Evolution of the system when the BH is released from rest at a radius of r = 1.5kpc (from top left to bottom right). The black arrow indicates the velocity vector. Large density fluctuations soon develop in the inner ∼1kpc where the BH potential becomes dominant. After t ≈ 100 Myr of evolution, strong density fluctuations appear, including large-scale voids (deep blue). The BH used in the calculation had a mass M_• = 1.25 × 10⁷ M_⊙.