Using Velocity Dispersion to Estimate Halo Mass: Is the Local Group in Tension with $\Lambda$CDM?

Pascal J. Elahi, Chris Power, Claudia del P. Lagos +2

Satellite galaxies are commonly used as tracers to measure the line-of-sight velocity dispersion (${\sigma }_{\mathrm{LOS}}$) of the dark matter halo associated with their central galaxy, and t…