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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 2.

Top: optical arm of the spectra of the deflector (in rest frame), obtained from X-Shooter. The 4000 ﹩\dot{{\rm{A}}}﹩ break can be seen. The velocity dispersion can be inferred from the two characteristic absorption lines, e.g., [K] and [H] bands, of elliptical galaxies. Bottom: the spectra of the lensed source in the NUV, VIS, and NIR arms. The four arcs are decomposed from the two slits of different orientations (see Figure 1). The blue line shows the average flux of the four arcs. The Lyα, O II, and O III lines demonstrate that the background source is a Lyα emitter at zs = 2.823.

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