Optical plus 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
文献类型：期刊论文
| 作者 | Li, Rui20; Napolitano, Nicola R.17,18,19; D’Ago, Giuseppe16; Shalyapin, Vyacheslav N.14,15; Zhu, Kai13; Guo, Xiaotong12; Li, Ran10,11; Koopmans, Léon V. E.9; Spiniello, Chiara7,8; Tortora, Crescenzo7 |
| 刊名 | ASTROPHYSICAL JOURNAL LETTERS
 |
| 出版日期 | 2025-07-10 |
| 卷号 | 987期号:2 |
| ISSN号 | 2041-8205 |
| DOI | 10.3847/2041-8213/ade680 |
| 产权排序 | 第15完成单位 |
| 文献子类 | Article |
| 英文摘要 | We report the spectroscopic confirmation of a bright blue Einstein ring in the Kilo-Degree Survey (KiDS) footprint: the Einstein blue eye. Spectroscopic data from X-Shooter at the Very Large Telescope (VLT) show that the lens is a typical early-type galaxy (ETG) at zl = 0.9906, while the background source is a Ly alpha emitter at zs = 2.823. The reference lens modeling was performed on a high-resolution Y-band adaptive-optics image from HAWK-I at VLT. Assuming a singular isothermal ellipsoid total mass density profile, we inferred an Einstein radius REin = 10.47 +/- 0.06 kpc. The average slope of the total mass density inside the Einstein radius, as determined by a joint analysis of lensing and isotropic Jeans equations, is gamma tot=2.14-0.07+0.06 , showing no systematic deviation from the slopes of lower-redshift galaxies. This can be the evidence of ETGs developing through dry mergers plus moderate dissipationless accretion. Stellar population analysis with eight-band (griZYJHKs) photometries from KiDS and VIKING shows that the total stellar mass of the lens is M* = (3.95 +/- 0.35) x 1011 M circle dot (Salpeter initial mass function (IMF)), implying a dark matter fraction inside the effective radius of fDM = 0.307 +/- 0.151. We finally explored the dark matter halo slope and found a strong degeneracy with the dynamic stellar mass. Dark matter adiabatic contraction is needed to explain the posterior distribution of the slope, unless an IMF heavier than Salpeter is assumed. |
| 学科主题 | 天文学 ; 星系与宇宙学 |
| URL标识 | 查看原文 |
| 出版地 | TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND |
| WOS关键词 | EARLY-TYPE GALAXIES ; LENS ACS SURVEY ; STELLAR VELOCITY DISPERSION ; BULGE-HALO CONSPIRACY ; ELLIPTIC GALAXIES ; MANGA DYNPOP ; COSMOLOGICAL SIMULATIONS ; INTERNAL STRUCTURE ; DYNAMICAL MODELS ; DRY MERGERS |
| 资助项目 | MOST divided by National Natural Science Foundation of China (NSFC)https://doi.org/10.13039/501100001809[12203096]; National Natural Science Foundation of China[CMS-CSST-2025-A03]; China Manned Space Program[242300420235]; Natural Science Foundation of Henan Province of China[12150710511]; Research Fund for International Scholars of the National Science Foundation of China[2022YFF0503403]; National Key R&D Program of China[2020SKA0110100]; Ministry of Science and Technology of China[YSBR-062]; CAS Project for Young Scientists in Basic Research[2022 LEMON]; INAF research grant[202301AT070339]; INAF research grant[ST/T003081/1]; INAF research grant[ST/X001857/1]; Yunnan Fundamental Research Projects |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001523647800001 |
| 出版者 | IOP Publishing Ltd |
| 资助机构 | MOST divided by National Natural Science Foundation of China (NSFC)https://doi.org/10.13039/501100001809[12203096] ; National Natural Science Foundation of China[CMS-CSST-2025-A03] ; China Manned Space Program[242300420235] ; Natural Science Foundation of Henan Province of China[12150710511] ; Research Fund for International Scholars of the National Science Foundation of China[2022YFF0503403] ; National Key R&D Program of China[2020SKA0110100] ; Ministry of Science and Technology of China[YSBR-062] ; CAS Project for Young Scientists in Basic Research[2022 LEMON] ; INAF research grant[202301AT070339, ST/T003081/1, ST/X001857/1] ; Yunnan Fundamental Research Projects |
| 版本 | 出版稿 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/28407]  |
| 专题 | 云南天文台_丽江天文观测站（南方基地） |
| 通讯作者 | Li, Rui |
| 作者单位 | 1.Institute of Radio Astronomy of National Academy of Science of Ukraine, Mystetstv 4, Ukraine 2.V. N. Karazin Kharkiv National University, Kharkiv, 61022, Ukraine; 3.Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Laboratoire Lagrange, France; 4.INAF—Osservatorio Astronomico di Padova, via dell’Osservatorio 5, 35122 Padova, Italy; 5.Leiden Observatory, Leiden University, P.O.Box 9513, 2300RA Leiden, The Netherlands; 6.Yunnan Observatories, Chinese Academy of Sciences, Kunming, 650011, Yunnan, People’s Republic of China; 7.INAF—Osservatorio Astronomico di Capodimonte, Salita Moiariello 16, 80131—Napoli, Italy; 8.Department of Physics, University of Oxford, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH, UK; 9.Kapteyn Astronomical Institute, University of Groningen, P.O.Box 800, 9700AV Groningen, The Netherlands; 10.School of Astronomy and Space Science, University of Chinese Academy of Science, Beijing 100049, People’s Republic of China; |
| 推荐引用方式 GB/T 7714 | Li, Rui,Napolitano, Nicola R.,D’Ago, Giuseppe,et al. Optical plus 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[J]. ASTROPHYSICAL JOURNAL LETTERS,2025,987(2). |
| APA | Li, Rui.,Napolitano, Nicola R..,D’Ago, Giuseppe.,Shalyapin, Vyacheslav N..,Zhu, Kai.,...&Sergeyev, Alexey.(2025).Optical plus 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.ASTROPHYSICAL JOURNAL LETTERS,987(2). |
| MLA | Li, Rui,et al."Optical plus 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".ASTROPHYSICAL JOURNAL LETTERS 987.2(2025). |
入库方式： OAI收割
来源：云南天文台
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。