A Dynamical Model of the Local Group

Understand

This dynamical model for the 28 galaxies with distances less than 1.5 Mpc, and not apparently tight satellites, is constrained by the initial condition that peculiar velocities at high redshift are small and growing in accordance with the standard cosmology.

• The solution is a satisfactory fit to most of the measured redshifts, distances, and proper motions, with some interesting exceptions that call for further investigation.
• The model predicts Milky Way rotation speed 256 km/s, consistent with Reid et al.
• (2009a).