Dark Matter Substructure and Dwarf Galactic Satellites

Figure 2

Comparison of two 𝑧=0 halos of masses 3×10¹⁴𝑀_⊙ and 3×10¹²𝑀_⊙ formed in flat ΛCDM cosmology (Ω_m=1−Ω_Λ=0.3, ℎ=0.7, 𝜎₈=0.9). In each case the mass distribution around the center of the halo is shown to approximately two virial radii from the center of each halo. Both objects were resolved with similar number of particles and similar spatial resolution relative to the virial radius of the halo in their respective simulations. I leave it as an exercise to the reader to guess the mass of the halo shown in each panel.

(a)

(b)