出典:Wikipedia
出典:『Wikipedia』 (2011/05/07 08:33 UTC 版)
A multiply imaged quasar is a quasar that is undergoing gravitational microlensing, resulting in double, triple or quadruple images of the same quasar. The first such gravitational lens to be discovered was the double-imaged quasar Q0957+561 in 1979 A grouping of two or more quasars can result from a chance alignment, physical proximity, actual close physical interaction, or effects of gravity bending the light of a single quasar into two or more images.