The shape, multiplicity, and evolution of superclusters in ACDM cosmology

James J. Wray, Neta A. Bahcall, Paul Bode, Carl Boettiger, Philip F. Hopkins

Research output: Contribution to journalArticle

19 Scopus citations

Abstract

We determine the shape, multiplicity, size, and radial structure of superclusters in the ACDM 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 h-1 Mpc. The supercluster multiplicity (richness) increases linearly with supercluster size. The density profile in superclusters is approximately isothermal (∼A-2) and steepens on larger scales. These results can be used as a new test of the current cosmology when compared with up-coming observations of large-scale surveys.

Original languageEnglish (US)
Pages (from-to)907-916
Number of pages10
JournalAstrophysical Journal
Volume652
Issue number2 I
DOIs
StatePublished - Dec 1 2006

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Keywords

  • Cosmology: theory
  • Galaxies: clusters: general
  • Large-scale structure of universe

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