The Distribution of Satellite Galaxies in the TNG100 Simulation

Understand

We investigate the spatial distribution of the satellites of isolated host galaxies in the TNG100 simulation.

• In agreement with a previous, similar analysis of the Illustris-1 simulation, the satellites are typically poor tracers of the mean host mass density.
• Unlike the Illustris-1 satellites, here the spatial distribution of the complete satellite sample is well-fitted by an NFW profile; however, the concentration is a factor of ~2 lower than that of the mean host mass density.
• The spatial distribution of the brightest 50% and faintest 50% of the satellites are also well-fitted by NFW profiles, but the concentrations differ by a factor of ~2.