Clusters and Superclusters in the Sloan Survey

J. Einasto, E. Tago, M. Einasto, E. Saar

Proceedings of the workshop "Nearby Large-Scale Structures and the Zone of Avoidance", Cape Town, 28 March - 02 April 2004 [astro-ph/0408463]

We find clusters and superclusters of galaxies using the Data Release 1 of the Sloan Digital Sky Survey. Density fields with smoothing lengthst of 10 and 0.8 Mpc/h are calculated. We found that galaxies and clusters in a high-density environment have luminosities that are five to ten times higher than in a low- density environment. Numerical simulations show that in underdense regions most particles form a rarefied population of pregalactic matter whereas in 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.

Here we show the high and low resolution density field for the SDSS North, DR1:

high resolution: clusters

low resolution: superclusters

clusters and superclusters together: shows the structure of superclusters.

 

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