黑暗能源调查3年结果：点扩展功能建模

论文标题

黑暗能源调查3年结果：点扩展功能建模

Dark Energy Survey Year 3 Results: Point-Spread Function Modeling

论文作者

Jarvis, M., Bernstein, G. M., Amon, A., Davis, C., Léget, P. F., Bechtol, K., Harrison, I., Gatti, M., Roodman, A., Chang, C., Chen, R., Choi, A., Desai, S., Drlica-Wagner, A., Gruen, D., Gruendl, R. A., Hernandez, A., MacCrann, N., Meyers, J., Navarro-Alsina, A., Pandey, S., Plazas, A. A., Secco, L. F., Sheldon, E., Troxel, M. A., Vorperian, S., Wei, K., Zuntz, J., Abbott, T. M. C., Aguena, M., Allam, S., Avila, S., Bhargava, S., Bridle, S. L., Brooks, D., Rosell, A. Carnero, Kind, M. Carrasco, Carretero, J., Costanzi, M., da Costa, L. N., De Vicente, J., Diehl, H. T., Doel, P., Everett, S., Flaugher, B., Fosalba, P., Frieman, J., García-Bellido, J., Gaztanaga, E., Gerdes, D. W., Gutierrez, G., Hinton, S. R., Hollowood, D. L., Honscheid, K., James, D. J., Kent, S., Kuehn, K., Kuropatkin, N., Lahav, O., Maia, M. A. G., March, M., Marshall, J. L., Melchior, P., Menanteau, F., Miquel, R., Ogando, R. L. C., Paz-Chinchón, F., Rykoff, E. S., Sanchez, E., Scarpine, V., Schubnell, M., Serrano, S., Sevilla-Noarbe, I., Smith, M., Suchyta, E., Swanson, M. E. C., Tarle, G., Varga, T. N., Walker, A. R., Wester, W., Wilkinson, R. D., Collaboration, DES

论文摘要

我们引入了一个新的软件包，用于对天文图像的点传播功能（PSF）进行建模，称为PIFF（完整FOV中的PSF），我们将其应用于Dark Energy Survey（DES）数据的头三年（称为Y3）。我们描述了有关PIFF用于建模PSF的算法的相关细节，包括PSF模型在视野（FOV）中的变化。诊断结果表明，PSF建模的系统误差在尺度范围内非常小，这对于DES Y3弱透镜分析很重要。特别是，来自PSF建模的系统误差明显小于DES（Y1）分析的相应结果。我们还简要描述了对PIFF的一些计划改进，我们希望在未来的分析中进一步减少建模错误。

We introduce a new software package for modeling the point-spread function (PSF) of astronomical images, called Piff (PSFs In the Full FOV), which we apply to the first three years (known as Y3) of the Dark Energy Survey (DES) data. We describe the relevant details about the algorithms used by Piff to model the PSF, including how the PSF model varies across the field of view (FOV). Diagnostic results show that the systematic errors from the PSF modeling are very small over the range of scales that are important for the DES Y3 weak lensing analysis. In particular, the systematic errors from the PSF modeling are significantly smaller than the corresponding results from the DES year one (Y1) analysis. We also briefly describe some planned improvements to Piff that we expect to further reduce the modeling errors in future analyses.

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