IAU00538
Presentation type requested: ORAL
MAPS AND CHARACTERISTICS OF NEARBY LARGE-SCALE STRUCTURES
Anthony P Fairall
University of Cape Town
Known low-redshift galaxies offer the closest approximations to volume-limited samples (e.g. to M(B)<-18 for cz<3000 km/s).Their three-dimensional distribution enables us to identify various wall-like and ribbon-like superclusters, and bubble-like voids (for instance as conveyed in the author's 'Atlas of Nearby Large-Scale Structures'). Percolations in redshift space with r=200 km/s take in 99.4% of galaxies (with cz<2000 km/s), showing that virtually every galaxy has a neighbour. Yet those percolations occupy only ~15% of redshift space. They also identify several local isolated high-density regions. However, if the percolation is increased to ~500 km/s, these regions merge to form a single labyrinth of high density, with zero genus (whereby all low-density regions are similarly connected).
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