Unveiling the largest structures in the nearby Universe: Discovery of the Quipu superstructure

Open Access

Table 2.

Overdensties and volume filling factors of the superstructures in simulations and observations.

Region	18.75 Mpc	28.875 Mpc	38.5 Mpc
Superstructures
Matter overdensity ^(a)	1.3	0.47	0.23
Galaxy overdensity ^(b)	3.6	1.8	1.2
Cluster overdensity ^(c)	8.5	3.3	1.6
Cluster overdensity ^(a)	5.9	1.6	0.6
Volume fraction ^(c)	4.7%	10.8%	17.6%
Volume fraction ^(a)	5.2%	13.5%	22%

Clusters outside

Matter overdensity ^(a)	1.2	0.33	0.11
Galaxy overdensity ^(b)	1.7	0.7	0.3

Notes. Overdensities are defined as Δ = (ρ − ⟨ρ⟩)/ρ.

^(a)

Determined in the Millenium simulations.

^(b)

determined with the 2MASS sample.

^(c)

For CLASSIX galaxy clusters.

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