Clusters and Superclusters in the Sloan Digital Sky Survey

J. Einasto, G. Hütsi, M. Einasto, E. Saar, D. L. Tucker, V. Müller, P. Heinämäki, S. S. Allam

Astronomy and Astrophysics, accepted (astro-ph/0212312)

We apply the 2-dimensional high-resolution density field of galaxies of the Early Data Release of the Sloan Digital Sky Survey to extract clusters and groups of galaxies, and a low-resolution field to extract superclusters of galaxies. We investigate properties of density field clusters and superclusters and compare properties of these clusters and superclusters with Abell clusters, and superclusters found on the basis of Abell clusters. We found that clusters in high-density environment have a higher luminosity than clusters in low-density environment. There exist a large anisotropy of properties of clusters and superclusters between the SDSS Northern and Southern sample, most luminous clusters and superclusters in the Northern sample are a factor of 2 more luminous than respective systems in the Southern sample.

Here we show the high resolution density field of SDSS slices:

North

South

Next we show the distribution of SDSS clusters in respect to the supercluster-void network . Here color spheres represent Abell clusters in very rich superclusters, and white spheres represent SDSS clusters.

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Here you can see the luminosity function for DF-clusters in different environments (in regions of different mean density, numbers show the lower limit of density).

 

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