Please use this identifier to cite or link to this item:
http://hdl.handle.net/2445/110930
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 Espectroscòpia Constants físiques Cosmology 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: https://doi.org/10.1093/mnras/stv2474 |
It is part of: | Monthly Notices of the Royal Astronomical Society, 2016, vol. 456, num. 1, p. 278-285 |
URI: | http://hdl.handle.net/2445/110930 |
Related resource: | https://doi.org/10.1093/mnras/stv2474 |
ISSN: | 0035-8711 |
Appears in Collections: | Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB)) Publicacions de projectes de recerca finançats per la UE |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
669153.pdf | 178.02 kB | Adobe PDF | View/Open |
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.