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arXiv 0810.3971astro-ph
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一个被低红移星系透镜化为6”爱因斯坦环的QSO plus宿主系统

A QSO plus host system lensed into a 6" Einstein ring by a low redshift galaxy

Kajal K Ghosh, D. Narasimha

摘要:

我们报告了一个偶然发现的“爱因斯坦环”的光学波段从斯隆数字巡天(SDSS)的数据和相关的四个图像的背景源。透镜星系看起来是一个附近的矮椭球体,红移为0.0375 $\pm$ 0.002。透镜类星体的红移为0.6842 $\pm$ 0.0014,它的多个图像几乎沿着半径为$\sim$ 6的环围绕透镜分布近360 $^{o}$。“0。单组分透镜模型需要在距透镜中心6”0范围内的星系质量几乎为10 $^{12}$ M $_{\odot}$。根据现有的数据,我们无法确定类星体和星系的确切位置,方向和通量,尽管有证据表明类星体的双重或多重合并图像。我们还探测到了来自该系统的强无线电和X射线辐射。这表明这个环系统可能嵌入在一个星系群或星系团中。这一独特的环,凭借透镜星系的紧密性,提供了一些关键问题的可能性探测,如本质暗淡星系的质光比,大尺度磁场在椭圆星系的存在等。

英文摘要:

We report the serendipitous discovery of an "Einstein Ring" in the optical band from the Sloan Digital Sky Survey (SDSS) data and associated four images of a background source. The lens galaxy appears to be a nearby dwarf spheroid at a redshift of 0.0375$\pm$0.002. The lensed quasar is at a redshift of 0.6842$\pm$0.0014 and its multiple images are distributed almost 360$^{o}$ around the lens nearly along a ring of radius $\sim$6."0. Single component lens models require a mass of the galaxy of almost 10$^{12}$ M$_{\odot}$ within 6".0 from the lens center. With the available data we are unable to determine the exact positions, orientations and fluxes of the quasar and the galaxy, though there appears evidence for a double or multiple merging image of the quasar. We have also detected strong radio and X-ray emissions from this system. It is indicative that this ring system may be embedded in a group or cluster of galaxies. This unique ring, by virtue of the closeness of the lens galaxy, offers possible probe to some of the key issues like mass-to-light ratio of intrinsically faint galaxies, existence of large scale magnetic fields in elliptical galaxies etc.

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