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RELICS:大质量星系团MACS J0308 .9+2645和PLCK G171 .9-40.7的强透镜分析

RELICS: Strong-lensing analysis of the massive clusters MACS J0308.9+2645 and PLCK G171.9-40.7

Ana Acebron, Nathália Cibirka, Adi Zitrin, Dan Coe, Irene Agulli, Keren Sharon, Maruša Bradač, Brenda Frye, Rachael C. Livermore, Guillaume Mahler, Brett Salmon… 展开作者

Ana Acebron, Nathália Cibirka, Adi Zitrin, Dan Coe, Irene Agulli, Keren Sharon, Maruša Bradač, Brenda Frye, Rachael C. Livermore, Guillaume Mahler, Brett Salmon, Keiichi Umetsu, Larry Bradley, Felipe Andrade-Santos, Roberto Avila, Daniela Carrasco, Catherine Cerny, Nicole G. Czakon, William A. Dawson, Austin T. Hoag, Kuang-Han Huang, Traci L. Johnson, Christine Jones, Shotaro Kikuchihara, Daniel Lam, Lorenzo Lovisari, Ramesh Mainali, Pascal A. Oesch, Sara Ogaz, Masami Ouchi, Matthew Past, Rachel Paterno-Mahler, Avery Peterson, Russell E. Ryan, Irene Sendra-Server, Daniel P. Stark, Victoria Strait, Sune Toft, Michele Trenti, Benedetta Vulcani

摘要:

星系团的强引力透镜效应已经成为探测高红移宇宙的有力工具,可以放大遥远而微弱的背景星系。可靠的强透镜(SL)模型对于确定远距离放大源的内在性质和构建其光度函数至关重要。本文介绍了在再电离透镜星系团巡天(ReinionationLensingClusterSurvey,MACS J0308.9+2645和PLCKG171.9 -40.7)框架内利用哈勃空间望远镜拍摄的两个大质量星系团的首次SL分析。我们使用光迹质量建模技术来揭示多个成像星系的集合,并约束星系团的质量分布。我们的SL分析显示,这两个星系团都有特别大的爱因斯坦半径($θ_E>30"$表示$z_s=2$的源红移),提供了相当大的高放大率区域,对高红移星系的搜索很有用($\sim2$ arcmin $^{2}$与$μ>5$到$\sim1$ arcmin $^{2}$与$μ>10$,类似于典型的\textit{Hubble Frontier Fields}星系团)。我们还发现MACS J0308.9+2645在$z\sim6.4$处有一个有希望的、明显明亮的(J $\sim23.2-24.6$ AB)、多次成像的高红移候选者。这些图像是在ARMICS中发现的最明亮的高红移候选者之一。我们的质量模型,包括放大图,通过米库尔斯基太空望远镜档案馆向社会公开。

英文摘要:

Strong gravitational lensing by galaxy clusters has become a powerful tool for probing the high-redshift Universe, magnifying distant and faint background galaxies. Reliable strong lensing (SL) models are crucial for determining the intrinsic properties of distant, magnified sources and for constructing their luminosity function. We present here the first SL analysis of MACS J0308.9+2645 and PLCK G171.9-40.7, two massive galaxy clusters imaged with the Hubble Space Telescope in the framework of the Reionization Lensing Cluster Survey (RELICS). We use the Light-Traces-Mass modeling technique to uncover sets of multiply imaged galaxies and constrain the mass distribution of the clusters. Our SL analysis reveals that both clusters have particularly large Einstein radii ($θ_E>30"$ for a source redshift of $z_s=2$), providing fairly large areas with high magnifications, useful for high-redshift galaxy searches ($\sim2$ arcmin$^{2}$ with $μ>5$ to $\sim1$ arcmin$^{2}$ with $μ>10$, similar to a typical \textit{Hubble Frontier Fields} cluster). We also find that MACS J0308.9+2645 hosts a promising, apparently bright (J$\sim23.2-24.6$ AB), multiply imaged high-redshift candidate at $z\sim6.4$. These images are amongst the brightest high-redshift candidates found in RELICS. Our mass models, including magnification maps, are made publicly available for the community through the Mikulski Archive for Space Telescopes.

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