Voids in the Las Campanas Redshift Survey versus cold dark matter models

摘要: ABSTRACT We have analyzed the distribution of void sizes in two-dimensional slices ofthe Las Campanas Redshift Survey (LCRS). Fourteen volume-limited subsamples wereextracted from six to cover a large part survey and test robust-ness results against cosmic variance. Thirteen samples were randomly culled toproduce homogeneously selected samples. then studied relationship betweenthe cumulative area covered by voids size as property voidhierarchy. find that scales with mean galaxyseparation, λ. In particular, we covering half isgiven D med ≈ λ+(12±3)h −1 Mpc. Next, employing an environmental densitythreshold criterion identify mock galaxies, able extend this analysis tomock dynamical n-body simulations Cold Dark Matter (CDM) mod-els. To reproduce observed statistics, overdensity thresholds δ th 0...1are necessary. compared standard (SCDM), open (OCDM), vacuum energydominated (ΛCDM), broken scale invariant CDM models (BCDM): thatboth coverage two-point correlation function provide im-portant complementary information on large-scale matter distribution. Thedependence statistics threshold for galaxy inden-tification shows biasing is more crucial distributionthan are differences between cosmological models.Key words: cosmology: dark – galaxies: formation structure universe.