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

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

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.
Original languageEnglish
Pages (from-to)1282-1299
Number of pages18
JournalMonthly Notices of the Royal Astronomical Society
Issue number1
Early online date26 Nov 2020
Publication statusPublished - 1 Feb 2021

Keywords / Materials (for Non-textual outputs)

  • astro-ph.IM
  • astro-ph.CO


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