可观测的引力双象

恒星作为引力透镜的重要性长期以来被忽视,已有文章指出,几乎所有河外天体都应由于某颗恒星的引力场对光线的偏折之故而形成双象。在大多数情况下,这样的双象的角距在毫角秒的数量级。有理由相信,当天文观测深入到毫角秒以下时,会出现好些奇特现象,特别是河外天体中两个小部分之间的表观速度很容易超过光速。

Observable Gravitational Double-image

The importance of steliar gravitational lens has long been ignored. It was pointed out that almost every extragalactic object should form two images owing to the bending of light by the gravitational field of a certain star. In most cases., the anguler distance of such two images is in the order of millisecond of arc. When astronomical observation is going deep into the realm of millisecond of arc, it is reasonable to believe that, among other strange things, the apparent reJative velocity between two small parts in an extragalactic object is easy to exceed that of light.