A Numerical Study of Cosmic Shear Statistics
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.
Keywords
Cite
@article{arxiv.astro-ph/0008180,
title = {A Numerical Study of Cosmic Shear Statistics},
author = {A. Thion and Y. Mellier and F. Bernardeau and E. Bertin and T. Erben and L. van Waerbeke},
journal= {arXiv preprint arXiv:astro-ph/0008180},
year = {2007}
}
Comments
Latex, 2 pages, moriond2000.sty and psfig.sty, gzipped tar file. To appear in the Proceedings of the XXth Moriond Astrophysics Meeting "Cosmological Physics with Gravitational Lensing", eds. J.-P. Kneib, Y. Mellier, M. Moniez and J. Tran Thanh Van