Characteristics of the spatial distribution of rich clusters of galaxies in the northern and southern galactic hemispheres

Astronomy and Astrophysics – Astronomy

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Galactic Clusters, Red Shift, Star Distribution, Stellar Spectra, Astronomical Models, Correlation, Space Observations (From Earth)

Scientific paper

The 3D 2-point correlation function xi(R) for a sample of 70 Abell clusters in the richness class 2 or greater and redshifts of z between 0.06 and 0.24 in the southern galactic hemisphere (southern semi-cone) is calculated. Redshifts for 30 clusters from the sample were measured directly; for other clusters, the Leir-van den Bergh estimates were used. The validity of the method used was tested on a previously used sample from the northern cone region. The correlation function has a peak of xi = 0.6 at R = 250(50/H) Mpc, as in the case of the Northern cone sample. The peak disappears when a larger sample including less rich Abell clusters of the same region is used. A list of 23 new values of z for Abell clusters in the southern galactic hemisphere, measured with a 6-m telescope, is also presented.

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