radial profiles of satellite galaxies: first student-led paper from our group!

Radial profile of satellite dwarf galaxies around MW-mass hosts in the FIRE simulations, as compared with the MW and M31

Excited to announce the first student-led paper from our group, led by Ph.D. student Jenna Samuel: A profile in FIRE: resolving the radial distributions of satellite dwarf galaxies in the Local Group with simulations. Jenna examined the radial distribution of satellite dwarf galaxies around MW/M31-mass hosts in our FIRE simulations, which she showed are consistent with the Local Group. The satellites of MW-like galaxies from the SAGA survey have 2D radial profiles that are similar to our simulations too. Interestingly, more massive host galaxies have fewer satellites at small distances, which is caused by tidal destruction from the central galaxy. Jenna also quantified the destruction of subhalos by comparing our baryonic simulations to their dark matter-only versions, finding 10x destruction within the inner 20 kpc. Finally, Jenna applied approximations of observational completeness in the LG to our simulations, predicting that there may be 2-10 satellites with stellar mass > 10^5 Msun to be discovered around the MW, and 6-9 around M31. Congratulations to Jenna for such a good first paper!