Details

Autor(en) / Beteiligte

• Patton, Kenneth
• Blazek, Jonathan
• Honscheid, Klaus
• Huff, Eric
• Melchior, Peter
• Ross, Ashley J
• Suchyta, Eric

Titel

Cosmological constraints from the convergence 1-point probability distribution

Ist Teil von

• Monthly notices of the Royal Astronomical Society, 2017-11, Vol.472 (1), p.439-446

Ort / Verlag

United States: Oxford University Press

Erscheinungsjahr

2017

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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 Ω m –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.