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arXiv 2501.08372astro-ph.CO
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Euclid筹备工作LX. 将HST图像用作弱引力透镜图像模拟的输入

Euclid preparation LX. The use of HST images as input for weak-lensing image simulations

Euclid Collaboration, D. Scognamiglio, T. Schrabback, M. Tewes, B. Gillis, H. Hoekstra, E. M. Huff, O. Marggraf, T. Kitching, R. Massey, I. Tereno, C. S. Carval… 展开作者

Euclid Collaboration, D. Scognamiglio, T. Schrabback, M. Tewes, B. Gillis, H. Hoekstra, E. M. Huff, O. Marggraf, T. Kitching, R. Massey, I. Tereno, C. S. Carvalho, A. Robertson, G. Congedo, N. Aghanim, B. Altieri, A. Amara, S. Andreon, N. Auricchio, C. Baccigalupi, M. Baldi, S. Bardelli, P. Battaglia, C. Bodendorf, D. Bonino, E. Branchini, M. Brescia, J. Brinchmann, S. Camera, V. Capobianco, C. Carbone, V. F. Cardone, J. Carretero, S. Casas, F. J. Castander, M. Castellano, G. Castignani, S. Cavuoti, A. Cimatti, C. Colodro-Conde, C. J. Conselice, L. Conversi, Y. Copin, F. Courbin, H. M. Courtois, M. Cropper, A. Da Silva, H. Degaudenzi, G. De Lucia, A. M. Di Giorgio, J. Dinis, F. Dubath, C. A. J. Duncan, X. Dupac, S. Dusini, M. Farina, S. Farrens, S. Ferriol, P. Fosalba, M. Frailis, E. Franceschi, S. Galeotta, C. Giocoli, P. Gómez-Alvarez, A. Grazian, F. Grupp, L. Guzzo, S. V. H. Haugan, W. Holmes, F. Hormuth, A. Hornstrup, P. Hudelot, K. Jahnke, B. Joachimi, E. Keihänen, S. Kermiche, A. Kiessling, M. Kilbinger, B. Kubik, M. Kümmel, M. Kunz, H. Kurki-Suonio, S. Ligori, P. B. Lilje, V. Lindholm, I. Lloro, G. Mainetti, E. Maiorano, O. Mansutti, K. Markovic, M. Martinelli, N. Martinet, F. Marulli, E. Medinaceli, S. Mei, Y. Mellier, M. Meneghetti, G. Meylan, M. Moresco, L. Moscardini, R. Nakajima, S. -M. Niemi, J. W. Nightingale, C. Padilla, S. Paltani, F. Pasian, K. Pedersen, S. Pires, G. Polenta, M. Poncet, L. A. Popa, L. Pozzetti, F. Raison, R. Rebolo, A. Renzi, J. Rhodes, G. Riccio, E. Romelli, M. Roncarelli, E. Rossetti, R. Saglia, Z. Sakr, A. G. Sánchez, D. Sapone, B. Sartoris, R. Scaramella, M. Schirmer, P. Schneider, A. Secroun, G. Seidel, S. Serrano, C. Sirignano, G. Sirri, J. Skottfelt, L. Stanco, J. -L. Starck, J. Steinwagner, P. Tallada-Crespí, A. N. Taylor, H. I. Teplitz, R. Toledo-Moreo, F. Torradeflot, I. Tutusaus, L. Valenziano, T. Vassallo, G. Verdoes Kleijn, A. Veropalumbo, Y. Wang, J. Weller, M. Wetzstein, G. Zamorani, E. Zucca, A. Biviano, M. Bolzonella, A. Boucaud, E. Bozzo, C. Burigana, M. Calabrese, J. A. Escartin Vigo, J. Gracia-Carpio, N. Mauri, A. Pezzotta, M. Pöntinen, C. Porciani, V. Scottez, M. Tenti, M. Viel, M. Wiesmann, Y. Akrami, V. Allevato, S. Anselmi, M. Ballardini, L. Blot, S. Borgani, S. Bruton, R. Cabanac, A. Calabro, A. Cappi, T. Castro, K. C. Chambers, S. Contarini, A. R. Cooray, S. Davini, B. De Caro, G. Desprez, A. Díaz-Sánchez, S. Di Domizio, H. Dole, S. Escoffier, A. G. Ferrari, I. Ferrero, F. Fornari, L. Gabarra, K. Ganga, J. García-Bellido, E. Gaztanaga, F. Giacomini, F. Gianotti, G. Gozaliasl, A. Hall, S. Hemmati, H. Hildebrandt, J. Hjorth, A. Jimenez Muñoz, J. J. E. Kajava, V. Kansal, D. Karagiannis, C. C. Kirkpatrick, J. Le Graet, L. Legrand, A. Loureiro, J. Macias-Perez, G. Maggio, M. Magliocchetti, F. Mannucci, R. Maoli, C. J. A. P. Martins, S. Matthew, L. Maurin, R. B. Metcalf, P. Monaco, C. Moretti, G. Morgante, Nicholas A. Walton, L. Patrizii, V. Popa, D. Potter, P. Reimberg, I. Risso, P. -F. Rocci, R. P. Rollins, M. Sahlén, A. Schneider, M. Sereno, P. Simon, A. Spurio Mancini, K. Tanidis, C. Tao, G. Testera, R. Teyssier, S. Toft, S. Tosi, A. Troja, M. Tucci, C. Valieri, J. Valiviita, D. Vergani, G. Verza

