The apparent superluminal motions observed in some compact radio sources are an important astrophysical phenomenon. Recent VLBI (Very Long Baseline Interfer- ometer) observations have found that a new knot C4 which wa...
Ⅰ. INTRODUCTION So far, no one thinks that the superluminal expansion of extragalactic object is a real motion with the super-light-speed, though eight objects with superluminal expansion have been observed. Many sug...
I. INTRODUCTION The phenomenon of superluminal expansion remains a puzzle for more than ten years.The maximum separated velocity is about 45 times the speed of Light. Various models have been put forward to explain th...