再电离拓扑的测试
Testing the Topology of Reionization
摘要：
宇宙学氢再电离的中心重叠阶段从根本上说是电离区域拓扑结构的变化。在重叠之前，电离气泡孤立地生长。在重叠期间，它们合并成一个不断膨胀的电离介质，充满了不断增加的体积，最终取代了整个星系际介质中的中性气体。重叠，因此可以很好地研究使用拓扑统计，特别是属数的中性电离接口。应用这种测试最有希望的观测工具是（a）莱曼α星系和（b）21厘米层析成像。当莱曼α星系存在于大于1 Mpc的气泡中时，它们将被探测到，因此它们的存在可以用来绘制这样的气泡。在重叠阶段，预计会有这样大的气泡，而且每个气泡都应该包含一些可检测到的明亮的莱曼阿尔法星系。原则上，21厘米的线提供更好的空间分辨率，但所需的灵敏度和前景减法可能是一个问题。即将到来的莱曼阿尔法调查在近红外线，因此可以提供我们第一次看到的拓扑结构的再电离。
英文摘要：
The central overlap phase of cosmological hydrogen reionization is fundamentally a change in the topology of ionized regions. Before overlap, ionized bubbles grew in isolation. During overlap, they merge into a percolating ionized medium, which fills an ever-increasing volume and eventually replaces neutral gas throughout the intergalactic medium. Overlap can therefore be well studied using topological statistics, and in particular the genus number of the neutral-ionized interface. The most promising observational tools for applying such tests are (a) Lyman alpha galaxies, and (b) 21 cm tomography. Lyman alpha galaxies will be detected whenever they inhabit bubbles larger than 1 physical Mpc, and their presence can therefore be used to map such bubbles. Such large bubbles are expected during the overlap phase, and moreover, each one should contain a few detectably bright Lyman alpha galaxies. The 21cm line in principle affords better spatial resolution, but the required sensitivity and foreground subtraction may be an issue. Upcoming Lyman alpha surveys in the near-infrared could thus provide our first look at the topology of reionization.
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