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2.3. Number Density of Clusters
The number density of clusters is a strong function of cluster
richness. Integrated cluster densities, nc (>
NR), representing the number
density of clusters above a given richness threshold, and
the associated mean cluster separation, d
(
nc-1/3),
are listed in Table 3
(Bahcall and Cen 1993).
R | NR | nc (> NR)h3 (Mpc-3) a | d (> NR) h-1 (Mpc) |
![]() | ![]() | 13.5 × 10-6 | 42 |
![]() | ![]() | 6.0 × 10-6 | 55 |
![]() | ![]() | 1.2 × 10-6 | 94 |
![]() | ![]() | 1.5 × 10-7 | 188 |
a Approximate uncertainties are 10±
0.2 for the R
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