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Weak lensing skew-spectrum

Munshi, D; Namikawa, T; Kitching, TD; McEwen, JD; Bouchet, FR; (2020) Weak lensing skew-spectrum. Monthly Notices of the Royal Astronomical Society , 498 (4) pp. 6057-6068. 10.1093/mnras/staa2769. Green open access

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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.

Type: Article
Title: Weak lensing skew-spectrum
Open access status: An open access version is available from UCL Discovery
DOI: 10.1093/mnras/staa2769
Publisher version: https://doi.org/10.1093/mnras/staa2769
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher's terms and conditions.
Keywords: Cosmology, Weak Lensing, Methods: analytical, statistical, numerical
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics
URI: https://discovery.ucl.ac.uk/id/eprint/10113450
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