Multi-scale morphology of the galaxy distribution

Details Multi-scale morphology of the galaxy distribution Multi-scale morphology of the galaxy distribution

2006-10-31

arxiv.org/abs/astro-ph/0610958v1

Mon.Not.Roy.Astron.Soc.374:1030-1044,2007

Astronomy and Astrophysics

Astrophysics

17 pages, 19 figures, accepted for publication in MNRAS

Scientific paper

10.1111/j.1365-2966.2006.11237.x

Many statistical methods have been proposed in the last years for analyzing the spatial distribution of galaxies. Very few of them, however, can handle properly the border effects of complex observational sample volumes. In this paper, we first show how to calculate the Minkowski Functionals (MF) taking into account these border effects. Then we present a multiscale extension of the MF which gives us more information about how the galaxies are spatially distributed. A range of examples using Gaussian random fields illustrate the results. Finally we have applied the Multiscale Minkowski Functionals (MMF) to the 2dF Galaxy Redshift Survey data. The MMF clearly indicates an evolution of morphology with scale. We also compare the 2dF real catalog with mock catalogs and found that Lambda-CDM simulations roughly fit the data, except at the finest scale.

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