Varstrometry for Off-nucleus and Dual Subkiloparsec AGN (VODKA). SDSS J1608+2716: A Subarcsecond Quadruply Lensed Quasar at z = 2.575
Varstrometry for Off-nucleus and Dual Subkiloparsec AGN (VODKA). SDSS J1608+2716: A Subarcsecond Quadruply Lensed Quasar at z = 2.575
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DOI：
10.3847/2041-8213/acf27a
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发表时间：
2023-06
期刊：
影响因子：
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通讯作者：
Junyao Li;Xin Liu;Yue Shen;M. Oguri;Arran C. Gross;N. Zakamska;Yu-Ching Chen;H. Hwang
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文献类型：
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作者：
Junyao Li;Xin Liu;Yue Shen;M. Oguri;Arran C. Gross;N. Zakamska;Yu-Ching Chen;H. Hwang
我们报告了哈勃太空望远镜（HST）宽视场相机3深红外（F160W）对SDSS J1608+2716的成像。该系统位于红移z = 2.575处，最近被报道为亚弧秒间隔（~ 0.″25）的三类星体候选者，基于盖亚天体测量和后续凯克自适应光学辅助积分场单位光谱的选择。我们新的HST深红外成像显示了位于~ 0的第四个点状成分的存在。″9远离三重体系。此外，我们还探测到位于四个点源之间的一个边缘盘状星系。在强引力透镜作用下，整个系统呈现出典型的尖点结构，利用基于单一等温椭球质量剖面的透镜模型可以成功再现观测到的图像配置。这些发现表明这个系统是一个四重透镜类星体。我们的研究结果强调了在高红移的~千秒差距尺度上识别双/多类星体所面临的挑战，并强调了深度、高分辨率红外成像在有力确认此类系统中的关键作用。
We report Hubble Space Telescope (HST) Wide Field Camera 3 deep IR (F160W) imaging of SDSS J1608+2716. This system, located at a redshift of z = 2.575, was recently reported as a triple-quasar candidate with subarcsecond separations (∼0.″25) based on selection from Gaia astrometry and follow-up Keck adaptive optics–assisted integral field unit spectroscopy. Our new HST deep IR imaging reveals the presence of a fourth point-like component located ∼0.″9 away from the triple system. Additionally, we detect an edge-on disk galaxy located in between the four point sources. The entire system exhibits a characteristic cusp structure in the context of strong gravitational lensing, and the observed image configuration can be successfully reproduced using a lens model based on a singular isothermal ellipsoid mass profile. These findings indicate that this system is a quadruply lensed quasar. Our results highlight the challenges associated with identifying dual/multiple quasars on ∼kiloparsec scales at high redshifts and emphasize the crucial role of deep, high-resolution IR imaging in robustly confirming such systems.