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arXiv 2405.04577astro-ph.COastro-ph.GA
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KALEIDOSCOPE巡天:大质量星系团MACS J1423.8+2404的强引力透镜与弱引力透镜新视角

The KALEIDOSCOPE survey : A new strong and weak gravitational lensing view of the massive galaxy cluster MACS J1423.8+2404

Nency R. Patel, Mathilde Jauzac, Anna Niemiec, David Lagattuta, Guillaume Mahler, Benjamin Beauchesne, Alastair Edge, Harald Ebeling, Marceau Limousin

AI总结:

本研究结合哈勃望远镜成像与KALEIDOSCOPE巡天光谱数据,对大质量冷核星系团MACS J1423开展强弱引力透镜联合分析,测得不同半径处的投影质量,证实其动力学弛豫状态,为后续韦布望远镜相关巡天分析奠定基础。

摘要:

我们对大质量星系团MACS J1423.8+2404(红移z=0.545,以下简称MACS J1423)开展了强引力透镜与弱引力透镜联合分析。该星系团是大质量星系团巡天(MAssive Cluster Survey)在z>0.5区间发现的动力学最弛豫、质量最大的冷核星系团之一。我们结合了哈勃空间望远镜(HST)F606W、F814W和F160W波段的高分辨率成像数据,以及甚大望远镜搭载的多单元光谱探测器(Multi-Unit Spectroscopic Explorer)作为KALEIDOSCOPE巡天组成部分获取的光谱观测数据。\n我们对星系团核心质量分布的强引力透镜分析,受红移范围1.779<z<2.840内的4个多重像系统(共17个独立像)约束。针对星系团外围的弱引力透镜分析限定在HST视场内,基于数密度为57 gal.arcmin⁻²的背景星系星表开展。我们通过强引力透镜模型测得投影质量M(R<200 kpc) = (1.6 ± 0.05) × 10¹⁴ M☉;结合弱引力透镜约束后,测得投影质量M(R<640 kpc) = (6.6 ± 0.6) × 10¹⁴ M☉。我们对星系团质量分布的分析未发现子结构证据,证实了MACS J1423的动力学弛豫状态。本工作为即将开展的詹姆斯·韦布空间望远镜加拿大近红外成像仪与无狭缝光谱仪无偏星系团巡天中MACS J1423的后续分析奠定了基础。

英文摘要:

We present a combined strong and weak gravitational-lensing analysis of the massive galaxy cluster MACS J1423.8+2404 ($z=0.545$, MACS J1423 hereafter), one of the most dynamically relaxed and massive cool-core clusters discovered in the MAssive Cluster Survey at $z>0.5$. We combine high-resolution imaging from the Hubble Space Telescope (HST) in the F606W, F814W, and F160W pass-bands with spectroscopic observations taken as part of the KALEIDOSCOPE survey with the Multi-Unit Spectroscopic Explorer mounted on the Very Large Telescope. Our strong lensing analysis of the mass distribution in the cluster core is constrained by four multiple-image systems (17 individual images) within redshift range $1.779<z<2.840$. Our weak-lensing analysis of the cluster outskirts, confined to the HST field of view, is based on a background galaxy catalogue with a density of 57 gal.arcmin$^{-2}$. We measure a projected mass of M($\textrm{R}<200$ kpc) = (1.6 $\pm$ 0.05) $\times$ 10$^{14}$ M$_{\rm\odot}$ from our strong-lensing model, and a projected mass of M($\textrm{R}<640$ kpc) = (6.6 $\pm$ 0.6) $\times$ 10$^{14}$ M$_{\rm\odot}$ when combining with our the weak-lensing constraints. Our analysis of the cluster mass distribution yields no evidence of substructures, confirming the dynamically relaxed state of MACS J1423. Our work sets the stage for future analysis of MACS J1423 in the upcoming Canadian Near Infrared Imager and Stiltless Spectrograph Unbiased Cluster Survey for the James Webb Space Telescope.

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