漂移集形式中的高红移空洞
High-redshift voids in the excursion set formalism
摘要：
空洞是低红移星系分布的主要特征。最近的几次调查也发现了在高红移处存在大尺度结构的证据。我们提出了分析估计星系空洞的大小在红移z ~ 5 - 10使用的偏移集形式主义。我们发现，最近在z ~ 5 - 6.5的窄带调查应该找到空洞的特征尺度约为20百万秒差距，最大直径接近40百万秒差距。这与现有的调查是一致的，但由于迄今为止调查的数量相对较小，很难进行精确的比较。在z ~ 7 - 10处，假设质量大于10^10 M_sun的暗物质晕中的所有星系都是可观测的，我们预计特征空洞尺度为~ 14 - 20 Mpc。我们发现，这些特征尺度是类似的空区域的大小，从纯粹的随机波动的星系计数。因此，真正的大尺度结构将很难在z ~ 7 - 10观测到，除非质量小于~ 10^9 M_sun的晕星系是可见的。星系调查必须深入，只有最大的空洞才能提供有意义的信息。我们的模型提供了一个方便的图片估计宇宙方差的“最坏情况”的影响高红移星系调查有限的体积。
英文摘要：
Voids are a dominant feature of the low-redshift galaxy distribution. Several recent surveys have found evidence for the existence of large-scale structure at high redshifts as well. We present analytic estimates of galaxy void sizes at redshifts z ~ 5 - 10 using the excursion set formalism. We find that recent narrow-band surveys at z ~ 5 - 6.5 should find voids with characteristic scales of roughly 20 comoving Mpc and maximum diameters approaching 40 Mpc. This is consistent with existing surveys, but a precise comparison is difficult because of the relatively small volumes probed so far. At z ~ 7 - 10, we expect characteristic void scales of ~ 14 - 20 comoving Mpc assuming that all galaxies within dark matter haloes more massive than 10^10 M_sun are observable. We find that these characteristic scales are similar to the sizes of empty regions resulting from purely random fluctuations in the galaxy counts. As a result, true large-scale structure will be difficult to observe at z ~ 7 - 10, unless galaxies in haloes with masses less than ~ 10^9 M_sun are visible. Galaxy surveys must be deep and only the largest voids will provide meaningful information. Our model provides a convenient picture for estimating the "worst-case" effects of cosmic variance on high-redshift galaxy surveys with limited volumes.
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