Shapes and Probabilities of Galaxy Clusters II: Comparisons with observations

Details Shapes and Probabilities of Galaxy Clusters II: Comparisons with observations Shapes and Probabilities of Galaxy Clusters II: Comparisons with observations

2012-03-16

arxiv.org/abs/1203.3823v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

17 Pages, 7 figures. Submitted to ApJ

Scientific paper

We identify low redshift clusters and groups in the Sloan Digital Sky Survey (SDSS) and estimate their kinetic and correlation potential energies. We compare the distribution of these energies to the predictions by Yang and Saslaw (2012) and in the process estimate a measure of an average 3-dimensional velocity and spatial anisotropy of a sample of clusters. We find that the inferred velocity anisotropy is correlated with the inferred spatial anisotropy. We also find that the general shape of the energy distribution agrees with theory over a wide range of scales from small groups to superclusters once the uncertainties and fluctuations in the estimated energies are included.

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