Voronoi曲面细分与非参数晕集中
Voronoi Tessellation and Non-parametric Halo Concentration
摘要：
我们提出并测试TesseRACt，一个非参数的技术恢复浓度的模拟暗物质晕Voronoi镶嵌。TesseRACt是测试理想化的N体晕，轴对称，三轴，并包含子结构和传统的最小二乘拟合相比，以及两个非参数技术，假设球对称。TesseRACt恢复晕浓度在0.3%的真实值，无论晕是球形，轴对称，或三轴。假设球形对称的传统拟合和非参数技术可以返回系统偏离非球形晕真实值高达10%的浓度。当在$0.5R_{200}$外部存在子结构时，TesseRACt的性能也明显更好。考虑到宇宙晕很少是球形的，往往包含子结构，我们讨论了在宇宙学N体模拟晕浓度的研究，包括如何选择测量浓度的技术可能会偏置标度关系的影响。
英文摘要：
We present and test TesseRACt, a non-parametric technique for recovering the concentration of simulated dark matter halos using Voronoi tessellation. TesseRACt is tested on idealized N-body halos that are axisymmetric, triaxial, and contain substructure and compared to traditional least-squares fitting as well as two non-parametric techniques that assume spherical symmetry. TesseRACt recovers halo concentrations within 0.3% of the true value regardless of whether the halo is spherical, axisymmetric, or triaxial. Traditional fitting and non-parametric techniques that assume spherical symmetry can return concentrations that are systematically off by as much as 10% from the true value for non-spherical halos. TesseRACt also performs significantly better when there is substructure present outside $0.5R_{200}$. Given that cosmological halos are rarely spherical and often contain substructure, we discuss implications for studies of halo concentration in cosmological N-body simulations including how choice of technique for measuring concentration might bias scaling relations.
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