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Title: Enhancing the cosmic shear power spectrum
Author: Simpson, Fergus
Harnois-Deraps, Joachim
Heymans, Catherine
Jiménez, Raúl (Jiménez Tellado)
Joachimi, Benjamin
Verde, Licia
Keywords: Cosmologia
Constants físiques
Spectrum analysis
Physical constants
Issue Date: 11-Feb-2016
Publisher: Royal Astronomical Society
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 Omega(m) - sigma(8) plane by more than a factor of 3.
Note: Versió postprint del document publicat a:
It is part of: Monthly Notices of the Royal Astronomical Society, 2016, vol. 456, num. 1, p. 278-285
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ISSN: 0035-8711
Appears in Collections:Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB))

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