Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-03-02
Astrophys.J.652:907-916,2006
Astronomy and Astrophysics
Astrophysics
33 pages, 15 figures, accepted to ApJ; minor content changes, some figures removed to shorten paper
Scientific paper
10.1086/508600
We determine the shape, multiplicity, size, and radial structure of superclusters in the LambdaCDM concordance cosmology from z = 0 to z = 2. Superclusters are defined as clusters of clusters in our large-scale cosmological simulation. We find that superclusters are triaxial in shape; many have flattened since early times to become nearly two-dimensional structures at present, with a small fraction of filamentary systems. The size and multiplicity functions are presented at different redshifts. Supercluster sizes extend to scales of ~ 100 - 200 Mpc/h. The supercluster multiplicity (richness) increases linearly with supercluster size. The density profile in superclusters is approximately isothermal (~ R^{-2}) and steepens on larger scales. These results can be used as a new test of the current cosmology when compared with upcoming observations of large-scale surveys.
Bahcall Neta A.
Bode Paul
Boettiger Carl
Hopkins Philip F.
Wray James J.
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