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26 April 2024 |
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A Numerical Study of Cosmic Shear Statistics | | A. Thion
; Y. Mellier
; F. Bernardeau
; E. Bertin
; T. Erben
; L. van Waerbeke
; | | Date: |
11 Aug 2000 | | Subject: | astro-ph | | Affiliation: | 1,2), F. Bernardeau , E. Bertin (1,2), T. Erben , L. van Waerbeke ( IAP, Obs. Paris DEMIRM, SPhT CE Saclay, MPA Garching, CITA | | Abstract: | We explore the stability of the variance and skewness of the cosmic gravitational convergence field, using two different approaches: first we simulate a whole MEGACAM survey (100 sq. degrees). The reconstructed mass map, obtained from a shear map, shows that the state-of-the-art data analysis methods can measure weak-lensing statistics at angular scales ranging from 2.5’ to 25’. We looked also at the influence of a varying signal-to-noise ratio over the shear map (due to local variations of source density) on the mass reconstruction, by means of Monte-Carlo simulation. The effect at small scales can easily be corrected-for in most of the relevant cases. These results enhance the confidence in the capability of future large surveys to measure accurately cosmologically interesting quantities. | | Source: | arXiv, astro-ph/0008180 | | Services: | Forum | Review | PDF | Favorites | |
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