Voids in the distribution of galaxies - an assessment of their significance and derivation of a void spectrum

Astronomy and Astrophysics – Astronomy

Scientific paper

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Astronomical Spectroscopy, Galactic Clusters, Spatial Distribution, Astronomical Catalogs, Monte Carlo Method, Southern Sky, Voids

Scientific paper

An algorithm has been developed to search for nearly spherical regions which are devoid of bright galaxies. The presence of empty regions, or voids, is an intrinsic property of any spatial point data set. Some means must thus be found of distinguishing between voids which are simply the results of underdensities in the observational data, and voids which have been produced by some physical mechanism. The significance of various voids has been assessed by means of Monte Carlo simulations, using random catalogs which mimic the selection effects of the actual data set. The resultant list of more than 100 voids throughout the entire sky is then used to derive a spectrum of void sizes.

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