Superclusters of galaxies from the 2dF redshift survey. II. Comparison with simulations

TL;DR

This study compares properties of superclusters from the 2dF Galaxy Redshift Survey with those from Millennium simulations, revealing similarities and differences in their structure and luminosity distributions.

Contribution

It provides a detailed comparison of observed and simulated superclusters, highlighting structural similarities and differences in luminosity and multiplicity distributions.

Findings

Superclusters are asymmetrical with multi-branching filamentary structures.

More luminous and richer superclusters are more asymmetrical and filamentary.

Simulated superclusters closely match real data, except in luminosity and multiplicity distributions.

Abstract

We investigate properties of superclusters of galaxies found on the basis of the 2dF Galaxy Redshift Survey, and compare them with properties of superclusters from the Millennium Simulation. 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. We show that superclusters are asymmetrical and have 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.