Superclusters of galaxies from the 2dF redshift survey

II. Comparison with simulations

¹ Tartu Observatory, 61602 Tõravere, Estonia e-mail: einasto@aai.ee
² Estonian University of Life Sciences
³ Tuorla Observatory, Väisäläntie 20, Piikkiö, Finland
⁴ Astrophysical Institute Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany
⁵ Fermi National Accelerator Laboratory, MS 127, PO Box 500, Batavia, IL 60510, USA

Received: 26 April 2006
Accepted: 28 July 2006

Abstract

Aims.We investigate properties of superclusters of galaxies found in of the 2dF Galaxy Redshift Survey, and compare them with properties of superclusters from the Millennium Simulation.

Methods.We study the dependence of various characteristics of superclusters on their distance from the observer, on their total luminosity, and on their multiplicity. The multiplicity is defined by the number of Density Field (DF) clusters in superclusters. Using the multiplicity we divide superclusters into four richness classes: poor, medium, rich and extremely rich.

Results.We show that superclusters are asymmetrical and have a multi-branching filamentary structure, with the degree of asymmetry and filamentarity being higher for the more luminous and richer superclusters. The comparison of real superclusters with Millennium superclusters shows that most properties of simulated superclusters agree very well with real data, the main differences being in the luminosity and multiplicity distributions.