New constraints on the dark matter density profiles of dwarf galaxies from proper motions of globular cluster streams

Understand

The central density profiles in dwarf galaxy halos depend strongly on the nature of dark matter.

• Recently, in Malhan et al.
• (2021), we employed N-body simulations to show that the cuspy cold dark matter (CDM) subhalos predicted by cosmological simulations can be differentiated from cored subhalos using the properties of accreted globular cluster (GC) streams since these GCs experience tidal stripping within their parent halos prior to accretion onto the Milky Way.
• We previously found that clusters that are accreted within cuspy subhalos produce streams with larger physical widths and higher dispersions in line-of-sight velocity and angular momentum than streams that are accreted within cored subhalos.