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Astron. Astrophys. 362, 835-839 (2000)


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Spatial structure and periodicity in the Universe

J.A. González, H. Quevedo, M. Salgado and D. Sudarsky

Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, A.P. 70-543, México, D.F. 04510, México (cervera, quevedo, marcelo, sudarsky@nuclecu.unam.mx)

Received 28 March 2000 / Accepted 25 August 2000

Abstract

We analyze the possibility that the spatial periodicity of 128[FORMULA] Mpc in the galaxy count number observed recently in deep pencil-beam surveys could be explained by the mere existence of structure with the appropriate scale in the galaxy distribution in the Universe. We simulate a universe where the distribution of galaxies has an intrinsic length scale and then investigate the probability of observing in a given direction a spatial periodicity similar to that observed in the pencil-beam surveys of the galactic polar regions. A statistical analysis shows that this probability is of the order of [FORMULA], a value which excludes the afore mentioned explanation. This result contrasts with the estimates based on Voronoi foam models which yield probabilities of the order [FORMULA]. The conclusion that emerges from these studies put together with the present one, is that although they can be obtained in some models, the presence of an intrinsic scale in the structure is not sufficient to achieve reasonable probabilities for observation of the detected periodicities.

Key words: cosmology: large-scale structure of Universe – cosmology: distance scale – galaxies: distances and redshifts – galaxies: statistics – methods: statistical

Send offprint requests to: M. Salgado

© European Southern Observatory (ESO) 2000

Online publication: October 30, 2000

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