Effects of large-scale structure on the accuracy of weak lensing mass measurements
Effects of large-scale structure on the accuracy of weak lensing mass measurements
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DOI：
10.1111/j.1365-2966.2010.18053.x
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发表时间：
2010-11
期刊：
影响因子：
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通讯作者：
H. Hoekstra;J. Hartlap;S. Hilbert;E. V. Uitert
中科院分区：
文献类型：
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作者：
H. Hoekstra;J. Hartlap;S. Hilbert;E. V. Uitert
弱引力透镜效应已成为确定星系团质量的重要方法。星系的固有形状是不确定性的主要来源，但对于可以实现的精度还有其他限制。在本文中，我们重新审视了一个通常被忽视的不确定性来源：结构沿着视线。使用从千年模拟的结果，我们确认的有效性分析计算表明，这种随机预测是特别重要的集群密度分布的研究。一般来说，大尺度结构对总误差预算的贡献与统计误差相当。我们发现，质量测量的精度可以通过使用现成的数据建模的大规模结构，只有轻微的改善。
Weak gravitational lensing has become an important method to determine the masses of galaxy clusters. The intrinsic shapes of the galaxies are a dominant source of uncertainty, but there are other limitations to the precision that can be achieved. In this paper we revisit a typically ignored source of uncertainty: structure along the line-of sight. Using results from the Millennium Simulation we confirm the validity of analytical calculations that have shown that such random projections are particularly important for studies of the cluster density profile. In general the contribution of large-scale structure to the total error budget is comparable to the statistical errors. We find that the precision of the mass measurement can be improved only slightly by modelling the large-scale structure using readily available data.