Cluster-Supercluster Alignments

Details Cluster-Supercluster Alignments Cluster-Supercluster Alignments

2006-08-31

arxiv.org/abs/astro-ph/0608685v2

Astrophys.J.657:30-36.2007

Astronomy and Astrophysics

Astrophysics

accepted by ApJ, revised version, new analysis using those superclusters with more than 5 clusters included

Scientific paper

10.1086/511003

We study correlations in spatial orientation between galaxy clusters and their host superclusters using a Hubble Volume N-body realization of a concordance cosmology and an analytic model for tidally-induced alignments. We derive an analytic form for distributions of the alignment angle as functions of halo mass (M), ellipticity (epsilon), distance (r) and velocity (v) and show that the model, after tuning of three parameters, provides a good fit to the numerical results. The parameters indicate a high degree of alignment along anisotropic, collapsed filaments. The degree of alignment increases with M and epsilon while it decreases with r and is independent of v. We note the possibility of using the cluster-supercluster alignment effect as a cosmological probe to constrain the slope of the initial power spectrum.

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