An Efficient Search for Gravitationally Lensed Radio Lobes
An Efficient Search for Gravitationally Lensed Radio Lobes
复制标题
有效搜索引力透镜射电波瓣
DOI：
--
复制
发表时间：
2000
期刊：
影响因子：
--
通讯作者：
T. Muxlow
中科院分区：
文献类型：
--
作者：
J. Lehár;A. Buchalter;R. McMahon;C. Kochanek;T. Muxlow
我们进行了第一次射电测量与自动平板测量(APM)光学目录的自动比较，以寻找与光学对应的射电叶。基于对约3000°2的初步调查，我们选择了33个候选镜片样本进行VLA确认。对这些候选者的VLA和光学观测产生了两个透镜系统，一个是新发现的(J0816+5003)，另一个是先前已知的(J1549+3047)。另外两个候选星系有射电波瓣，星系重叠，但缺乏多次成像的证据。我们的目标之一(J0958+2947)是一对投影的近距离类星体(红移2.064和2.744处的8‘间隔)。我们的搜索方法效率很高，超过5%的观察目标被透镜，而通常的成功率不到1%。使用整个第一次测量，我们预计使用这种方法可以在短时间内找到5到10个透镜，而使用更深层次的光学测量和计划中的VLA升级，样本可能会增加到北部天空中的数百个透镜瓣。这样的样本将是星系结构和演化的强大探测器。
We performed an automated comparison of the FIRST radio survey with the Automatic Plate Measuring (APM) optical catalog to find radio lobes with optical counterparts. Based on an initial survey covering ~3000 deg2, we selected a sample of 33 lens candidates for VLA confirmation. VLA and optical observations of these candidates yielded two lens systems, one a new discovery (J0816+5003) and one that was previously known (J1549+3047). Two other candidates have radio lobes with galaxies superposed but lack evidence of multiple imaging. One of our targets (J0958+2947) is a projected close pair of quasars (8' separation at redshifts 2.064 and 2.744). Our search method is highly efficient, with greater than 5% of our observing targets being lensed, compared to the usual success rate of less than 1%. Using the whole FIRST survey, we expect to find five to 10 lenses in short order using this approach, and the sample could increase to hundreds of lensed lobes in the northern sky, using deeper optical surveys and planned upgrades to the VLA. Such a sample would be a powerful probe of galaxy structure and evolution.