Jenny Sorce (Institut de Physique Nucléaire de Lyon, Leibniz Institut für Astrophysik Potsdam), "Observations give us CLUES to Cosmic Flows' origins"

jeudi 18 sept. 2014, 14:00 → 15:00 Europe/Paris

1213-RC/SB-11 (LPNHE)

Cosmic variance affects the study of our neighborhood. Reproducing the Local Structure with theories to compare with observations is a remedy to that effect. Simulations constrained by observational radial peculiar velocities are excellent tools to replicate the Local Universe. Observational data come from the international Cosmicflows project. Cosmicflows builds catalogs of accurate distance measurements to map deviations from the expansion. These measures are mainly obtained with the galaxy luminosity-rotation rate correlation. We will present the calibration of that relation in the mid-infrared with observational data from Spitzer Space Telescope. The international CLUES project uses the resulting catalogs. We will report improvements and applications of the CLUES' method on the catalogs. For the first time, cosmological simulations are constrained solely by peculiar velocities. The process is successful as resulting simulations resemble the Local Universe. The major attractors and voids form at positions approaching observational locations by a few megaparsecs, thus reaching the limit imposed by the linear theory.