中文摘要：

上世纪70年代,在类星体的射电喷流中观测到视超光速运动.本文解释了视超光速现象产生的物理本质,它来源于观测上视觉效应.当喷流与视线方向呈一个合适的夹角,且喷流速度大于0.7c时,可以观测到视超光速现象.我们对著名类星体3C273的蒙特卡洛模拟表明其喷流与视线方向的夹角位于0°-6°这个小范围内.

英文摘要：

1970s, the superluminal motion has been observed in radio jet of some quasars. In this paper, an example was used to account for the physical essence resulted in superluminal motion, which come of seeing illusion during observation. The jet with an appropriate inclination angle between the jet and line of sight, and a speed of 〉 0.7c can observe the superluminal motion. Our results by Monte Carlo simulation show that the inclination angle between the jet and the line of sight of 3C 273 is in the range of 0° -6° .