Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-03-31
Mon.Not.Roy.Astron.Soc.338:846-856,2003
Astronomy and Astrophysics
Astrophysics
12 pages, including 5 figures, uses mn.sty. Substantially revised version accepted by MNRAS
Scientific paper
10.1046/j.1365-8711.2003.06136.x
In the very near future, weak lensing surveys will map the projected density of the universe in an unbiased way over large regions of the sky. In order to interpret the results of studies it is helpful to develop an understanding of the errors associated with quantities extracted from the observations. In a generalization of one of our earlier works, we present estimators of the cumulants and cumulant correlators of the weak lensing convergence field, and compute the variance associated with these estimators. By restricting ourselves to so-called compensated filters we are able to derive quite simple expressions for the errors on these estimates. We also separate contributions from cosmic variance, shot noise and intrinsic ellipticity of the source galaxies.
Coles Peter
Munshi Dipak
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