EDP Sciences
Free access
Volume 405, Number 2, July II 2003
Page(s) 425 - 443
Section Extragalactic astronomy
DOI http://dx.doi.org/10.1051/0004-6361:20030419

A&A 405, 425-443 (2003)
DOI: 10.1051/0004-6361:20030419

Clusters and superclusters in the Sloan Digital Sky Survey

J. Einasto1, G. Hütsi1, M. Einasto1, E. Saar1, D. L. Tucker2, V. Müller3, P. Heinämäki1, 4 and S. S. Allam5, 2

1  Tartu Observatory, 61602 Tõravere, Estonia
2  Fermi National Accelerator Laboratory, MS 127, PO Box 500, Batavia, IL 60510, USA
3  Astrophysical Institute Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany
4  Tuorla Observatory, Väisäläntie 20, Piikkiö, Finland
5  National Research Institute for Astronomy & Geophysics, Helwan Observatory, Cairo, Egypt

(Received 9 December 2002 / Accepted 13 March 2003 )

We apply the 2-dimensional high-resolution density field of galaxies of the Early Data Release of the Sloan Digital Sky Survey with a smoothing lengths 0.8  h-1 Mpc to extract clusters and groups of galaxies, and a low-resolution field with smoothing lengths 10  h-1 Mpc 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 luminosity a factor of 5 - 10 higher than in low-density environment. There exists a large anisotropy between the SDSS Northern and Southern sample in the properties of clusters and superclusters: most luminous clusters and superclusters in the Northern sample are a factor of 2 more luminous than the respective systems in the Southern sample.

Key words: cosmology: large-scale structure of the Universe -- clusters of galaxies; cosmology: large-scale structure of the Universe -- galaxies: clusters: general

Offprint request: J. Einasto, einasto@aai.ee

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