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Optical+Near-IR Analysis of a Newly Confirmed Einstein Ring at z ∼ 1 from the Kilo-Degree Survey: Dark Matter Fraction, Total and Dark Matter Density Slope, and Initial Mass Function

  • Authors: Rui Li, Nicola R. Napolitano, Giuseppe D'Ago, Vyacheslav N. Shalyapin, Kai Zhu, Xiaotong Guo, Ran Li, Léon V. E. Koopmans, Chiara Spiniello, Crescenzo Tortora, Francesco La Barbera, Haicheng Feng, Liang Gao, Zhiqi Huang, Koen Kuijken, Hui Li, Linghua Xie, Mario Radovich, Alexey Sergeyev

Rui Li et al 2025 The Astrophysical Journal Letters 987 .

  • Provider: AAS Journals

Caption: Figure 1.

Images of KIDS J0233−3447. Top left: color-composite images (﹩{2}^{{\prime} }\times {2}^{{\prime} }﹩) from KiDS observation and the zoom-in of the lens (12″ × 12″). Top right: Y-band image from HAWK-I@VLT (﹩{2}^{{\prime} }\times {2}^{{\prime} }﹩) and the zoom-in of the lens (12″ × 12″). Bottom: eight-band images from KiDS and VIKING. The two slits used for the spectroscopical observations are shown in orange dashed (for lens) and solid (for arcs) rectangles on the Y-band image, respectively. White arrows labeled with arc1 to arc4 show the approximate location of the regions used to extract the spectra of the arcs (see Section 2.1).

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