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Cosmological constraints from the convergence 1-point probability distribution

Author(s): Patton, Kenneth; Blazek, Jonathan; Honscheid, Klaus; Huff, Eric; Melchior, Peter M; et al

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Abstract: We examine the cosmological information available from the 1-point probability density function (PDF) of the weak-lensing convergence field, utilizing fast L-PICOLA simulations and a Fisher analysis. We find competitive constraints in the Omega(m)-sigma(8) plane from the convergence PDF with 188 arcmin(2) pixels compared to the cosmic shear power spectrum with an equivalent number of modes (l < 886). The convergence PDF also partially breaks the degeneracy cosmic shear exhibits in that parameter space. A joint analysis of the convergence PDF and shear 2-point function also reduces the impact of shape measurement systematics, to which the PDF is less susceptible, and improves the total figure of merit by a factor of 2-3, depending on the level of systematics. Finally, we present a correction factor necessary for calculating the unbiased Fisher information from finite differences using a limited number of cosmological simulations.
Publication Date: Nov-2017
Electronic Publication Date: 29-Jun-2017
Citation: Patton, Kenneth, Blazek, Jonathan, Honscheid, Klaus, Huff, Eric, Melchior, Peter, Ross, Ashley J, Suchyta, Eric. (2017). Cosmological constraints from the convergence 1-point probability distribution. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 472 (439 - 446. doi:10.1093/mnras/stx1626
DOI: doi:10.1093/mnras/stx1626
ISSN: 0035-8711
EISSN: 1365-2966
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Pages: 439 - 446
Type of Material: Journal Article
Version: Final published version. Article is made available in OAR by the publisher's permission or policy.

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