Error Estimates on Measurements of Cosmic Shear

Munshi, Dipak and Coles, Peter ORCID: https://orcid.org/0000-0002-5535-2850 2003. Error Estimates on Measurements of Cosmic Shear. Monthly Notices of the Royal Astronomical Society 338 , pp. 846-856. 10.1046/j.1365-8711.2003.06136.x

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Abstract

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 the cosmic variance, shot noise and intrinsic ellipticity of the source galaxies.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Subjects:	Q Science > QB Astronomy Q Science > QC Physics
Uncontrolled Keywords:	methods: analytical; methods: statistical; cosmology: theory; large-scale structure of Universe
ISSN:	0035-8711
Last Modified:	17 Oct 2022 08:58
URI:	https://orca.cardiff.ac.uk/id/eprint/1663

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