The discovery of a five-image lensed quasar at z = 3.34 using PanSTARRS1 and Gaia
The discovery of a five-image lensed quasar at z = 3.34 using PanSTARRS1 and Gaia
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使用 PanSTARRS1 和 Gaia 发现 z = 3.34 处的五图像透镜类星体
DOI：
10.1093/mnrasl/slx173
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
Ostrovski F
中科院分区：
文献类型：
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作者：
Ostrovski F
我们报告了引力透镜类星体系统PS J 0630 −1201的发现、光谱学确认和质量模型。透镜的发现是通过将由Pan-STARRS 1和宽视场红外巡天探测器光度学编制的光度学类星体目录与Gaillesrelease 1目录相匹配，利用后者的高空间分辨率（半峰全宽为0.1弧秒）来识别透镜类星体系统的三个最明亮的组成部分。威廉·赫歇尔望远镜的后续光谱观测证实了这多个物体是类星体，其红移为3.34。进一步的凯克自适应光学高分辨率成像显示，该系统由两个透镜星系组成，类星体被透镜化为一个2.8角秒的四像尖点配置，第五个图像清晰可见，以及一个1.0角秒的弧，这是由于透镜类星体宿主星系。该系统是很好的建模与两个奇异的等温椭球，再现第五个图像的位置。我们讨论了未来的前景，测量图像之间的时间延迟和约束质量和光之间的任何偏移，使用微弱检测到的爱因斯坦弧与类星体的宿主星系。
We report the discovery, spectroscopic confirmation and mass modelling of the gravitationally lensed quasar system PS J0630−1201. The lens was discovered by matching a photometric quasar catalogue compiled from Pan-STARRS1 andWide-field Infrared Survey Explorerphotometry to theGaiadata release 1 catalogue, exploiting the high spatial resolution of the latter (full width at half-maximum ∼0.1 arcsec) to identify the three brightest components of the lensed quasar system. Follow-up spectroscopic observations with the William Herschel Telescope confirm the multiple objects are quasars at redshiftzq= 3.34. Further follow-up with Keck adaptive optics high-resolution imaging reveals that the system is composed of two lensing galaxies and the quasar is lensed into an ∼2.8 arcsec separation four-image cusp configuration with a fifth image clearly visible, and a 1.0 arcsec arc due to the lensed quasar host galaxy. The system is well modelled with two singular isothermal ellipsoids, reproducing the position of the fifth image. We discuss future prospects for measuring time delays between the images and constraining any offset between mass and light using the faintly detectedEinsteinarcs associated with the quasar host galaxy.