The Accuracy of Weak Lensing Simulations - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Article Dans Une Revue Monthly Notices of the Royal Astronomical Society Année : 2020

The Accuracy of Weak Lensing Simulations

Stefan Hilbert
  • Fonction : Auteur
Alexandre Barreira
  • Fonction : Auteur
Pablo Fosalba
  • Fonction : Auteur
Carlo Giocoli
Sownak Bose
Matteo Calabrese
  • Fonction : Auteur
Carmelita Carbone
  • Fonction : Auteur
Christopher T. Davies
  • Fonction : Auteur
Baojiu Li
  • Fonction : Auteur
Claudio Llinares
  • Fonction : Auteur
Pierluigi Monaco
  • Fonction : Auteur

Résumé

We investigate the accuracy of weak lensing simulations by comparing the results of five independently developed lensing simulation codes run on the same input N-body simulation. Our comparison focuses on the lensing convergence maps produced by the codes, and in particular on the corresponding PDFs, power spectra, and peak counts. We find that the convergence power spectra of the lensing codes agree to |$\lesssim 2{{\ \rm per\ cent}}$| out to scales ℓ ≈ 4000. For lensing peak counts, the agreement is better than |$5{{\ \rm per\ cent}}$| for peaks with signal-to-noise ≲ 6. We also discuss the systematic errors due to the Born approximation, line-of-sight discretization, particle noise, and smoothing. The lensing codes tested deal in markedly different ways with these effects, but they none-the-less display a satisfactory level of agreement. Our results thus suggest that systematic errors due to the operation of existing lensing codes should be small. Moreover their impact on the convergence power spectra for a lensing simulation can be predicted given its numerical details, which may then serve as a validation test.

Dates et versions

hal-02418295 , version 1 (18-12-2019)

Identifiants

Citer

Stefan Hilbert, Alexandre Barreira, Giulio Fabbian, Pablo Fosalba, Carlo Giocoli, et al.. The Accuracy of Weak Lensing Simulations. Monthly Notices of the Royal Astronomical Society, 2020, 493 (1), pp.305-319. ⟨10.1093/mnras/staa281⟩. ⟨hal-02418295⟩
176 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More