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1608+656: A Quadruple-Lens System Found in the CLASS Gravitational Lens Survey

机译:1608 + 656:CLASS引力透镜调查中发现的四透镜系统

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摘要

The first phase of a large gravitational lens survey using the Very Large Array at a wavelength of 3.6 cm has been completed, yielding images for 3258 radio sources. The Cosmic Lens All-Sky Survey (CLASS) is designed to locate gravitational lens systems consisting of multiply imaged compact components with separations greater than 0.”2. We report here the first discovery of a gravitational lens from the survey: 1608+656, a quadruply imaged object with a maximum separation of 2.”1. Images from the Palomar 5 m and Keck 10 m telescopes show the lensed images and the lensing galaxy. An optical spectrum obtained with the Palomar 5 m telescope indicates a redshift of z=0.6304 for the lensing galaxy. No conclusive redshift for the lensed object has been determined, although a single strong emission line is found at 9240 Å in the Keck low-resolution imaging spectrograph spectrum. The two most likely identifications for this line are Hβ (z=0.90) and Mg II (z=2.30). The preliminary lens model derived from the radio image reproduces the observed configuration and relative fluxes of the images, as well as the position, shape, and orientation of the lensing galaxy. Because a simple mass model is able to fit the observations, we argue that this lens system is promising for determining H_0.
机译:使用甚大阵列在3.6厘米波长处进行的大型重力透镜调查的第一阶段已经完成,产生了3258个无线电源的图像。宇宙透镜全天候测量系统(CLASS)旨在定位重力透镜系统,该系统由多重成像的紧凑组件组成,其间距大于0。” 2。我们在此报告从这次调查中首次发现的引力透镜:1608 + 656,这是一个四倍成像对象,最大间隔为2。” 1。来自Palomar 5 m和Keck 10 m望远镜的图像显示了镜头图像和镜头星系。使用Palomar 5 m望远镜获得的光谱表明,对于透镜星系来说,z = 0.6304的红移。尽管在凯克低分辨率成像光谱仪光谱中发现9240Å处有一条很强的发射线,但没有确定透镜物体的结论性红移。这条线的两个最可能的标识是Hβ(z = 0.90)和Mg II(z = 2.30)。从放射线图像得出的初步镜头模型会再现观察到的图像构型和相对通量,以及镜头星系的位置,形状和方向。因为简单的质量模型能够拟合观测值,所以我们认为该透镜系统有望确定H_0。

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