DES Y3 结果：图像模拟中的剪切与红移偏差混合效应
宇宙学与河外天体物理
2022-01-27 v2
摘要
随着星系弱引力透镜的统计能力达到百分级精度，需要大型、真实且稳健的模拟来校准观测系统误差，尤其是考虑到随着巡天深度增加，天体混合（blending）的重要性上升。为捕捉剪切与测光红移定标中混合的耦合效应，我们定义了用于透镜的有效红移分布 ，并描述了如何利用图像模拟估计它。我们使用一套广泛的定制图像模拟来刻画应用于暗能量巡天（DES）第三年数据集的剪切估计流程的性能。我们描述了多波段、多历元模拟，并通过与真实 DES 数据比较展示了其高度真实性。我们通过运行基准模拟的变体来隔离产生剪切校准偏差的效应，发现与混合相关的效应是约 的平均乘性偏差的主要贡献。通过生成输入剪切信号随红移变化的模拟，我们校准了有效红移分布估计中的偏差，并证明了在存在混合时该方案的重要性。我们提供了包含统计与系统不确定性的修正有效红移分布，可供 DES 第三年弱引力透镜分析直接使用。
引用
@article{arxiv.2012.08567,
title = {DES Y3 results: Blending shear and redshift biases in image simulations},
author = {N. MacCrann and M. R. Becker and J. McCullough and A. Amon and D. Gruen and M. Jarvis and A. Choi and M. A. Troxel and E. Sheldon and B. Yanny and K. Herner and S. Dodelson and J. Zuntz and K. Eckert and R. P. Rollins and T. N. Varga and G. M. Bernstein and R. A. Gruendl and I. Harrison and W. G. Hartley and I. Sevilla-Noarbe and A. Pieres and S. L. Bridle and J. Myles and A. Alarcon and S. Everett and C. Sánchez and E. M. Huff and F. Tarsitano and M. Gatti and L. F. Secco and T. M. C. Abbott and M. Aguena and S. Allam and J. Annis and D. Bacon and E. Bertin and D. Brooks and D. L. Burke and A. Carnero Rosell and M. Carrasco Kind and J. Carretero and M. Costanzi and M. Crocce and M. E. S. Pereira and J. De Vicente and S. Desai and H. T. Diehl and J. P. Dietrich and P. Doel and T. F. Eifler and I. Ferrero and A. Ferté and B. Flaugher and P. Fosalba and J. Frieman and J. García-Bellido and E. Gaztanaga and D. W. Gerdes and T. Giannantonio and J. Gschwend and G. Gutierrez and S. R. Hinton and D. L. Hollowood and K. Honscheid and D. J. James and O. Lahav and M. Lima and M. A. G. Maia and M. March and J. L. Marshall and P. Martini and P. Melchior and F. Menanteau and R. Miquel and J. J. Mohr and R. Morgan and J. Muir and R. L. C. Ogando and A. Palmese and F. Paz-Chinchón and A. A. Plazas and M. Rodriguez-Monroy and A. Roodman and S. Samuroff and E. Sanchez and V. Scarpine and S. Serrano and M. Smith and M. Soares-Santos and E. Suchyta and M. E. C. Swanson and G. Tarle and D. Thomas and C. To and R. D. Wilkinson},
journal= {arXiv preprint arXiv:2012.08567},
year = {2022}
}
备注
Submitted to MNRAS. See https://www.darkenergysurvey.org/des-year-3-cosmology-results-papers/ for the full DES Y3 cosmology release. Version accepted by mnras