The Local Velocity Anomaly

TL;DR

This paper investigates the velocity discontinuity at 7 Mpc near the Local Sheet, attributing it to a large, empty Local Void causing a significant peculiar velocity, and discusses implications for cosmic structure.

Contribution

It provides evidence linking the Local Velocity Anomaly to a large, empty Local Void, offering insights into local cosmic structure and dynamics.

Findings

Velocity discontinuity at 7 Mpc identified

Local Void must be at least 45 Mpc in diameter

Local Void is very empty, influencing local galaxy motions

Abstract

There is a velocity discontinuity at about 7 Mpc between the galaxies of the Local Sheet that are moving together with low internal velocity dispersion and the adjacent structures. The Local Sheet bounds the Local Void. The Local Sheet is determined to have a peculiar velocity of 260 km/s away from the center of the void. In order for this large velocity to be generated by an absence of gravity, the Local Void must be at least 45 Mpc in diameter and be very empty.