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arXiv 0809.1417astro-ph
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加速宇宙中束缚超星系团的未来演化

Future Evolution of Bound Superclusters in an Accelerating Universe

Pablo A. Araya-Melo, Andreas Reisenegger, Andres Meza, Rien van de Weygaert, Rolando Dünner, Hernan Quintana

备注：
27 pages, 17 figures, accepted for publication in MNRAS, revised version after referee report
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摘要：

在一个加速的LambdaCDM宇宙的边缘绑定的超星系团状物体的演变如下，通过宇宙学模拟，从现在的时间膨胀因子a = 100。根据Dunner等人（2006年）提出的结合密度标准识别物体。超星系团被认为是质量M > 10^15 M_sun/h的超星系团，最大质量的超星系团的M约为8 × 10^15 M_sun/h，与沙普利超星系团相当。超星系团的空间分布在本纪元之后基本上保持不变，反映了随着λ开始主导宇宙的膨胀，宇宙网的停止增长。同样的趋势可以在维里化晕和束缚物体的质量函数的发展停滞中看到。情况是相当不同的，当看内部的演变，量化的形状，紧凑性和密度分布，和子结构的多重功能。我们发现一个持续的演变，从一个广泛的三轴形状在a = 1到几乎完美的球形在a = 100。我们还发现了一个系统的趋势，向更高的浓度。与此同时，我们看到它们的子结构逐渐消失，因为周围的子块落入并合并形成一个连贯的，维里化的系统。

英文摘要：

The evolution of marginally bound supercluster-like objects in an accelerating LambdaCDM Universe is followed, by means of cosmological simulations, from the present time to an expansion factor a = 100. The objects are identified on the basis of the binding density criterion introduced by Dunner et al. (2006). superclusters are identified with the ones whose mass M > 10^15 M_sun/h, the most massive one with M ~ 8x10^15 M_sun/h, comparable to the Shapley supercluster. The spatial distribution of the superclusters remains essentially the same after the present epoch, reflecting the halting growth of the Cosmic Web as Lambda gets to dominate the expansion of the Universe. The same trend can be seen in the stagnation of the development of the mass function of virialized haloes and bound objects. The situation is considerably different when looking at the internal evolution, quantified in terms of their shape, compactness and density profile, and substructure in terms of their multiplicity function. We find a continuing evolution from a wide range of triaxial shapes at a = 1 to almost perfect spherical shapes at a = 100. We also find a systematic trend towards a higher concentration. Meanwhile, we see their substructure gradually disappearing, as the surrounding subclumps fall in and merge to form one coherent, virialized system.

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