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arXiv 2303.09568astro-ph.COastro-ph.GA
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RXJ0437 +00:用奇异引力透镜约束暗物质

RXJ0437+00: Constraining Dark Matter with Exotic Gravitational Lenses

David J. Lagattuta, Johan Richard, Harald Ebeling, Quentin Basto, Catherine Cerny, Alastair Edge, Mathilde Jauzac, Guillaume Mahler, Richard Massey

摘要:

本文首次对星系团RXJ 0437.1 +0043(RXJ 0437; z = 0.285)进行了强引力透镜分析。新获得的深MUSE观测,Keck/MOSFIRE近红外光谱和哈勃太空望远镜SNAPshot成像揭示了13个多重成像的背景星系,其中三个(z=1.98,2.97和6.02,分别)在双曲脐(H-U)透镜配置。H-U图像距离星团中心仅20 - 50 kpc,即,在爱因斯坦半径内的距离处,来自其他透镜配置的图像被缩小并且通常不可观察。非常罕见(以前只知道一个H-U透镜),这些系统能够限制质量分布的内部斜率-与径向弧不同,H-U配置的存在并不偏向浅核。被RXJ 0437透镜化的星系被放大了30到300倍,并且(在H-U系统的情况下)几乎各向同性地拉伸。利用这种极端的放大倍数,我们演示了如何源星系在H-U系统可以用来探测小尺度($\sim 10^{9} M_{\odot}$)的子结构,提供额外的洞察暗物质的性质。

英文摘要:

We present the first strong-gravitational-lensing analysis of the galaxy cluster RXJ0437.1+0043 (RXJ0437; z = 0.285). Newly obtained, deep MUSE observations, Keck/MOSFIRE near-infrared spectroscopy, and Hubble Space Telescope SNAPshot imaging reveal 13 multiply imaged background galaxies, three of them (at z=1.98, 2.97, and 6.02, respectively) in hyperbolic umbilic (H-U) lensing configurations. The H-U images are located only 20 -- 50 kpc from the cluster centre, i.e., at distances well inside the Einstein radius where images from other lens configurations are demagnified and often unobservable. Extremely rare (only one H-U lens was known previously) these systems are able to constrain the inner slope of the mass distribution -- and unlike radial arcs, the presence of H-U configurations is not biased towards shallow cores. The galaxies lensed by RXJ0437 are magnified by factors ranging from 30 to 300 and (in the case of H-U systems) stretched nearly isotropically. Taking advantage of this extreme magnification, we demonstrate how the source galaxies in H-U systems can be used to probe for small-scale ($\sim 10^{9} M_{\odot}$) substructures, providing additional insight into the nature of dark matter.

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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