Dark Matter and Cosmic Web Story by Jaan Einasto

Author:Jaan Einasto [Einasto, Jaan]
Language: eng
Format: epub
Publisher: World Scientific Publishing Company
Published: 2014-01-15T05:00:00+00:00

Fig. 7.2 Left panel: the correlation function of the observed sample O around the Virgo cluster (cube of side 80 Mpc), of the sample generated by the hierarchical clustering model H, and of the adiabatic model A. Right panel: the maximal length LM of connected regions as a function of neighbourhood radius r for four catalogues: O, A, H, and P (Poisson model). All distances are expressed for Hubble constant h = 0.5 (Zeldovich et al., 1982).

As a further test I suggested using the multiplicity function of systems of galaxies/particles, found for various neighbourhood radii r. At each radius r we counted the number of systems of certain multiplicity (number of galaxies/particles). The frequency of systems of various multiplicity for the neighbourhood radius r = 5 Mpc (for Hubble constant h = 0.5) is shown in Fig. 7.3. The multiplicity is expressed in a logarithmic scale, in powers of 2: 0 corresponds to 20 = 1, i.e. isolated galaxies, 5 to 25 = 32, i.e. medium rich systems, etc. Actually a histogram of multiplicities is shown; between indices i and i + 1 all systems with multiplicities between 2i and 2i +1 are counted.

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