Morphology of weak lensing convergence maps
| Autor: | Jason D. McEwen, Thomas D. Kitching, D. Munshi, F. R. Bouchet, Toshiya Namikawa |
|---|---|
| Přispěvatelé: | Institut d'Astrophysique de Paris (IAP), Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Cosmology and Nongalactic Astrophysics (astro-ph.CO)
Cosmic microwave background FOS: Physical sciences General Relativity and Quantum Cosmology (gr-qc) Astrophysics::Cosmology and Extragalactic Astrophysics 01 natural sciences General Relativity and Quantum Cosmology Spectral line methods: analytical numerical 0103 physical sciences Minkowski space Statistical physics 010303 astronomy & astrophysics Weak gravitational lensing Physics 010308 nuclear & particles physics Astronomy and Astrophysics Redshift Space and Planetary Science Harmonics weak lensing [PHYS.GRQC]Physics [physics]/General Relativity and Quantum Cosmology [gr-qc] [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] Bispectrum statistical cosmology Smoothing Astrophysics - Cosmology and Nongalactic Astrophysics |
| Zdroj: | Mon.Not.Roy.Astron.Soc. Mon.Not.Roy.Astron.Soc., 2021, 507 (1), pp.1421-1433. ⟨10.1093/mnras/stab2101⟩ |
| DOI: | 10.1093/mnras/stab2101⟩ |
| Popis: | We study the morphology of convergence maps by perturbatively reconstructing their Minkowski Functionals (MFs). We present a systematics study using a set of three generalised skew-spectra as a function of source redshift and smoothing angular scale. Using an approach based on pseudo-$S_{\ell}$s (PSL) we show how these spectra will allow reconstruction of MFs in the presence of an arbitrary mask and inhomogeneous noise in an unbiased way. Our theoretical predictions are based on a recently introduced fitting function to the bispectrum. We compare our results against state-of-the art numerical simulations and find an excellent agreement. The reconstruction can be carried out in a controlled manner as a function of angular harmonics $\ell$ and source redshift $z_s$ which allows for a greater handle on any possible sources of non-Gaussianity. Our method has the advantage of estimating the topology of convergence maps directly using shear data. We also study weak lensing convergence maps inferred from Cosmic Microwave Background (CMB) observations; and we find that, though less significant at low redshift, the post-Born corrections play an important role in any modelling of the non-Gaussianity of convergence maps at higher redshift. We also study the cross-correlations of estimates from different tomographic bins. 16 pages, 12 figures |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|