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arXiv 2102.06351astro-ph.CO
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用单晕透镜模型估算强透镜星系团的核心质量

Core Mass Estimates in Strong Lensing Galaxy Clusters Using a Single-Halo Lens Model

J. D. Remolina González, K. Sharon, N. Li, G. Mahler, L. E. Bleem, M. Gladders, A. Niemiec

摘要:

星系团的核心质量是结构形成的重要探针。在这里,我们评估使用的单晕模型(SHM)作为一种有效的方法来估计强透镜集群核心质量,测试它与射线跟踪图像的“外环”模拟。与详细的透镜模型不同,SHM代表了具有单个晕的集群质量分布,并且可以从测量的透镜约束自动生成。我们发现,用这种方法估计的投影核心质量,M $_{\rm SHM}$,有一个分散的$8.52\%$和$0.90\%$的偏差相比,在同一孔径内的“真实”的质量。我们的分析表明,没有系统的散射或偏差和透镜源系统的属性之间的相关性。通过排除未通过目视检查测试的模型,可将偏差和分散分别降低至$3.26\%$和$0.34\%$。我们发现,SHM的成功取决于透镜的几何形状,与单一的巨弧配置占大多数失败的情况下,由于其限制约束力。当排除这些情况时,我们分别测量$3.88\%$和$0.84\%$的分散和偏差。最后,我们发现,当源的红移是未知的,模型预测的红移被高估,和M $_{\rm SHM}$被低估了几个百分点,突出的重要性,确保背景源的光谱红移。我们的分析提供了一个定量表征的M $_{\rm SHM}$,使其有效地使用作为一种工具来估计强透镜集群核心群众在大样本中,预计从当前和未来的调查。

英文摘要:

The core mass of galaxy clusters is an important probe of structure formation. Here, we evaluate the use of a Single-Halo model (SHM) as an efficient method to estimate the strong lensing cluster core mass, testing it with ray-traced images from the `Outer Rim' simulation. Unlike detailed lens models, the SHM represents the cluster mass distribution with a single halo and can be automatically generated from the measured lensing constraints. We find that the projected core mass estimated with this method, M$_{\rm SHM}$, has a scatter of $8.52\%$ and a bias of $0.90\%$ compared to the "true" mass within the same aperture. Our analysis shows no systematic correlation between the scatter or bias and the lens-source system properties. The bias and scatter can be reduced to $3.26\%$ and $0.34\%$, respectively, by excluding models that fail a visual inspection test. We find that the SHM success depends on the lensing geometry, with single giant arc configurations accounting for most of the failed cases due to their limiting constraining power. When excluding such cases, we measure a scatter and bias of $3.88\%$ and $0.84\%$, respectively. Finally, we find that when the source redshift is unknown, the model-predicted redshifts are overestimated, and the M$_{\rm SHM}$ is underestimated by a few percent, highlighting the importance of securing spectroscopic redshifts of background sources. Our analysis provides a quantitative characterization of M$_{\rm SHM}$, enabling its efficient use as a tool to estimate the strong lensing cluster core masses in the large samples, expected from current and future surveys.

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