A Morphological Indicator for Comparing Simulated Cosmological Scenarios with Observations

Details A Morphological Indicator for Comparing Simulated Cosmological Scenarios with Observations A Morphological Indicator for Comparing Simulated Cosmological Scenarios with Observations

1995-10-31

arxiv.org/abs/astro-ph/9510156v1

Astronomy and Astrophysics

Astrophysics

uuencoded compressed postscript file, accepted for publication in Astronomy and Astrophysics

Scientific paper

We propose a morphological multi-scale analysis of large-scale structures obtained by computer simulations and by observations. Structures are obtained at different scales by applying a wavelet transform on the observed and simulated data. Application of a segmentation algorithm allows a quantitative morphological description of the structures at each scale. The morphological parameter which we propose represents the deviation of a structure from sphericity. The dependence on scale of this simple parameter is shown to characterize in simulations the underlying cosmological model. We compare the HDM, CDM and mixed models with the CfA catalogue. This comparison favours a mixed model containing $65\%$ of CDM, $30\%$ of HDM, and $5\%$ baryonic matter.

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