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首页> 外文期刊>The Astrophysical Journal. Letters >Clash: The enhanced lensing efficiency of the highly elongated merging cluster macs J0416.1-2403
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Clash: The enhanced lensing efficiency of the highly elongated merging cluster macs J0416.1-2403

机译：冲突：高度拉长的合并群集Mac J0416.1-2403的增强的镜头效率

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摘要

We perform a strong lensing analysis of the merging galaxy cluster MACS J0416.1-2403 (M0416; z = 0.42) in recent CLASH/HST observations. We identify 70 new multiple images and candidates of 23 background sources in the range 0.7 ? z_(phot) ? 6.14 including two probable high-redshift dropouts, revealing a highly elongated lens with axis ratio ?5:1, and a major axis of ～100″ (z_s ～ 2). Compared to other well-studied clusters, M0416 shows an enhanced lensing efficiency. Although the critical area is not particularly large (? 0.6 □' z_s ～ 2), the number of multiple images, per critical area, is anomalously high. We calculate that the observed elongation boosts the number of multiple images, per critical area, by a factor of ～2.5 ×, due to the increased ratio of the caustic area relative to the critical area. Additionally, we find that the observed separation between the two main mass components enlarges the critical area by a factor of ～2. These geometrical effects can account for the high number (density) of multiple images observed. We find in numerical simulations that only ～4% of the clusters (with M_(vir) ≥ 6 × 10 ~(14) h ~(-1) M_⊙) exhibit critical curves as elongated as in M0416.
机译：在最近的CLASH / HST观测中，我们对合并的银河星系团MACS J0416.1-2403（M0416; z = 0.42）进行了强有力的分析。我们识别出70幅新的多幅图像，以及23种背景源的候选图像，范围为0.7？ z_（phot）吗？图6.14包括两个可能的高红移丢失，显示出一个高度伸长的透镜，轴比为？5：1，长轴为〜100英寸（z_s〜2）。与其他经过充分研究的群集相比，M0416的镜头效率更高。尽管临界区域不是特别大（？0.6□'z_s〜2），但是每个临界区域的多个图像的数量异常高。我们计算出，由于苛性区域相对于关键区域的比例增加，观察到的伸长率将每个关键区域的多个图像数量提高了约2.5倍。此外，我们发现观察到的两个主要质量成分之间的分离将临界面积扩大了约2倍。这些几何效果可以解释所观察到的多个图像的高数量（密度）。在数值模拟中我们发现，只有约4％的簇（M_（vir）≥6×10〜（14）h〜（-1）M_⊙）表现出与M0416一样拉长的临界曲线。

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