通过优化 Dark Energy Survey Self-Organizing Map Photo-z 方法来增强弱引力红移分布表征
宇宙学与河外天体物理
2024-08-05 v1 天体物理仪器与方法
摘要
对红移分布进行表征是大尺度结构宇宙学研究的关键。在本工作中，我们专注于改进 Dark Energy Survey (DES) Self-Organizing Map (SOM) 方法，用于光谱红移估计 (SOMPZ)，具体是在期待 DES Year 6 (DES Y6) 数据时进行改进。该数据集具有比 DES Year 3 (DES Y3) 更深更暗的星系，要求调整技术以确保准确恢复底层红移分布。我们研究了三种增强现有 DES Y3 所用 SOM 方法的策略：1) 用专为红移估计挑战量身定制的算法取代 Y3 SOM 算法；2) 纳入 g 波段光通量信息以细化红移估计（即使用 griz 光通量而不仅仅使用 riz）；3) 为可获得的星系增补红移数据。将这些方法应用于 DES Y3 数据，并与 Y3 fiducial 方法进行比较。我们的分析表明，前两种策略均取得显著改进，显著减少了红移 bin 之间的重叠。通过组合策略 1 和 2，我们成功将 DES Y3 的红移 bin 重叠降低最高 66%。相反，第三种策略即为所选星系添加红移数据作为方法的额外特征，结果不佳，被放弃。我们的发现促进了弱引力红移表征的进展，为 DES Year 6 及未来阶段 IV 调查（如 Rubin Observatory）更好的红移表征奠定了基础。
引用
@article{arxiv.2408.00922,
title = {Enhancing weak lensing redshift distribution characterization by optimizing the Dark Energy Survey Self-Organizing Map Photo-z method},
author = {A. Campos and B. Yin and S. Dodelson and A. Amon and A. Alarcon and C. Sánchez and G. M. Bernstein and G. Giannini and J. Myles and S. Samuroff and O. Alves and F. Andrade-Oliveira and K. Bechtol and M. R. Becker and J. Blazek and H. Camacho and A. Carnero Rosell and M. Carrasco Kind and R. Cawthon and C. Chang and R. Chen and A. Choi and J. Cordero and C. Davis and J. DeRose and H. T. Diehl and C. Doux and A. Drlica-Wagner and K. Eckert and T. F. Eifler and J. Elvin-Poole and S. Everett and X. Fang and A. Ferté and O. Friedrich and M. Gatti and D. Gruen and R. A. Gruendl and I. Harrison and W. G. Hartley and K. Herner and H. Huang and E. M. Huff and M. Jarvis and E. Krause and N. Kuropatkin and P. -F. Leget and N. MacCrann and J. McCullough and A. Navarro-Alsina and S. Pandey and J. Prat and M. Raveri and R. P. Rollins and A. Roodman and R. Rosenfeld and A. J. Ross and E. S. Rykoff and J. Sanchez and L. F. Secco and I. Sevilla-Noarbe and E. Sheldon and T. Shin and M. A. Troxel and I. Tutusaus and T. N. Varga and R. H. Wechsler and B. Yanny and Y. Zhang and J. Zuntz and M. Aguena and J. Annis and D. Bacon and S. Bocquet and D. Brooks and D. L. Burke and J. Carretero and F. J. Castander and M. Costanzi and L. N. da Costa and J. De Vicente and P. Doel and I. Ferrero and B. Flaugher and J. Frieman and J. García-Bellido and E. Gaztanaga and G. Gutierrez and S. R. Hinton and D. L. Hollowood and K. Honscheid and D. J. James and K. Kuehn and M. Lima and H. Lin and J. L. Marshall and J. Mena-Fernández and F. Menanteau and R. Miquel and R. L. C. Ogando and M. Paterno and M. E. S. Pereira and A. Pieres and A. A. Plazas Malagón and A. Porredon and E. Sanchez and D. Sanchez Cid and M. Smith and E. Suchyta and M. E. C. Swanson and G. Tarle and C. To and V. Vikram and N. Weaverdyck},
journal= {arXiv preprint arXiv:2408.00922},
year = {2024}
}