Other
Scientific paper
Jul 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002pobeo..73..247s&link_type=abstract
Publications of the Astronomical Observatory of Belgrade (ISSN 0373-3742), No. 73, p. 247 - 255 (2002). In: Proceedings of the T
Other
Clusters Of Galaxies, Spatial Distribution
Scientific paper
In a study of the large voids in the spatial distribution of Abell/ACO clusters of galaxies in the Northern Galactic Hemisphere we have analysed the variations with redshift of the number density of clusters in a large solid angle (galactic latitude b ≥ +30°) and to a limiting redshift z ~ 0.2, as well as the spatial distribution of large voids to z ≤ 0.14. Two samples of clusters (1) with measured redshifts and (2) with measured or photometrically estimated redshifts have been used. While the first sample shows two maxima in the number density distribution at z ~ 0.03 and z ~ 0.07-0.08, known from previous studies, the second one shows also a well defined third maximum at z = 0.12-0.14 which coincides roughly with the third of the peaks in the number of galaxies towards the North Galactic Pole discovered by Broadhurst et al. (1990). The analysis of the spatial void distribution suggests the presence at z ~ 0.07-0.08 of a giant 2-D structure, composed of several known superclusters. We propose an explanation of the third density maximum at z = 0.12-0.14 as a combined effect of (1) the systematic overestimate of m10 - the magnitude of the tenth brightest cluster member - in Abell's catalogue which has affected our estimated redshifts, and (2) the presence in the redshift range 0.12-0.14 of another giant 2-D structure. The existence of the two large-scale structures is in agreement with a quasi-periodic distribution of the rich clusters of galaxies with a period Δz ~ 0.05.
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