论文标题
计算机上的宇宙电离：类星体吸收光谱中长暗间隙的物理起源
Cosmic Reionization on Computers: Physical Origin of Long Dark Gaps in Quasar Absorption Spectra
论文作者
论文摘要
我探索了“暗间隙”的特性 - 类星体吸收光谱中没有明显传播的区域 - 宇宙回离计算机（CROC）项目的几个模拟。最大可用盒子（120 cmpc）中的CROC仿真几乎与平均不透明的分布和黑暗间隙的频率相匹配，但可惜的不是相同的模型：与平均不透性相匹配的运行符合足够的黑暗间隙，反之亦然。电源 - 在该运行中，电离以z = 6.7结束（可能为时过早）。 虽然多个因素有助于模拟中较大的黑暗间隙的频率，但控制深度间隙分布的整体形状的主要因素是空隙中的电离水平 - 最低密度区域会产生终止长间隙的最高传输峰值。结果，暗间隙分布与差距检测阈值上方的频谱的比例密切相关，观察到的分布与该分数为2％的模拟相匹配。因此，差距分布本身并不限制电离的时机。
I explore the properties of "dark gaps" - regions in quasar absorption spectra without significant transmission - with several simulations from the Cosmic Reionization On Computers (CROC) project. CROC simulations in largest available boxes (120 cMpc) come close to matching both the distribution of mean opacities and the frequency of dark gaps, but alas not in the same model: the run that matches the mean opacities fails to contain enough dark gaps and vice versa.:( Never-the-less, the run that matches the dark gap distributions serves as a counter-example to claims in the literature that the dark gap statistics requires a late end to reionization - in that run reionization ends at z=6.7 (likely too early). While multiple factors contribute to the frequency of large dark gaps in the simulations, the primary factor that controls the overall shape of the dark gap distribution is the ionization level in voids - the lowest density regions produce the highest transmission spikes that terminate long gaps. As the result, the dark gap distribution correlates strongly with the fraction of the spectrum above the gap detection threshold, the observed distribution is matched by the simulation in which this fraction is 2%. Hence, the gap distribution by itself does not constrain the timing of reionization.
