Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-04-26
Astron.Astrophys.462:397,2007
Astronomy and Astrophysics
Astrophysics
15 pages, 13 Figures, submitted for Astronomy and Astrophysics
Scientific paper
10.1051/0004-6361:20065501
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.
Einasto Jaan
Einasto Maret
H"utsi Gert
Hein"am"aki P.
Jaaniste Jaak
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