Las Campanas Redshift Survey and the Supercluster-void network

We study the Las Campanas Redshift Survey in the supercluster-void network as traced by optical (Abell and APM) and X-ray clusters.

In this Figure blue spheres represent loose groups, white spheres represent Abell clusters and violet spheres represent X-ray clusters.

We calculate the mass function of the Las Campanas Loose Groups (P. Heinämäki, J. Einasto, M. Einasto, E. Saar, D. L. Tucker, and V. Müller, 2003, AA 397, 63).

We show the environmental enhancement of the Las Campanas Loose Groups in the neighbourhood of rich clusters of galaxies (M. Einasto, J. Einasto, V. Müller, P. Heinämäki, and D. L. Tucker, AA, accepted, astro-ph/0211590).

We show that Las Campanas Loose Groups in the superclusters of Abell clusters are themselves richer and more massive than groups in systems without Abell clusters. We find that the systems of loose groups show some tendency to be oriented perpendicularly with respect to the line-of-sight. (M. Einasto, J. Jaaniste, J. Einasto, P. Heinämäki, V. Müller, and D. L. Tucker, AA, accepted).

We study the density field of Las Campanas Redshift Survey and show that clusters in high-density environment are about 10 times more luminous than in low-density environment. DF-superclusters that contain Abell clusters are richer and more luminous than DF-superclusters without Abell clusters. (J. Einasto, M. Einasto, G. Hütsi, E. Saar, D. L. Tucker, E. Tago, V. Müller, P. Heinämäki, S. S. Allam AA, submitted).

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