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  Euclid: The reduced shear approximation and magnification bias for Stage IV cosmic shear experiments

Deshpande, A. C., Kitching, T. D., Cardone, V. F., Taylor, P. L., Casas, S., Camera, S., et al. (2020). Euclid: The reduced shear approximation and magnification bias for Stage IV cosmic shear experiments. Astronomy and Astrophysics, 636: A95. doi:10.1051/0004-6361/201937323.

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Deshpande, A. C., Author
Kitching, T. D., Author
Cardone, V. F., Author
Taylor, P. L., Author
Casas, S., Author
Camera, S., Author
Carbone, C., Author
Kilbinger, M., Author
Pettorino, V., Author
Sakr, Z., Author
Sapone, D., Author
Tutusaus, I., Author
Auricchio, N., Author
Bodendorf, C.1, Author              
Bonino, D., Author
Brescia, M., Author
Capobianco, V., Author
Carretero, J., Author
Castellano, M., Author
Cavuoti, S., Author
Cledassou, R., AuthorCongedo, G., AuthorConversi, L., AuthorCorcione, L., AuthorCropper, M., AuthorDubath, F., AuthorDusini, S., AuthorFabbian, G., AuthorFranceschi, E., AuthorFumana, M., AuthorGarilli, B., AuthorGrupp, F.1, Author              Hoekstra, H., AuthorHormuth, F., AuthorIsrael, H., AuthorJahnke, K., AuthorKermiche, S., AuthorKubik, B., AuthorKunz, M., AuthorLacasa, F., AuthorLigori, S., AuthorLilje, P. B., AuthorLloro, I., AuthorMaiorano, E., AuthorMarggraf, O., AuthorMassey, R., AuthorMei, S., AuthorMeneghetti, M., AuthorMeylan, G., AuthorMoscardini, L., AuthorPadilla, C., AuthorPaltani, S., AuthorPasian, F., AuthorPires, S., AuthorPolenta, G., AuthorPoncet, M., AuthorRaison, F.1, Author              Rhodes, J., AuthorRoncarelli, M., AuthorSaglia, R.1, Author              Schneider, P., AuthorSecroun, A., AuthorSerrano, S., AuthorSirri, G., AuthorStarck, J. L., AuthorSureau, F., AuthorTaylor, A. N., AuthorTereno, I., AuthorToledo-Moreo, R., AuthorValenziano, L., AuthorWang, Y., AuthorZoubian, J., Author more..
1Optical and Interpretative Astronomy, MPI for Extraterrestrial Physics, Max Planck Society, ou_159895              


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 Abstract: Context. Stage IV weak lensing experiments will offer more than an order of magnitude leap in precision. We must therefore ensure that our analyses remain accurate in this new era. Accordingly, previously ignored systematic effects must be addressed. Aims. In this work, we evaluate the impact of the reduced shear approximation and magnification bias on information obtained from the angular power spectrum. To first-order, the statistics of reduced shear, a combination of shear and convergence, are taken to be equal to those of shear. However, this approximation can induce a bias in the cosmological parameters that can no longer be neglected. A separate bias arises from the statistics of shear being altered by the preferential selection of galaxies and the dilution of their surface densities in high-magnification regions. Methods. The corrections for these systematic effects take similar forms, allowing them to be treated together. We calculated the impact of neglecting these effects on the cosmological parameters that would be determined from Euclid, using cosmic shear tomography. To do so, we employed the Fisher matrix formalism, and included the impact of the super-sample covariance. We also demonstrate how the reduced shear correction can be calculated using a lognormal field forward modelling approach. Results. These effects cause significant biases in Ωm, σ8, ns, ΩDE, w0, and wa of −0.53σ, 0.43σ, −0.34σ, 1.36σ, −0.68σ, and 1.21σ, respectively. We then show that these lensing biases interact with another systematic effect: the intrinsic alignment of galaxies. Accordingly, we have developed the formalism for an intrinsic alignment-enhanced lensing bias correction. Applying this to Euclid, we find that the additional terms introduced by this correction are sub-dominant.


Language(s): eng - English
 Dates: 2020-04-27
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1051/0004-6361/201937323
Other: LOCALID: 3239381
 Degree: -



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Title: Astronomy and Astrophysics
  Other : Astron. Astrophys.
Source Genre: Journal
Publ. Info: France : EDP Sciences S A
Pages: - Volume / Issue: 636 Sequence Number: A95 Start / End Page: - Identifier: ISSN: 1432-0746
CoNE: https://pure.mpg.de/cone/journals/resource/954922828219_1