In search for the Local Universe dynamical homogeneity scale with CF4++ peculiar velocities
arXiv:2502.01308 · doi:10.1051/0004-6361/202553677
Abstract
This article explores an 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. We find a bulk flow of 315 \pm 40 km/s at 150 Mpc/h. This analysis additionally 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.To help colleagues obtain a peculiar velocity prediction for the object they are currently studying (SNIa, gravitational waves, etc.), we publicly release the CF4++ catalogue, as well as the reconstructed density and velocity fields used in this work.
8 pages, 9 figures, 1 table
References in corpus (21)
- The Laniakea supercluster of galaxies
- Cosmological parameters from the comparison of peculiar velocities with predictions from the 2M++ density field
- Cosmicflows-4
- Galaxy And Mass Assembly: Deconstructing Bimodality - I. Red ones and blue ones
- Analyzing the Large-Scale Bulk Flow using CosmicFlows4: Increasing Tension with the Standard Cosmological Model
- The FAST all sky HI survey (FASHI): The first release of catalog
- The DECam Local Volume Exploration Survey Data Release 2
- Cosmic Bulk Flow and the Local Motion from Cosmicflows-2
- 2MTF IV. A bulk flow measurement of the local Universe
- WALLABY Pilot Survey: Public release of HI data for almost 600 galaxies from phase 1 of ASKAP pilot observations
- Evaluating bulk flow estimators for CosmicFlows-4 measurements
- Peculiar-velocity cosmology with Types Ia and II supernovae
- Gravity in the Local Universe : density and velocity fields using CosmicFlows-4
- An environmental dependence of the physical and structural properties in the Hydra Cluster galaxies
- Large-scale motions and growth rate from forward-modelling Tully-Fisher peculiar velocities
- WALLABY Pre-Pilot Survey: HI Content of the Eridanus Supergroup
- Giant disk galaxies : Where environment trumps mass in galaxy evolution
- Bulk Flow Motion Detection in the Local Universe with Pantheon Type Ia Supernovae
- The CAVITY project. The spatially resolved stellar population properties of galaxies in voids
- WALLABY Pre-Pilot and Pilot Survey: the Tully Fisher Relation in Eridanus, Hydra, Norma and NGC4636 fields
- Cosmic Flow Measurement and Mock Sampling Algorithm of Cosmicflows-4 Tully-Fisher Catalogue