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arXiv:2502.01308 [astro-ph.CO]AbstractReferencesReviewsResources

In search for the Local Universe dynamical homogeneity scale with CF4++ peculiar velocities

Helene M. Courtois, Jeremy Mould, Amber M. Hollinger, Alexandra Dupuy, Chuan-Peng Zhang

Published 2025-02-03Version 1

This article explores a groundbreaking update to the cosmography of the local Universe within z = 0.1, incorporating galaxy peculiar velocity datasets from the first data releases of WALLABY, FAST and DESI surveys. The galaxies with peculiar velocities currently selected in each survey is 655, 4796 and 4191 respectively. The new CF4++ compendium enables a more comprehensive study of the nearby Universe bulk flow dynamics. This analysis reveals that the dynamical scale of homogeneity is not yet reached in the interval [200-300] Mpc/h from the observer. This new data also refines the structure of local superclusters, revealing more spherical shapes and more clearly defined boundaries for key regions such as Great Attractor (Laniakea) and Coma. Very few measurements make a big difference in revealing the hidden Vela supercluster.