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  Euclid: Nonparametric point spread function field recovery through interpolation on a graph Laplacian

Schmitz, M. A., Starck, J.-L., Mboula, F. N., Auricchio, N., Brinchmann, J., Capobianco, R. I. V., et al. (2020). Euclid: Nonparametric point spread function field recovery through interpolation on a graph Laplacian. Astronomy and Astrophysics, 636: A78. doi:10.1051/0004-6361/201936094.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0006-A881-A Version Permalink: http://hdl.handle.net/21.11116/0000-0006-A882-9
Genre: Journal Article

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 Creators:
Schmitz, M. A., Author
Starck, J.-L., Author
Mboula, F. Ngole, Author
Auricchio, N., Author
Brinchmann, J., Author
Capobianco, R. I. Vito, Author
Clédassou, R., Author
Conversi, L., Author
Corcione, L., Author
Fourmanoit, N., Author
Frailis, M., Author
Garilli, B., Author
Hormuth, F., Author
Hu, D., Author
Israel, H., Author
Kermiche, S., Author
Kitching, T. D., Author
Kubik, B., Author
Kunz, M., Author
Ligori, S., Author
Lilje, P. B., AuthorLloro, I., AuthorMansutti, O., AuthorMarggraf, O., AuthorMassey, R. J., AuthorPasian, F., AuthorPettorino, V., AuthorRaison, F.1, Author              Rhodes, J. D., AuthorRoncarelli, M., AuthorSaglia, R. P.1, Author              Schneider, P., AuthorSerrano, S., AuthorTaylor, A. N., AuthorToledo-Moreo, R., AuthorValenziano, L., AuthorVuerli, C., AuthorZoubian, J., Author more..
Affiliations:
1Optical and Interpretative Astronomy, MPI for Extraterrestrial Physics, Max Planck Society, ou_159895              

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 Abstract: Context. Future weak lensing surveys, such as the Euclid mission, will attempt to measure the shapes of billions of galaxies in order to derive cosmological information. These surveys will attain very low levels of statistical error, and systematic errors must be extremely well controlled. In particular, the point spread function (PSF) must be estimated using stars in the field, and recovered with high accuracy. Aims. The aims of this paper are twofold. Firstly, we took steps toward a nonparametric method to address the issue of recovering the PSF field, namely that of finding the correct PSF at the position of any galaxy in the field, applicable to Euclid. Our approach relies solely on the data, as opposed to parametric methods that make use of our knowledge of the instrument. Secondly, we studied the impact of imperfect PSF models on the shape measurement of galaxies themselves, and whether common assumptions about this impact hold true in an Euclid scenario. Methods. We extended the recently proposed resolved components analysis approach, which performs super-resolution on a field of under-sampled observations of a spatially varying, image-valued function. We added a spatial interpolation component to the method, making it a true 2-dimensional PSF model. We compared our approach to PSFEx, then quantified the impact of PSF recovery errors on galaxy shape measurements through image simulations. Results. Our approach yields an improvement over PSFEx in terms of the PSF model and on observed galaxy shape errors, though it is at present far from reaching the required Euclid accuracy. We also find that the usual formalism used for the propagation of PSF model errors to weak lensing quantities no longer holds in the case of an Euclid-like PSF. In particular, different shape measurement approaches can react differently to the same PSF modeling errors.

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Language(s): eng - English
 Dates: 2020-04-21
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: DOI: 10.1051/0004-6361/201936094
Other: LOCALID: 3241475
 Degree: -

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Title: Astronomy and Astrophysics
  Other : Astron. Astrophys.
Source Genre: Journal
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Publ. Info: France : EDP Sciences S A
Pages: - Volume / Issue: 636 Sequence Number: A78 Start / End Page: - Identifier: ISSN: 1432-0746
CoNE: https://pure.mpg.de/cone/journals/resource/954922828219_1