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arXiv 1709.08975astro-ph.GA
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利用PanSTARRS1和盖亚发现z = 3.34的五象透镜类星体

The Discovery of a Five-Image Lensed Quasar at z = 3.34 using PanSTARRS1 and Gaia

Fernanda Ostrovski, Cameron A. Lemon, Matthew W. Auger, Richard G. McMahon, Christopher D. Fassnacht, Geoff C. -F. Chen, Andrew J. Connolly, Sergey E. Koposov, … 展开作者

Fernanda Ostrovski, Cameron A. Lemon, Matthew W. Auger, Richard G. McMahon, Christopher D. Fassnacht, Geoff C. -F. Chen, Andrew J. Connolly, Sergey E. Koposov, Estelle Pons, Sophie L. Reed, Cristian E. Rusu

摘要:

我们报告了引力透镜类星体系统PS J 0630 -1201的发现、光谱学证实和质量模型。该透镜是通过将Pan-STARRS和WISE测光汇编的测光类星体目录与盖亚DR 1目录相匹配而发现的,利用后者的高空间分辨率(FWHM $\sim $ 0.1”)来识别透镜的三个最亮的组成部分。WHT的后续光谱观测证实了多个物体是红移为$z_{q}=3.34$的类星体。Keck AO高分辨率成像的进一步跟踪显示,该系统由两个透镜星系组成,类星体被透镜化为一个$\sim$ 2.8”分离的四像尖形配置,第五个图像清晰可见,以及一个由于透镜类星体宿主星系而形成的1.0”弧。该系统是良好的建模与两个奇异的等温椭球,再现的第五个图像的位置。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。

英文摘要:

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-STARRS and WISE photometry to the Gaia DR1 catalogue, exploiting the high spatial resolution of the latter (FWHM $\sim $0.1") to identify the three brightest components of the lens. Follow-up spectroscopic observations with the WHT confirm the multiple objects are quasars at redshift $z_{q}=3.34$. Further follow-up with Keck AO high-resolution imaging reveals that the system is composed of two lensing galaxies and the quasar is lensed into a $\sim$2.8" separation four-image cusp configuration with a fifth image clearly visible, and a 1.0" 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 detected Einstein arcs associated with the quasar host galaxy.

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