MG14 - Talk detail

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Supercluster of galaxies are objects that are now collapsing, barely out of the linear evolution phase of density fluctuations. The low density contrast between supercluster and the field, just above unity, make their detection burdensome. We present here an investigation of the structure and dynamics of the supercluster SC0028-0005 at redshift 0.22 identified through photometric and spectroscopy data from SDSS-DR10. We have determined the mass of six detected clusters/groups and used them as probes of the internal supercluster dynamics. Using a simple cosmological spherical collapse model, we estimate that the mass within 10 Mpc should lie between 4 and 16 x 10^15 solar masses. The farthest detected members of the supercluster suggest that within 60 Mpc the density contrast is \delta ~ 3 with respect to the critical density at the supercluster redshift. We conclude that most of the supercluster mass is in the form of galaxy group sized or smaller substructures, presently undetected.

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