关于超星系团的定义
On the definition of superclusters
摘要：
为了获得超星系团的物理动机定义，我们在以前的工作中提出了选择超星系团的过密度标准，该标准只选择那些将在未来坍缩的对象，包括那些在当前时代转向的对象。在本文中，我们提出了一系列标准宇宙学模型的这些标准的数值。我们表达这些标准的密度比，或者，作为一个下落速度，并表明，这两个标准给出几乎相同的结果。为了更好地说明这一定义的含义，我们将我们的标准应用于局部宇宙，局部超星系团，Shapley超星系团和最近报道的Laniakea超星系团中的一些突出结构，以了解它们未来的演化。我们发现，对于Local和Shapley超星系团，只有中心区域会在未来坍缩，而Laniakea并不构成一个显着的过密度，并会在未来分散。最后，我们建议将那些在未来宇宙加速膨胀和坍缩中幸存下来的超星系团称为“superstes-clusters”，其中“superstes”在拉丁语中的意思是幸存者，以区别于传统的超星系团。
英文摘要：
To obtain a physically well-motivated definition of superclusters, we proposed in our previous work to select superclusters with an overdensity criterion that selects only those objects that will collapse in the future, including those that are at a turn-around in the present epoch. In this paper we present numerical values for these criteria for a range of standard cosmological models. We express these criteria in terms of a density ratio or, alternatively, as an infall velocity and show that these two criteria give almost identical results. To better illustrate the implications of this definition, we applied our criteria to some prominent structures in the local Universe, the Local supercluster, Shapley supercluster, and the recently reported Laniakea supercluster to understand their future evolution. We find that for the Local and Shapley superclusters, only the central regions will collapse in the future, while Laniakea does not constitute a significant overdensity and will disperse in the future. Finally, we suggest that those superclusters that will survive the accelerating cosmic expansion and collapse in the future be called "superstes-clusters", where "superstes" means survivor in Latin, to distinguish them from traditional superclusters.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
