Euclid 和 KiDS-1000：量化源-镜 clustering 对宇宙剪切分析的影响
宇宙学与河外天体物理
2025-01-29 v2
摘要
从当前如千度级测绘 (KiDS) 等第三阶段观测迈向第四阶段如 Euclid 的更大面积和更宽广红移范围，将显著提高弱引力分析的精度。然而，随着精度的提升，对模型假设的准确性也需要评估。本研究量化了弱引力源星系与周围大尺度结构相关聚类的影响，称为源-镜 clustering (SLC)，这在实际中常被忽略。为此，我们使用具有真实星系分布的模拟宇宙数据集，对 clustered 和均匀分布的源星系计算剪切相关函数。对两种情景进行宇宙学分析，以量化 SLC 对 KiDS 类和 Euclid 类设置下参数推断的影响。我们发现对于第三阶段观测，当考虑针对本征错位和切片移动的扰动参数时，SLC 影响较小，因为这些扰动参数吸收了 SLC 的效应，从而改变了其原始含义。对于 KiDS (Euclid)，推断得到的本征错位�幅 从 () (无 SLC 时) 变为 () (有 SLC 时)。然而，固定扰动参数会导致 和 偏移，这强调了在建模中包含 SLC 的必要性。对于 Euclid，当使用自由扰动参数时，、 和 分别偏移 、 和 ；当固定扰动参数时，分别偏移 、 和 。因此，仅凭 SLC 本身在使用非信息性先验对扰动参数进行约束时，对推断参数的影响仅有限。
关键词
引用
@article{arxiv.2407.09810,
title = {Euclid and KiDS-1000: Quantifying the impact of source-lens clustering on cosmic shear analyses},
author = {L. Linke and S. Unruh and A. Wittje and T. Schrabback and S. Grandis and M. Asgari and A. Dvornik and H. Hildebrandt and H. Hoekstra and B. Joachimi and R. Reischke and J. L. van den Busch and A. H. Wright and P. Schneider and N. Aghanim and B. Altieri and A. Amara and S. Andreon and N. Auricchio and C. Baccigalupi and M. Baldi and S. Bardelli and D. Bonino and E. Branchini and M. Brescia and J. Brinchmann and S. Camera and V. Capobianco and C. Carbone and V. F. Cardone and J. Carretero and S. Casas and F. J. Castander and M. Castellano and S. Cavuoti and A. Cimatti and G. Congedo and C. J. Conselice and L. Conversi and Y. Copin and F. Courbin and H. M. Courtois and A. Da Silva and H. Degaudenzi and J. Dinis and M. Douspis and F. Dubath and X. Dupac and S. Dusini and M. Farina and S. Farrens and S. Ferriol and P. Fosalba and M. Frailis and E. Franceschi and M. Fumana and S. Galeotta and B. Gillis and C. Giocoli and A. Grazian and F. Grupp and L. Guzzo and S. V. H. Haugan and W. Holmes and I. Hook and F. Hormuth and A. Hornstrup and P. Hudelot and K. Jahnke and E. Keihänen and S. Kermiche and A. Kiessling and M. Kilbinger and T. Kitching and B. Kubik and K. Kuijken and M. Kümmel and M. Kunz and H. Kurki-Suonio and S. Ligori and P. B. Lilje and V. Lindholm and I. Lloro and D. Maino and E. Maiorano and O. Mansutti and O. Marggraf and K. Markovic and N. Martinet and F. Marulli and R. Massey and H. J. McCracken and E. Medinaceli and S. Mei and Y. Mellier and M. Meneghetti and E. Merlin and G. Meylan and M. Moresco and L. Moscardini and E. Munari and R. Nakajima and R. C. Nichol and S. -M. Niemi and J. W. Nightingale and C. Padilla and S. Paltani and F. Pasian and K. Pedersen and V. Pettorino and S. Pires and G. Polenta and M. Poncet and L. A. Popa and F. Raison and R. Rebolo and A. Renzi and J. Rhodes and G. Riccio and E. Romelli and M. Roncarelli and R. Saglia and Z. Sakr and D. Sapone and B. Sartoris and M. Schirmer and A. Secroun and G. Seidel and S. Serrano and C. Sirignano and G. Sirri and L. Stanco and J. -L. Starck and P. Tallada-Crespí and A. N. Taylor and I. Tereno and R. Toledo-Moreo and F. Torradeflot and I. Tutusaus and L. Valenziano and T. Vassallo and G. Verdoes Kleijn and A. Veropalumbo and Y. Wang and J. Weller and G. Zamorani and E. Zucca and C. Burigana and A. Pezzotta and C. Porciani and V. Scottez and M. Viel and A. M. C. Le Brun},
journal= {arXiv preprint arXiv:2407.09810},
year = {2025}
}
备注
17 pages plus appendix, 10 figures, replaced by version accepted by Astronomy & Astrophysics. Abstract abridged on arXiv