Cosmological Constraints From Weak Lensing Peak Statistics With CFHT Stripe 82 Survey

Xiangkun Liu; Chuzhong Pan; Ran Li; Huanyuan Shan; Qiao Wang; Liping Fu; Zuhui Fan; Jean-Paul Kneib; Alexie Leauthaud; Ludovic Van Waerbeke; Martin Makler; Bruno Moraes; Thomas Erben; Aldée Charbonnier

doi:10.1093/mnras/stv784

paper

Cosmological Constraints From Weak Lensing Peak Statistics With CFHT Stripe 82 Survey

arXiv:1412.3683 · doi:10.1093/mnras/stv784

Abstract

We derived constraints on cosmological parameters using weak lensing peak statistics measured on the $\sim 130 deg^{2}$ of the Canada-France-Hawaii Telescope Stripe 82 Survey (CS82). This analysis demonstrates the feasibility of using peak statistics in cosmological studies. For our measurements, we considered peaks with signal-to-noise ratio in the range of $ν = [3, 6]$ . For a flat $Λ$ CDM model with only $(Ω_{m}, σ_{8})$ as free parameters, we constrained the parameters of the following relation $Σ_{8} = σ_{8} (Ω_{m} /0.27)^{α}$ to be: $Σ_{8} = 0.82 \pm 0.03$ and $α = 0.43 \pm 0.02$ . The $α$ value found is considerably smaller than the one measured in two-point and three-point cosmic shear correlation analyses, showing a significant complement of peak statistics to standard weak lensing cosmological studies. The derived constraints on $(Ω_{m}, σ_{8})$ are fully consistent with the ones from either WMAP9 or Planck. From the weak lensing peak abundances alone, we obtained marginalised mean values of $Ω_{m} = 0.3 8_{- 0.24}^{+ 0.27}$ and $σ_{8} = 0.81 \pm 0.26$ . Finally, we also explored the potential of using weak lensing peak statistics to constrain the mass-concentration relation of dark matter halos simultaneously with cosmological parameters.

17 pages, 11 figures, MNRAS in press

Cosmological Constraints From Weak Lensing Peak Statistics With CFHT Stripe 82 Survey

Abstract

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