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arXiv 1702.04348astro-ph.GAastro-ph.CO
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HST前沿场星系团透镜和宇宙学模拟中的映射子结构

Mapping substructure in the HST Frontier Fields cluster lenses and in cosmological simulations

Priyamvada Natarajan, Urmila Chadayammuri, Mathilde Jauzac, Johan Richard, Jean-Paul Kneib, Harald Ebeling, Fangzhou Jiang, Frank van den Bosch, Marceau Limousi… 展开作者

Priyamvada Natarajan, Urmila Chadayammuri, Mathilde Jauzac, Johan Richard, Jean-Paul Kneib, Harald Ebeling, Fangzhou Jiang, Frank van den Bosch, Marceau Limousin, Eric Jullo, Hakim Atek, Annalisa Pillepich, Cristina Popa, Federico Marinacci, Lars Hernquist, Massimo Meneghetti, Mark Vogelsberger

摘要:

我们绘制了哈勃太空望远镜前沿场计划(HSTFF)观察到的前三个集群中的透镜推断子结构:Abell 2744(z = 0.308),MACSJ 0416(z = 0.396)和MACSJ 1149(z = 0.543)。统计解决暗物质subhaloes下降到~10^{9.5}太阳质量,我们比较派生的subhalo质量函数(SHMF)的理论预测,从分析模型和数值模拟在λ冷暗物质(LCDM)宇宙学。模仿我们在HSTFF中的观测星团成员选择标准,我们报告了40年来在次晕质量(10^{9-13}太阳质量)中SHMF的振幅和形状的极好一致性。投影效应似乎不会引入显着的错误,从模拟SHMF的确定。在星系团尺度上,我们没有发现类似于本星系团中卫星缺失问题的子结构危机的证据,但发现计数匹配的HSTFF SHMF在M_{sub halo} / M_{halo} ~ 10^{-5}之间具有极好的一致性。然而,我们发现的径向分布的子晕推断HSTFF集群透镜相比,从模拟集群的测定的差异。这表明,虽然选定的模拟集群匹配的HSTFF样品的质量,他们没有充分捕捉这些观察到的集群透镜的动力学特性和复杂的合并形态。因此,HSTFF集群可能是在一个短暂的进化阶段,目前在宇宙学模拟采样不足。在集群透镜的暗物质子结构的丰度和质量函数继续提供一个重要的测试LCDM范式,目前我们发现模型预测和观测之间没有紧张关系。

英文摘要:

We map the lensing-inferred substructure in the first three clusters observed by the Hubble Space Telescope Frontier Fields Initiative (HSTFF): Abell 2744 (z = 0.308), MACSJ0416, (z = 0.396) and MACSJ1149 (z = 0.543). Statistically resolving dark-matter subhaloes down to ~10^{9.5} solar masses, we compare the derived subhalo mass functions (SHMFs) to theoretical predictions from analytical models and with numerical simulations in a Lambda Cold Dark Matter (LCDM) cosmology. Mimicking our observational cluster member selection criteria in the HSTFF, we report excellent agreement in both amplitude and shape of the SHMF over four decades in subhalo mass (10^{9-13} solar masses). Projection effects do not appear to introduce significant errors in the determination of SHMFs from simulations. We do not find evidence for a substructure crisis, analogous to the missing satellite problem in the Local Group, on cluster scales, but rather excellent agreement of the count-matched HSTFF SHMF down to M_{sub halo}/M_{halo} ~ 10^{-5}. However, we do find discrepancies in the radial distribution of sub haloes inferred from HSTFF cluster lenses compared to determinations from simulated clusters. This suggests that although the selected simulated clusters match the HSTFF sample in mass, they do not adequately capture the dynamical properties and complex merging morphologies of these observed cluster lenses. Therefore, HSTFF clusters are likely observed in a transient evolutionary stage that is presently insufficiently sampled in cosmological simulations. The abundance and mass function of dark matter substructure in cluster lenses continues to offer an important test of the LCDM paradigm, and at present we find no tension between model predictions and observations.

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