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Enhancing the cosmic shear power spectrum

Simpson, F, Harnois-Déraps, J, Heymans, C, Jimenez, R, Joachimi, B and Verde, L (2015) Enhancing the cosmic shear power spectrum. Monthly Notices of the Royal Astronomical Society, 456 (1). pp. 278-285. ISSN 0035-8711

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Abstract

Applying a transformation to a non-Gaussian field can enhance the information content of the resulting power spectrum, by reducing the correlations between Fourier modes. In the context of weak gravitational lensing, it has been shown that this gain in information content is significantly compromised by the presence of shape noise. We apply clipping to mock convergence fields, a technique which is known to be robust in the presence of noise and has been successfully applied to galaxy number density fields. When analysed in isolation the resulting convergence power spectrum returns degraded constraints on cosmological parameters. However, substantial gains can be achieved by performing a combined analysis of the power spectra derived from both the original and transformed fields. Even in the presence of realistic levels of shape noise, we demonstrate that this approach is capable of reducing the area of likelihood contours within the Ωm − σ8 plane by more than a factor of 3.

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords: 0201 Astronomical and Space Sciences
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press (OUP)
Date Deposited: 24 Jul 2020 10:11
Last Modified: 24 Jul 2020 10:15
DOI or Identification number: 10.1093/mnras/stv2474
URI: https://researchonline.ljmu.ac.uk/id/eprint/13363

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