arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2008.04025astro-ph.CO
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在$z \sim 1.1$发现超星系团候选者

Discovery of a supercluster candidate at $z \sim 1.1$

Tapish Narwal, Tomotsugu Goto, Tetsuya Hashimoto, Seong Jin Kim, Chia-Ying Chiang, Yi-Han Wu

摘要:

我们在暗能量巡天科学验证数据中报告了一个在z $\sim 1.1$的遥远超星系团的有希望的候选者。我们研究平滑的半三维星系密度图在各种照片Z切片。在几个过密区域中,在这项工作中,我们报告了最重要的一个具有$3σ$过密的红移为$\sim1.1$,超过$\sim160$兆位差距尺度,远远大于常规的集群规模(几兆位差距)。超星系团的形状在天空投影中不是圆形的。因此,我们把最大过密度点作为定量测量的中心。两种不同的估计表明超星系团的质量是$1.37\substack{+1.31 \\ -0.79} \times 10^{17} M_{\odot}$,比常规的星系团大一个数量级以上。除了在发射线星系中发现的原超星系团外,这可能是迄今为止由规则星系定义的最遥远的超星系团。光谱学的证实将使它成为宇宙学中一个非常有趣的物体。我们讨论了这种大质量结构对$Λ$ CDM宇宙学的可能影响。

英文摘要:

We report a promising candidate for a distant supercluster at z $\sim 1.1$ in the Dark Energy Survey Science Verification data. We examine smoothed semi-3D galaxy density maps in various photo-z slices. Among several overdense regions, in this work we report the most significant one as having a $3σ$ overdensity at a redshift of $\sim1.1$, over a $\sim160$ Mpc scale, much larger than the regular cluster scale (several Mpc). The shape of the supercluster is not circular in the sky projection. Therefore, we regard the point of maximum overdensity as the center for quantitative measurements. Two different estimates suggest the mass of the supercluster to be $1.37\substack{+1.31 \\ -0.79} \times 10^{17} M_{\odot}$, more than one order more massive than regular galaxy clusters. Except for protosuperclusters found with emission-line galaxies, this could be the most distant supercluster to date defined by regular galaxies. A spectroscopic confirmation would make this a very interesting object for cosmology. We discuss the possible implications of such a massive structure for $Λ$CDM cosmology.

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