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SLICE:通过强引力透镜质量建模揭示SPT-CLJ1150-2805的多成分并合核心

SLICE: Unveiling the Multi-Component Merging Core of SPT-CLJ1150-2805 Through Strong-Lensing Mass Modelling

James R. Betts, Benjamin Beauchesne, Mathilde Jauzac, David Lagattuta, Guillaume Mahler, Jean-Paul Kneib, Gavin Leroy, Marceau Limousin, Priyamvada Natarajan, Sameeksha Saini, Keren Sharon, Stephane V. Werner, Catherine Cerny, Isaque Dutra, Dominique Eckert, Alaina Einsig, Michael D. Gladders, Gourav Khullarm, Manon Regamey

arXiv 2609.31944首次发表:更新:

发表机构

Durham University; Univ Toulouse, CNES, CNRS, IRAP; University of KwaZulu-Natal(杜伦大学; 图卢兹大学,法国国家空间研究中心,法国国家科学研究中心,研究天体物理学研究所; 夸祖鲁-纳塔尔大学)

机构由 AI 辅助整理,请以论文原文为准。

AI 中文总结

本研究通过JWST等数据构建SPT-CLJ1150-2805的强透镜质量模型,解析出五暗物质晕并合结构,其透镜能力超越哈勃前沿场,成为高红移研究的理想宇宙望远镜。

AI 中文摘要

我们提出了并合星系团SPT-CLJ1150-2805($z=0.383$)的新的强引力透镜和X射线质量模型,结合JWST NIRCam、HST、Chandra和VLT/MUSE数据,稳健地分解其无碰撞和碰撞成分。利用JWST,我们将多像目录扩展了66个新像(其中30个构成6个新系统)。我们的基线模型使用来自20个系统的118个光谱确认像,实现了像平面均方根偏移$0.56''$。一个扩展模型纳入来自8个额外系统的31个额外测光像,产生几乎相同的质量分布,证实了出色的模型稳定性。我们解析了一个复杂的多轴并合后系统,需要五个星系团尺度的暗物质晕,包括一个双峰核心,其不同的晕与每个最亮星系团星系重合。其余质量成分独立地由291个星系团成员的动力学支持($\sigma_v=1960^{+84}_{-92}$ km s$^{-1}$),这些动力学揭示了两个新的星系子结构——其中最北端的我们初步识别为第五个暗物质晕的重子对应体。该星系团是一个极其高效的透镜,具有有效爱因斯坦半径$\theta_E=42.41^{+0.05}_{-0.04}{''}$,对于$z_s=2$的源,包围质量$M(<\theta_E)=3.35^{+0.04}_{-0.03}\times10^{14}M_\odot$。对于$z_s=9$的高红移源,它产生放大截面$A(>10)\simeq0.15$ arcmin$^2$和$A(>30)\simeq0.020$ arcmin$^2$。这种全局透镜能力超过了所有哈勃前沿场星系团。在质量模型之间的系统不确定性主导高红移放大误差的情况下,我们重建的稳定性使该透镜与众不同。这种极端透镜能力与稳健质量模型的结合,确立了SPT-CLJ1150-2805作为高红移研究的首要宇宙望远镜的地位。

英文摘要

We present a new strong-lensing and X-ray mass model of the merging galaxy cluster SPT-CLJ1150-2805 ($z=0.383$), combining JWST NIRCam, HST, Chandra, and VLT/MUSE data to robustly decompose its collisionless and collisional components. Exploiting JWST, we expand the multiple-image catalogue with 66 new images (30 comprising 6 new systems). Our baseline model uses 118 spectroscopically confirmed images from 20 systems, achieving an image-plane root-mean-square offset of $0.56''$. An expanded model incorporating 31 additional photometric images from 8 additional systems yields a near-identical mass distribution, confirming excellent model stability. We resolve a complex multi-axis post-merger system requiring five cluster-scale dark matter haloes, including a bimodal core with distinct haloes coincident with each brightest cluster galaxy. The remaining mass components are independently supported by kinematics of 291 cluster members ($σ_v=1960^{+84}_{-92}$ km s$^{-1}$), which reveal two new galaxy substructures - the northernmost of which we tentatively identify as the baryonic counterpart to our fifth dark matter halo. The cluster is an extraordinarily efficient lens, possessing an effective Einstein radius $θ_E=42.41^{+0.05}_{-0.04}{''}$ and an enclosed mass $M(<θ_E)=3.35^{+0.04}_{-0.03}\times10^{14}M_\odot$ for a source at $z_s=2$. For a high-redshift source at $z_s=9$, it produces a magnification cross-section of $A(>10)\simeq0.15$ arcmin$^2$ and $A(>30)\simeq0.020$ arcmin$^2$. This global lensing power surpasses all Hubble Frontier Fields clusters. In a regime where systematic uncertainties between mass models dominate high-redshift magnification errors, the stability of our reconstruction sets this lens apart. This combination of extreme lensing power and a robust mass model establishes SPT-CLJ1150-2805 as a premier cosmic telescope for high-redshift studies.

Comments30 pages, 14 figures, 8 tables (including appendices). Submitted to MNRAS

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