AI总结:

本研究探究HST图像用于Euclid弱引力透镜剪切校准模拟的可行性,通过Euclid化流程将剪切残余乘性偏差降至亚百分比水平,同时分析了TinyTim HST PSF模型在不同滤光片下的精度差异。

摘要:

Euclid空间望远镜的数据将能实现统计误差极小的宇宙剪切测量,这要求相应的系统误差控制水平。校正剪切偏差的一种常用方法是使用具有已知输入剪切的图像模拟来校准形状测量方法。鉴于哈勃空间望远镜(HST)的高分辨率,其星系图像原则上可用于模拟Euclid的观测结果。在本研究中,我们采用基于GalSim(一种引力透镜图像模拟工具)的测试环境,探究HST点扩散函数(PSF)模型或数据处理技术中的不确定性是否会在弱引力透镜(WL)剪切校准中引入显著偏差。我们使用单Sérsic星系模型来模拟HST和Euclid的观测结果,随后对HST模拟结果进行“Euclid化”处理,并将结果与直接模拟的类Euclid图像进行对比。本次对比采用了基于矩的形状测量算法和星系模型拟合方法。通过Euclid化流程,我们有效地将剪切测量中的残余乘性偏差降至亚百分比水平。这一成果的实现得益于以下措施:采用仪器的原生像素尺度、使用Lanczos15插值核、校正噪声相关性,以及确保不同模拟分支之间的星系信噪比一致。不过,Euclid化流程还需进一步分析相关噪声的影响,以估算校准偏差。此外,我们利用F606W和F814W滤光片下观测的星场,对TinyTim HST PSF模型的精度开展了深入分析。我们观察到,与F814W滤光片的图像相比,F606W图像在恢复的最佳拟合焦点上表现出更大的离散度。

英文摘要:

Data from the Euclid space telescope will enable cosmic shear measurements with very small statistical errors, requiring corresponding systematic error control level. A common approach to correct for shear biases involves calibrating shape measurement methods using image simulations with known input shear. Given their high resolution, Hubble Space Telescope (HST) galaxies can, in principle, be utilised to emulate Euclid observations. In this work, we employ a GalSim-based testing environment to investigate whether uncertainties in the HST point spread function (PSF) model or in data processing techniques introduce significant biases in weak-lensing (WL) shear calibration. We used single Sérsic galaxy models to simulate both HST and Euclid observations. We then `Euclidised' our HST simulations and compared the results with the directly simulated Euclid-like images. For this comparison, we utilised a moment-based shape measurement algorithm and galaxy model fits. Through the Euclidisation procedure, we effectively reduced the residual multiplicative biases in shear measurements to sub-percent levels. This achievement was made possible by employing either the native pixel scales of the instruments, utilising the Lanczos15 interpolation kernel, correcting for noise correlations, and ensuring consistent galaxy signal-to-noise ratios between simulation branches. However, the Euclidisation procedure requires further analysis on the impact of the correlated noise, to estimate calibration bias. Additionally, we conducted an in-depth analysis of the accuracy of TinyTim HST PSF models using star fields observed in the F606W and F814W filters. We observe that F606W images exhibit a broader scatter in the recovered best-fit focus, compared to those in the F814W filter.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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