Star Stream Velocity Distributions in CDM and WDM Galactic Halos
Star Stream Velocity Distributions in CDM and WDM Galactic Halos
The dark matter subhalos orbiting in a galactic halo perturb the orbits of stars in thin stellar streams. Over time the random velocities in the streams develop non-Gaussian wings. The rate of velocity increase is approximately a random walk at a rate proportional to the number of subhalos, primarily those …