TY - JOUR
T1 - Cosmological constraints from the convergence 1-point probability distribution
AU - Patton, Kenneth
AU - Blazek, Jonathan
AU - Honscheid, Klaus
AU - Huff, Eric
AU - Melchior, Peter
AU - Ross, Ashley J.
AU - Suchyta, Eric
N1 - Funding Information:
The work on this paper was supported by Department of Energy grant DE-SC0011726.
Publisher Copyright:
© 2018 The Author(s).
PY - 2017/11
Y1 - 2017/11
N2 - 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 Ωm-σ8 plane from the convergence PDF with 188 arcmin2 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.
AB - 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 Ωm-σ8 plane from the convergence PDF with 188 arcmin2 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.
KW - Cosmological parameters
KW - Cosmology: observations
KW - Gravitational lensing: weak
KW - Large-scale structure of Universe
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U2 - 10.1093/mnras/stx1626
DO - 10.1093/mnras/stx1626
M3 - Article
AN - SCOPUS:85042423589
SN - 0035-8711
VL - 472
SP - 439
EP - 446
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 1
ER -