Euclid 准备工作 LX。将 HST 图像作为弱引力图像模拟的输入
宇宙学与河外天体物理
2025-01-16 v1
摘要
Euclid 太空望远镜的数据将实现极小统计误差的 cosmic shear 测量，需相应的系统误差控制水平。校正 shear 偏差的常用方法涉及使用已知输入 shear 的图像模拟来校准 shape 测量方法。鉴于其高分辨率，哈勃空间望远镜（HST）星系可原则上用于模拟 Euclid 观测。本文采用 GalSim 基于测试环境来调查 HST 点扩散函数（PSF）模型或数据处理技术的不确定性是否在弱引力（WL）shear 校准中引入显著偏差。我们使用单 S\'ersic 星系模型模拟了 HST 和 Euclid 观测。随后我们对 HST 模拟进行“Euclid 化”处理，并将结果与直接模拟的 Euclid 类图像进行比较。为进行此比较，我们利用基于矩的 shape 测量算法和星系模型拟合。通过 Euclid 化程序，我们有效地将残余乘性偏差 in shear 测量降低到亚百分之一水平。这一成就得益于采用仪器的 native 像素尺度、利用 Lanczos15 插值核、纠正噪声相关性以及确保模拟分支之间的星系信噪比一致。然而，Euclid 化程序需要进一步分析其对相关噪声的影响，以估计校准偏差。此外，我们对 TinyTim HST PSF 模型的准确性进行了深入分析，利用 F606W 和 F814W 滤镜中观察到的星场进行分析。我们观察到 F606W 图像在恢复的最佳焦点中呈现更广泛的散布，与 F814W 滤镜的结果不同。
引用
@article{arxiv.2501.08372,
title = {Euclid preparation LX. The use of HST images as input for weak-lensing image simulations},
author = {Euclid Collaboration and D. Scognamiglio and T. Schrabback and M. Tewes and B. Gillis and H. Hoekstra and E. M. Huff and O. Marggraf and T. Kitching and R. Massey and I. Tereno and C. S. Carvalho and A. Robertson and G. Congedo 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 P. Battaglia and C. Bodendorf 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 G. Castignani and S. Cavuoti and A. Cimatti and C. Colodro-Conde and C. J. Conselice and L. Conversi and Y. Copin and F. Courbin and H. M. Courtois and M. Cropper and A. Da Silva and H. Degaudenzi and G. De Lucia and A. M. Di Giorgio and J. Dinis and F. Dubath and C. A. J. Duncan 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 S. Galeotta and C. Giocoli and P. Gómez-Alvarez and A. Grazian and F. Grupp and L. Guzzo and S. V. H. Haugan and W. Holmes and F. Hormuth and A. Hornstrup and P. Hudelot and K. Jahnke and B. Joachimi and E. Keihänen and S. Kermiche and A. Kiessling and M. Kilbinger and B. Kubik and M. Kümmel and M. Kunz and H. Kurki-Suonio and S. Ligori and P. B. Lilje and V. Lindholm and I. Lloro and G. Mainetti and E. Maiorano and O. Mansutti and K. Markovic and M. Martinelli and N. Martinet and F. Marulli and E. Medinaceli and S. Mei and Y. Mellier and M. Meneghetti and G. Meylan and M. Moresco and L. Moscardini and R. Nakajima and S. -M. Niemi and J. W. Nightingale and C. Padilla and S. Paltani and F. Pasian and K. Pedersen and S. Pires and G. Polenta and M. Poncet and L. A. Popa and L. Pozzetti and F. Raison and R. Rebolo and A. Renzi and J. Rhodes and G. Riccio and E. Romelli and M. Roncarelli and E. Rossetti and R. Saglia and Z. Sakr and A. G. Sánchez and D. Sapone and B. Sartoris and R. Scaramella and M. Schirmer and P. Schneider and A. Secroun and G. Seidel and S. Serrano and C. Sirignano and G. Sirri and J. Skottfelt and L. Stanco and J. -L. Starck and J. Steinwagner and P. Tallada-Crespí and A. N. Taylor and H. I. Teplitz 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 M. Wetzstein and G. Zamorani and E. Zucca and A. Biviano and M. Bolzonella and A. Boucaud and E. Bozzo and C. Burigana and M. Calabrese and J. A. Escartin Vigo and J. Gracia-Carpio and N. Mauri and A. Pezzotta and M. Pöntinen and C. Porciani and V. Scottez and M. Tenti and M. Viel and M. Wiesmann and Y. Akrami and V. Allevato and S. Anselmi and M. Ballardini and L. Blot and S. Borgani and S. Bruton and R. Cabanac and A. Calabro and A. Cappi and T. Castro and K. C. Chambers and S. Contarini and A. R. Cooray and S. Davini and B. De Caro and G. Desprez and A. Díaz-Sánchez and S. Di Domizio and H. Dole and S. Escoffier and A. G. Ferrari and I. Ferrero and F. Fornari and L. Gabarra and K. Ganga and J. García-Bellido and E. Gaztanaga and F. Giacomini and F. Gianotti and G. Gozaliasl and A. Hall and S. Hemmati and H. Hildebrandt and J. Hjorth and A. Jimenez Muñoz and J. J. E. Kajava and V. Kansal and D. Karagiannis and C. C. Kirkpatrick and J. Le Graet and L. Legrand and A. Loureiro and J. Macias-Perez and G. Maggio and M. Magliocchetti and F. Mannucci and R. Maoli and C. J. A. P. Martins and S. Matthew and L. Maurin and R. B. Metcalf and P. Monaco and C. Moretti and G. Morgante and Nicholas A. Walton and L. Patrizii and V. Popa and D. Potter and P. Reimberg and I. Risso and P. -F. Rocci and R. P. Rollins and M. Sahlén and A. Schneider and M. Sereno and P. Simon and A. Spurio Mancini and K. Tanidis and C. Tao and G. Testera and R. Teyssier and S. Toft and S. Tosi and A. Troja and M. Tucci and C. Valieri and J. Valiviita and D. Vergani and G. Verza},
journal= {arXiv preprint arXiv:2501.08372},
year = {2025}
}
备注
Accepted by A&A. 23 pages, 20 figures, Euclid pre-launch key paper