| Issue |
A&A
Volume 457, Number 1, October I 2006
|
|
|---|---|---|
| Page(s) | 15 - 19 | |
| Section | Cosmology (including clusters of galaxies) | |
| DOI | https://doi.org/10.1051/0004-6361:20065495 | |
| Published online | 12 September 2006 | |
E- and B-mode mixing from incomplete knowledge of the shear correlation
Argelander-Institut für Astronomie, Universität Bonn, Auf dem Hügel 71, 53121 Bonn, Germany e-mail: kilbinge@astro.uni-bonn.de
Received:
25
April
2005
Accepted:
20
June
2006
Context.
Aims. We quantify the mixing of the measured cosmic-shear E- and B-modes caused by the lack of shear-correlation measurements on small and large scales, arising from a lack of close projected galaxy pairs and the finite field size, respectively.
Methods.
We calculate the aperture-mass statistics 
and the E-/B-mode shear-correlation functions
where small- and large-scale cutoffs are taken into
account. We assess the deviation of the obtained E-mode to the true
E-mode and the introduction of a spurious B-mode.
Results.
The measured aperture-mass dispersion is underestimated by more than 10%
on scales smaller than 12 times the lower cutoff.
For a precise measurement of the E- and B-modes at the percent level
using a combination of 
and 
, a
field as large as 7 (2.4) degrees is necessary for ground-based
(space-based) observations.
Key words: gravitational lensing / large-scale structure of Universe / cosmological parameters
© ESO, 2006
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