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Paper: Clusters and Superclusters in the Sloan Survey
Volume: 329, Nearby Large-Scale Structures and the Zone of Avoidance
Page: 27
Authors: Einasto, J.; Tago, E.; Einasto, M.; Saar, E.
Abstract: We find clusters and superclusters of galaxies using the Data Release 1 of the Sloan Digital Sky Survey. We calculate a low-resolution density field with a smoothing length of 10 h−1100 Mpc to extract superclusters of galaxies, and a high-resolution density field with a smoothing length of 0.8 h−1100 Mpc to see the fine structure within superclusters. We found that clusters in a high-density environment have luminosities that are about five times higher than the luminosities of clusters in a low-density environment. Numerical simulations show that in large underdense regions most particles form a rarefied population of pregalactic matter whereas in large overdense regions most particles form a clustered population in rich clusters. Simulations show also that very massive superclusters are great attractors and have small bulk motions. Less massive superclusters are smaller attractors and have much larger bulk motions.

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