Extended Data Figure 6: The anisotropy of stellar orbits in core galaxies.
From: A 17-billion-solar-mass black hole in a group galaxy with a diffuse core
In NGC 1600 (red line) and similar galaxies with cores12,18 (grey lines), the stellar velocity distribution is anisotropic. The anisotropy parameter, 
, is positive when most of the stars move along radially stretched orbits, and negative when the stellar orbits are predominantly tangential. Inside the diffuse, low-surface-brightness core region (r ≤ rb), tangential motions dominate. The shaded area indicates the range of anisotropies found in numerical N-body simulations of the core scouring mechanism58,64.
