Gravitational clustering and the origin of the correlation function of clusters of galaxies
Gravitational clustering and the origin of the correlation function of clusters of galaxies
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DOI：
10.1086/165253
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发表时间：
1987-06
期刊：
影响因子：
--
通讯作者：
A. Kashlinsky
中科院分区：
文献类型：
--
作者：
A. Kashlinsky
研究了引力聚类作用下两点相关函数xi在不同尺度上的演化。结果表明，对于给定的原始密度起伏谱，如果起伏在比当前时代聚类层次的典型旋转尺度（星系群的尺度）更大的尺度上旋转，则xi将增加；这种增加取决于群集的质量（规模）和密度波动谱的幂斜率。这表明，星系团具有较大的(r)相关强度，因为它们是在大质量尺度上旋转的物体。这样就可以很自然地解释簇的xi与其丰富度（质量）和平均分离的相关性。16引用。
The evolution of the two-point correlation function xi on different scales due to gravitational clustering is studied. It is shown that for a given spectrum of primordial density fluctuations xi would be increased for those fluctuations that turned around on scales that are bigger than the typical turnaround scale of clustering hierarchy at the present epoch (scale of groups of galaxies); the increase depends on the mass (scale) of cluster and the power-slope of the spectrum of density fluctuations. It is suggested that clusters of galaxies have large (r) correlation strength because they are the objects that turned around on a large mass scale. The correlation of xi of clusters with their richness (mass) and mean separation are then explained naturally. 16 references.