摘要: Acceleration by radiation pressure could, in principle, explain the observed relativistic velocity of jets extragalactic radio sources. The radiative aceleration mechanism is based on beams that are produced and collimated funnels (vortices) along rotation axis a thick accretion disk. These accelerate particles to form jets. In order ..gamma..>1.5, must be short very steep. However, such cannot satisfy Rayleigh's stability criterion. Therefore, acceleration high velocities.