Volume 410, Number 2, November I 2003
|Page(s)||425 - 443|
|Section||Cosmology (including clusters of galaxies)|
|Published online||17 November 2003|
Clusters and superclusters in the Las Campanas redshift survey
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 Dept. of Astronomy, New Mexico State University, Las Cruces, NM 88003-8001, USA
Corresponding author: J. Einasto, firstname.lastname@example.org
Accepted: 17 July 2003
We use a 2-dimensional high-resolution density field of galaxies of the Las Campanas Redshift Survey (LCRS) with a smoothing length 0.8 h-1 Mpc to extract clusters and groups of galaxies, and a low-resolution field with a smoothing length 10 h-1 Mpc to find superclusters of galaxies. We study the properties of these density field (DF) clusters and superclusters, and compare the properties of the DF-clusters and superclusters with those of Abell clusters and superclusters and LCRS groups. We show that among the cluster samples studied the DF-cluster sample best describes the large-scale distribution of matter and the fine structure of superclusters. We calculate the DF-cluster luminosity function and find that clusters in high-density environments are about ten times more luminous than those in low-density environments. We show that the DF-superclusters that contain Abell clusters are richer and more luminous than the DF-superclusters without Abell clusters. The distribution of DF-clusters and superclusters shows the hierarchy of systems in the universe.
Key words: cosmology: observations / cosmology: large-scale structure of the Universe / galaxies: clusters: general
© ESO, 2003
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