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Issue A&A
Volume 393, Number 1, October I 2002
Page(s) 1 - 23
Section Cosmology
DOI http://dx.doi.org/10.1051/0004-6361:20020811



A&A 393, 1-23 (2002)
DOI: 10.1051/0004-6361:20020811

The supercluster-void network V.

The regularity periodogram
E. Saar1, J. Einasto1, O. Toomet1, A. A. Starobinsky2, 3, H. Andernach4, M. Einasto1, E. Kasak1 and E. Tago1

1  Tartu Observatory, 61602 Tõravere, Estonia
2  Research Center for the Early Universe, University of Tokyo, Tokyo 113-0033, Japan
3  Landau Institute for Theoretical Physics, Moscow 117 334, Russia
4  Depto. de Astronomía, Univ. Guanajuato, Apdo. Postal 144, C.P. 36000, Guanajuato, Mexico

(Received 27 July 1999 / Accepted 28 May 2002 )

Abstract
We analyze the distribution of Abell clusters of galaxies to study the regularity of the supercluster-void network. We apply a new method, the regularity periodogram, that is sensitive to the geometry of the location of clusters, and measure the regularity of the network. We find that the supercluster-void network resembles a cubic lattice over the entire volume considered (out to the distance of 350  h-1 Mpc). The distribution of clusters in rich superclusters is not isotropic: it is periodic along a cubic lattice approximately aligned with the supergalactic coordinates SGX,SGY,SGZ. This large-scale inhomogeneity does not contradict recent CMB data, but its theoretical explanation remains a challenge.


Key words: cosmology: observations -- cosmology: large-scale structure of the Universe

Offprint request: J. Einasto, einasto@aai.ee

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