ULAS J234311 .93-005034.0：选自UKIDSS和SDSS的重力透镜系统
ULAS J234311.93-005034.0: A gravitational lens system selected from UKIDSS and SDSS
摘要：
我们报告一个新的引力透镜系统的发现。这个天体ULAS J234311.93-005034.0是第一个使用新的UKIRT红外深空巡天（UKIDSS）和斯隆数字巡天（SDSS）选中的天体。ULAS J234311.93-005034.0系统包含一个红移为0.788的类星体，它是双重成像的，间距为1.4”。这两个类星体的图像具有相同的红移和相似的光谱，尽管不是完全相同。这个透镜星系是通过从凯克望远镜拍摄的R波段图像中减去点扩散函数而探测到的。透镜星系也可以通过减去A和B图像的光谱来检测，因为更多的星系光可能存在于后者中。没有从星系中确定红移，尽管它的光谱形状表明红移约为0.3。该天体的透镜状态是安全的，因为两个具有相同红移的天体与一个透镜星系一起被识别出来。我们的成像表明，透镜是在一个集群环境中发现的，其中候选的弧形结构，需要确认，在附近可见。由于UKIDSS的深度及其总体良好的视觉条件，UKIDSS调查中的镜片的进一步发现可能是该计划的一部分。
英文摘要：
We report the discovery of a new gravitational lens system. This object, ULAS J234311.93-005034.0, is the first to be selected by using the new UKIRT Infrared Deep Sky Survey (UKIDSS), together with the Sloan Digital Sky Survey (SDSS). The ULAS J234311.93-005034.0 system contains a quasar at redshift 0.788 which is doubly imaged, with separation 1.4". The two quasar images have the same redshift and similar, though not identical, spectra. The lensing galaxy is detected by subtracting point-spread functions from R-band images taken with the Keck telescope. The lensing galaxy can also be detected by subtracting the spectra of the A and B images, since more of the galaxy light is likely to be present in the latter. No redshift is determined from the galaxy, although the shape of its spectrum suggests a redshift of about 0.3. The object's lens status is secure, due to the identification of two objects with the same redshift together with a lensing galaxy. Our imaging suggests that the lens is found in a cluster environment, in which candidate arc-like structures, that require confirmation, are visible in the vicinity. Further discoveries of lenses from the UKIDSS survey are likely as part of this programme, due to the depth of UKIDSS and its generally good seeing conditions.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
