  The relativistic equilibrium velocity distribution coincides with the
Maxwellian distribution for small velocities and vanishes at c, the velocity of
light. Based on the decay pattern of high-energy tail in the relativistic
equilibrium velocity distribution, it is predicted for velocity and velocity
rate distributions of astrophysical plasma particles that they fall off to
zero, as velocity goes to c, slower than any exponential decay but faster than
any power-law decay.
