Sommaire:

Cosmography is the science that maps and measure the large-scale structures in the observed Universe that are built from the tug of war between gravitation and space expansion. We use the direct galaxy distances to compute the 3-dimensional peculiar/gravitational velocity field in order to reconstruct the underlying distribution of mass responsible of these motions. Filaments, walls and voids are embedded into a more global view of large gravitational watersheds delineated by empty regions. The main advantage of mapping superclusters as watershed basins is the robustness of the definition, allowing them to be used as cosmological probes. The seminar will be a journey relating the telescope campaigns, the discovery of our home supercluster « Laniakea » and the 5 newly cartographied neighbors. We will expose measurements of parameters linked to the cosmology principle of homogeneity and the gravitation law, and inform about the upcoming large surveys.

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