The end point of the collapse and relaxation of a protogalaxy is a dark matter halo, inside of which the baryonic gas is in hydrostatic equilibrium at a temperature of typically a few million degrees.

• 原星系塌缩与松弛的最终点就是黑暗物质晕，里面有处于流体静力平衡的重子气体，一般温度约数百万度。