GN-z11的Lyα发射线观测，通过非均匀再电离模拟限制z=10.6处中性氢分数上限为0.88，并支持暗弱星系逃逸分数更高的再电离模型。
摘要：
最近用JWST对GN-z11的观测揭示了一条等效宽度为18±2埃的Lyα发射线。在z=10.6处，该星系预计位于再电离的核心区域。我们使用一系列非均匀再电离模拟，推导出Lyα等效宽度在穿过具有不同平均中性气体分数x_HI的中性星系间介质后的分布。我们利用这些分布在95%置信水平下，对z=10.6处的x_HI设置了上限，即x_HI < 0.88。我们将此上限与不同的再电离历史模型进行比较，这些模型包括最近发现的在z>8处光度函数亮端的增强。我们发现，暗弱星系相比明亮星系具有更高逃逸分数的模型更受新数据的青睐。
英文摘要：
Recent observations of GN-z11 with JWST have revealed a Ly$α$ emission line with an equivalent width of 18$\pm 2$ angstroms. At z=10.6, this galaxy is expected to lie in the heart of reionization. We use a series of inhomogeneous reionization simulations to derive the distribution of the Ly$α$ EW after traveling through the neutral intergalactic medium with varying average neutral gas fraction, $x_{HI}$. We use these distribution to place an upper limit of $x_{HI} < $ 0.88 at z=10.6 at 95% confidence level. We compare our upper limit to different reionization history models, which include the recently identified enhancement at the bright end of the luminosity function at z>8. We find that models in which faint galaxies have higher escape fraction compared to bright galaxies are favored by the new data.
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