The three-dimensional gravitational velocity field within z~0.1 has been modeled with the Wiener filter methodology applied to the Cosmicflows-3 compilation of galaxy distances. The dominant features are a basin of attraction and two basins of repulsion. The major basin of attraction is an extension of the Shapley concentration of galaxies. One basin of repulsion, the Dipole Repeller, is located near the anti-apex of the cosmic microwave background dipole. The other basin of repulsion is in the proximate direction toward the 'Cold Spot' irregularity in the cosmic microwave background. It has been speculated that a vast void might contribute to the amplitude of the Cold Spot from the integrated Sachs-Wolfe effect.
@article{arxiv.1708.07547,
title = {Cosmicflows-3: Cold Spot Repeller?},
author = {Helene M. Courtois and R. Brent Tully and Yehuda Hoffman and Daniel Pomarede and Romain Graziani and Alexandra Dupuy},
journal= {arXiv preprint arXiv:1708.07547},
year = {2017}
}
Comments
Accepted for publication in The Astrophysical Journal Letters