标题： 寻找所有引力透镜类星体的简单方法 显示英文标题

标题： A Simple Method To Find All Lensed Quasars

摘要： 我们演示了利用图像减除方法可以很容易地识别出作为时空延展的时间变化源的引力透镜化类星体。 对于银纬 |b|>20° 的区域，透镜化类星体主导着延展型变源的族群，尽管存在一些来自变星对、变星-类星体对和双类星体的污染，但这些可以通过巡天中的其他信息（如目标光变曲线和颜色）轻易控制。 这将使得计划中的大规模巡天能够几乎探测到透镜化类星体的极限灵敏度，而无需进行大量的后续观测。 显示英文摘要

摘要： We demonstrate that gravitationally lensed quasars are easily recognized using image subtraction methods as time variable sources that are spatially extended. For Galactic latitudes |b|>20 deg, lensed quasars dominate the population of spatially extended variable sources, although there is some contamination from variable star pairs, variable star-quasar pairs and binary quasars that can be easily controlled using other information in the survey such as the object light curves and colors. This will allow planned large-scale synoptic surveys to find lensed quasars almost down to their detection limits without the need for extensive follow-up observations.