Large Scale Structures in the Las Campanas Redshift Survey and in Simulations

Details Large Scale Structures in the Las Campanas Redshift Survey and in Simulations Large Scale Structures in the Las Campanas Redshift Survey and in Simulations

1998-11-23

arxiv.org/abs/astro-ph/9811365v1

Astronomy and Astrophysics

Astrophysics

12 LATEX pages, 4 encapsulated figures, to appear in the Proceedings of 'Observational Cosmology: The Development of Galaxy Sy

Scientific paper

The large supercluster structures obvious in recent galaxy redshift surveys are quantified using an one-dimensional cluster analysis (core sampling) and a three-dimensional cluster analysis based on the minimal spanning tree. The comparison with the LCRS reveals promising stable results. At a mean overdensity of about ten, the supercluster systems form huge wall-like structures comprising about 40% of all galaxies. The overdense clusters have a low mean transverse velocity dispersion of about 400 km/s, i.e. they look quite narrow in redshift space. We performed N-body simulations with large box sizes for six cosmological scenarios. The quantitative analysis shows that the observed structures can be understood best in low density models with $\Omega_m \le 0.5$ with or without a cosmological constant.

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