POSSIBLE GEOMETRIC PATTERNS IN 0.1C SCALE STRUCTURE

The union of Abell and Abell-Corwin-Olowin samples of rich clusters provides a view of the universe up to z approximately 0.1 and within this domain there are two outstanding concentrations of clusters. The nearer of these, the Shapley concentration 140 h-1 Mpc from us, lies close to the direction of our motion inferred from the microwave dipole, suggesting that coherent streaming may extend over this great scale. In addition, there are two startling geometric results: (1) the previously announced concentration of rich clusters to the supergalactic equator extends across a domain of approximately 450 h-1 Mpc, representing a approximately 6-sigma deviation from a Poissonian distribution and a approximately 3-sigma deviation when clustering is allowed for with a simple model. (2) The Broadhurst et al. "periodicities" in galaxy redshifts anticipate where there are concentrations of clusters and the correspondence orthogonal to the line of sight of their probes appears to be maintained on scales up to 400 h-1 Mpc. These surfaces are orthogonal to the entity on the supergalactic equator. However, they constitute only a small perturbation to the overall cluster distribution, consistent with fluctuations in the cosmic microwave background of DELTA-T/T almost-equal-to 10(-5) on angular scales of approximately 1-degrees.