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Article Dans Une Revue Monthly Notices of the Royal Astronomical Society Année : 2020

Weak Lensing Skew-Spectrum

D. Munshi
  • Fonction : Auteur
T. Namikawa
  • Fonction : Auteur
T.D. Kitching
  • Fonction : Auteur
J.D. Mcewen
  • Fonction : Auteur

Résumé

We introduce the skew-spectrum statistic for weak lensing convergence κ maps and test it against state-of-the-art high-resolution all-sky numerical simulations. We perform the analysis as a function of source redshift and smoothing angular scale for individual tomographic bins. We also analyse the cross-correlation between different tomographic bins. We compare the numerical results to fitting-functions used to model the bispectrum of the underlying density field as a function of redshift and scale. We derive a closed form expression for the skew-spectrum for gravity-induced secondary non-Gaussianity. We also compute the skew-spectrum for the projected κ inferred from cosmic microwave background (CMB) studies. As opposed to the low redshift case, we find the post-Born corrections to be important in the modelling of the skew-spectrum for such studies. We show how the presence of a mask and noise can be incorporated in the estimation of a skew-spectrum.

Dates et versions

hal-02899245 , version 1 (15-07-2020)

Identifiants

Citer

D. Munshi, T. Namikawa, T.D. Kitching, J.D. Mcewen, F.R. Bouchet. Weak Lensing Skew-Spectrum. Monthly Notices of the Royal Astronomical Society, 2020, 498 (4), pp.6057-6068. ⟨10.1093/mnras/staa2769⟩. ⟨hal-02899245⟩
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