暗能量巡天第六年结果：点扩散函数建模
宇宙学与河外天体物理
2025-03-20 v3 天体物理仪器与方法
摘要
我们介绍了利用暗能量巡天(DES Y6)完整六年数据进行弱引力透镜剪切测量的点扩散函数(PSF)建模。我们回顾了使用PIFF（全视场PSF）软件包的PSF估计流程，并描述了自DES第三年(Y3)分析以来PIFF和建模诊断的关键改进：(i) 使用外部Gaia和红外测光星表以确保用于模型拟合的恒星样本具有更高纯度；(ii) 增加了颜色依赖的PSF建模，这是任何弱引力透镜分析中的首次；(iii) 包含检查四阶矩的模型诊断，四阶矩对弱引力透镜测量的偏差程度与二阶建模误差相当。通过一套全面的诊断测试，我们展示了Y6模型精度的提高，这体现在系统误差显著小于Y3分析，Y3分析中由于PSF模型精度不足而排除了所有波段数据。对于Y6弱引力透镜分析，除了波段外，我们还包含了波段测光数据，为测光红移估计提供了第四个波段。展望下一代广域巡天，我们描述了PIFF的几项持续改进，PIFF将成为Vera C. Rubin天文台时空遗产巡天弱引力透镜分析的默认PSF建模软件。
引用
@article{arxiv.2501.05781,
title = {Dark Energy Survey Year 6 Results: Point-spread Function Modeling},
author = {T. Schutt and M. Jarvis and A. Roodman and A. Amon and M. R. Becker and R. A. Gruendl and M. Yamamoto and K. Bechtol and G. M. Bernstein and M. Gatti and E. S. Rykoff and E. Sheldon and M. A. Troxel and T. M. C. Abbott and M. Aguena and A. Alarcon and F. Andrade-Oliveira and D. Brooks and A. Carnero Rosell and J. Carretero and C. Chang and A. Choi and M. Crocce and L. N. da Costa and T. M. Davis and J. De Vicente and S. Desai and H. T. Diehl and S. Dodelson and P. Doel and C. Doux and A. Drlica-Wagner and A. Ferté and J. Frieman and J. García-Bellido and E. Gaztanaga and G. Giannini and D. Gruen and G. Gutierrez and W. G. Hartley and K. Herner and S. R. Hinton and D. L. Hollowood and K. Honscheid and D. Huterer and E. Krause and K. Kuehn and O. Lahav and S. Lee and M. Lima and J. L. Marshall and J. Mena-Fernández and R. Miquel and J. J. Mohr and J. Muir and J. Myles and R. L. C. Ogando and A. Pieres and A. A. Plazas Malagón and A. Porredon and M. Raveri and M. Rodriguez-Monroy and S. Samuroff and E. Sanchez and D. Sanchez Cid and I. Sevilla-Noarbe and M. Smith and E. Suchyta and G. Tarle and V. Vikram and A. R. Walker and N. Weaverdyck and Y. Zhang},
journal= {arXiv preprint arXiv:2501.05781},
year = {2025}
}
备注
33 pages, 24 figures, accepted to OJA