Cosmological constraints from the convergence 1point probability distribution
Abstract
We examine the cosmological information available from the 1point probability density function (PDF) of the weaklensing convergence field, utilizing fast LPICOLA simulations and a Fisher analysis. We find competitive constraints in the Ω_{m}σ_{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 2point 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 23, 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:

Monthly Notices of the Royal Astronomical Society
 Pub Date:
 November 2017
 DOI:
 10.1093/mnras/stx1626
 arXiv:
 arXiv:1611.01486
 Bibcode:
 2017MNRAS.472..439P
 Keywords:

 gravitational lensing: weak;
 cosmological parameters;
 largescale structure of Universe;
 cosmology: observations;
 Astrophysics  Cosmology and Nongalactic Astrophysics
 EPrint:
 10 pages, 5 figures