利用 DES Year 3 弱引力透镜数据探测源聚类对高阶统计量的显著影响
宇宙学与河外天体物理
2023-07-31 v2
摘要
我们展示并测量了源星系聚类对弱引力透镜数据高阶汇总统计量的影响。通过比较星系示踪或不示踪底层密度场的模拟数据，我们表明对于某些分析选择，该效应可超过常见高阶统计量的测量不确定性。源聚类效应在小尺度上以及应用于低红移与高红移样本组合的统计量时更大，并在高红移时减弱。我们评估了对不同弱透镜观测量的影响，发现三阶矩和小波相位谐波比峰值计数统计受更大影响。利用暗能量巡天（Dark Energy Survey）Year 3 数据，我们构建了无源聚类的零检验，使用三阶图矩得到 -value 为 （2.6 ），使用小波相位谐波得到 （6.5 ）。源聚类对宇宙学推断的影响既可被纳入模型，也可通过\textit{ad-hoc}程序（如尺度截断）最小化。我们验证了现有 DES Y3 宇宙学分析（使用图矩和峰值）所采用的程序已足以使该效应可忽略。若未考虑源聚类，会显著影响来自高阶引力透镜统计的宇宙学推断，例如高阶 N 点函数、小波矩观测量（包括相位谐波和散射变换），以及弱透镜图的深度学习或场级汇总统计。我们提供了最小化源聚类影响以及将源聚类效应纳入前向建模模拟数据的方案。
引用
@article{arxiv.2307.13860,
title = {Detection of the significant impact of source clustering on higher-order statistics with DES Year 3 weak gravitational lensing data},
author = {M. Gatti and N. Jeffrey and L. Whiteway and V. Ajani and T. Kacprzak and D. Zürcher and C. Chang and B. Jain and J. Blazek and E. Krause and A. Alarcon and A. Amon and K. Bechtol and M. Becker and G. Bernstein and A. Campos and R. Chen and A. Choi and C. Davis and J. Derose and H. T. Diehl and S. Dodelson and C. Doux and K. Eckert and J. Elvin-Poole and S. Everett and A. Ferte and D. Gruen and R. Gruendl and I. Harrison and W. G. Hartley and K. Herner and E. M. Huff and M. Jarvis and N. Kuropatkin and P. F. Leget and N. MacCrann and J. McCullough and J. Myles and A. Navarro-Alsina and S. Pandey and J. Prat and M. Raveri and R. P. Rollins and A. Roodman and C. Sanchez and L. F. Secco and I. Sevilla-Noarbe and E. Sheldon and T. Shin and M. Troxel and I. Tutusaus and T. N. Varga and B. Yanny and B. Yin and Y. Zhang and J. Zuntz and S. S. Allam and O. Alves and M. Aguena and D. Bacon and E. Bertin and D. Brooks and D. L. Burke and A. Carnero Rosell and J. Carretero and R. Cawthon and L. N. da Costa and T. M. Davis and J. De Vicente and S. Desai and P. Doel and J. García-Bellido and G. Giannini and G. Gutierrez and I. Ferrero and J. Frieman and S. R. Hinton and D. L. Hollowood and K. Honscheid and D. J. James and K. Kuehn and O. Lahav and J. L. Marshall and J. Mena-Fernández and R. Miquel and R. L. C. Ogando and A. Palmese and M. E. S. Pereira and A. A. Plazas Malagón and M. Rodriguez-Monroy and S. Samuroff and E. Sanchez and M. Schubnell and M. Smith and F. Sobreira and E. Suchyta and M. E. C. Swanson and G. Tarle and N. Weaverdyck and P. Wiseman},
journal= {arXiv preprint arXiv:2307.13860},
year = {2023}
}
备注
5 pages, 2 figures, submitted to MNRAS Letters