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arXiv 1702.06962astro-ph.GA
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Abell 2744与MUSE和哈勃前沿场图像的强透镜分析

Strong lensing analysis of Abell 2744 with MUSE and Hubble Frontier Fields images

G. Mahler, J. Richard, B. Clément, D. Lagattuta, K. Schmidt, V. Patrício, G. Soucail, R. Bacon, R. Pello, R. Bouwens, M. Maseda, J. Martinez, M. Carollo, H. Ina… 展开作者

G. Mahler, J. Richard, B. Clément, D. Lagattuta, K. Schmidt, V. Patrício, G. Soucail, R. Bacon, R. Pello, R. Bouwens, M. Maseda, J. Martinez, M. Carollo, H. Inami, F. Leclercq, L. Wisotzki

摘要:

我们对MUSE在大质量Frontier Fields星系团Abell 2744上获得的观测结果进行了分析。这个新的数据集覆盖了集群核心周围的整个多重成像区域。我们测量光谱红移的HST选择的连续光源与线发射盲检测数据立方体。合并后的星表包含514个光谱红移(其中有414个新发现),包括156个星团成员和326个放大的背景源。我们使用这种红移信息进行强透镜分析的所有多个图像中发现的深前沿场图像,并添加三个新的MUSE检测到的多重成像系统,没有明显的HST对应。组合的强透镜约束包括总共60个系统,总共产生188张图像,其中29个系统和83张图像被光谱证实,使Abell 2744成为迄今为止约束最好的星系团之一。一个参数质量模型,包括两个集群规模的组件在核心和几个集团规模的子结构在较大的半径准确地再现了所有的光谱多重系统,达到0.67”的均方根在图像平面。总的来说,大量的光谱红移给了我们一个强大的模型,我们估计星系团核心内的质量密度和放大率的系统学通常为~ 9%。

英文摘要:

We present an analysis of MUSE observations obtained on the massive Frontier Fields cluster Abell 2744. This new dataset covers the entire multiply-imaged region around the cluster core. We measure spectroscopic redshifts for HST-selected continuum sources together with line emitters blindly detected in the datacube. The combined catalog consists of 514 spectroscopic redshifts (with 414 new identifications), including 156 cluster members and 326 magnified background sources. We use this redshift information to perform a strong-lensing analysis of all multiple images previously found in the deep Frontier Field images, and add three new MUSE-detected multiply-imaged systems with no obvious HST counterpart. The combined strong lensing constraints include a total of 60 systems producing 188 images altogether, out of which 29 systems and 83 images are spectroscopically confirmed, making Abell 2744 one of the most well-constrained clusters to date. A parametric mass model including two cluster-scale components in the core and several group-scale substructures at larger radii accurately reproduces all the spectroscopic multiple systems, reaching an rms of 0.67" in the image plane. Overall, the large number of spectroscopic redshifts gives us a robust model and we estimate the systematics on the mass density and magnification within the cluster core to be typically ~9%.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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