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