Euclid: 对 $k$-截断 $3 \times 2$ 点统计的预报
宇宙学与河外天体物理
2021-07-21 v2
摘要
小尺度(即功率谱 中的高 )的建模不确定性,源于重子反馈、非线性结构增长以及星系为有偏示踪体,这构成了充分利用 {\it Euclid} 广角巡天约束能力的重大障碍。-截断宇宙剪切近期被提出作为一种最优去除对这些尺度敏感性同时保留可用信息的方法。本文我们将 -截断宇宙剪切形式推广到 点统计,并估计在 {\it Euclid} 数据的 点分析中不同 -截断的信息损失。扩展~\citet{blanchard2019euclid} 的 Fisher 矩阵分析,我们评估不同 -截断下约束能力的退化。我们在理想化情形下工作,假设星系偏倚为线性、协方差为高斯,同时忽略由测光红移误差和重子反馈引起的不确定性。我们发现取 -截断为 给出暗能量优值(FOM)为 1018。这与在传统 点分析中取弱透镜截断 、星系成团与星系-星系透镜截断 相当。我们还发现分析中测光成团部分所用观测星系的比例是 FOM 的主要驱动因素之一。移除 的成团星系使 FOM 降低 。鉴于 FOM 如此严重依赖于成团分析所用星系比例,应付出大量努力以处理将分析扩展到亮红星系(LRG)样本之外时存在的现实系统误差。
引用
@article{arxiv.2012.04672,
title = {Euclid: Forecasts for $k$-cut $3 \times 2$ Point Statistics},
author = {P. L. Taylor and T. Kitching and V. F. Cardone and A. Ferté and E. M. Huff and F. Bernardeau and J. Rhodes and A. C. Deshpande and I. Tutusaus and A. Pourtsidou and S. Camera and C. Carbone and S. Casas and M. Martinelli and V. Pettorino and Z. Sakr and D. Sapone and V. Yankelevich and N. Auricchio and A. Balestra and C. Bodendorf and D. Bonino and A. Boucaud and E. Branchini and M. Brescia and V. Capobianco and J. Carretero and M. Castellano and S. Cavuoti and A. Cimatti and R. Cledassou and G. Congedo and L. Conversi and L. Corcione and M. Cropper and E. Franceschi and B. Garilli and B. Gillis and C. Giocoli and L. Guzzo and S. V. H. Haugan and W. Holmes and F. Hormuth and K. Jahnke and S. Kermiche and M. Kilbinger and M. Kunz and H. Kurki-Suonio and S. Ligori and P. B. Lilje and I. Lloro and O. Marggraf and K. Markovic and R. Massey and E. Medinaceli and S. Mei and M. Meneghetti and G. Meylan and M. Moresco and B. Morin and L. Moscardini and S. Niemi and C. Padilla and S. Paltani and F. Pasian and K. Pedersen and W. J. Percival and S. Pires and G. Polenta and M. Poncet and L. Popa and F. Raison and M. Roncarelli and E. Rossetti and R. Saglia and P. Schneider and A. Secrou and G. Seidel and S. Serrano and C. Sirignano and G. Sirri and F. Sureau and P. Tallada Crespí and D. Tavagnacco and A. N. Taylor and H. I. Teplitz and I. Tereno and R. Toledo-Moreo and E. A. Valentijn and L. Valenziano and T. Vassallo and Y. Wang and J. Weller and A. Zacchei and J. Zoubian},
journal= {arXiv preprint arXiv:2012.04672},
year = {2021}
}
备注
10 pages, 5 figures. Accepted by the Open Journal of Astrophysics