Euclid preparation : VI. Verifying the performance of cosmic shear experiments

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http://hdl.handle.net/10138/320841

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Euclid Collaboration , Paykari , P , Keihänen , E , Kurki-Suonio , H & Kirkpatrick , C C 2020 , ' Euclid preparation : VI. Verifying the performance of cosmic shear experiments ' , Astronomy & Astrophysics , vol. 635 , A139 . https://doi.org/10.1051/0004-6361/201936980

Title: Euclid preparation : VI. Verifying the performance of cosmic shear experiments
Author: Euclid Collaboration; Paykari, P.; Keihänen, E.; Kurki-Suonio, H.; Kirkpatrick, C. C.
Contributor: University of Helsinki, Particle Physics and Astrophysics
University of Helsinki, Department of Physics
University of Helsinki, Particle Physics and Astrophysics
Date: 2020-03-23
Language: eng
Number of pages: 18
Belongs to series: Astronomy & Astrophysics
ISSN: 0004-6361
URI: http://hdl.handle.net/10138/320841
Abstract: Aims. Our aim is to quantify the impact of systematic effects on the inference of cosmological parameters from cosmic shear.Methods. We present an "end-to-end" approach that introduces sources of bias in a modelled weak lensing survey on a galaxy-by-galaxy level. We propagated residual biases through a pipeline from galaxy properties at one end to cosmic shear power spectra and cosmological parameter estimates at the other end. We did this to quantify how imperfect knowledge of the pipeline changes the maximum likelihood values of dark energy parameters.Results. We quantify the impact of an imperfect correction for charge transfer inefficiency and modelling uncertainties of the point spread function for Euclid, and find that the biases introduced can be corrected to acceptable levels.
Subject: gravitational lensing: weak
CHALLENGE LIGHTCONE SIMULATION
CHARGE-TRANSFER INEFFICIENCY
DARK ENERGY
REQUIREMENTS
CALIBRATION
SENSITIVITY
BIAS
115 Astronomy, Space science
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