In search for the Local Universe dynamical homogeneity scale with CF4++ peculiar velocities
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866914039367467008 |
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| author | Courtois, Helene M. Mould, Jeremy Hollinger, Amber M. Dupuy, Alexandra Zhang, Chuan-Peng |
| author_facet | Courtois, Helene M. Mould, Jeremy Hollinger, Amber M. Dupuy, Alexandra Zhang, Chuan-Peng |
| contents | 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. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2502_01308 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | In search for the Local Universe dynamical homogeneity scale with CF4++ peculiar velocities Courtois, Helene M. Mould, Jeremy Hollinger, Amber M. Dupuy, Alexandra Zhang, Chuan-Peng Cosmology and Nongalactic Astrophysics 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. |
| title | In search for the Local Universe dynamical homogeneity scale with CF4++ peculiar velocities |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2502.01308 |