E- and B-mode mixing from incomplete knowledge of the shear correlation

Details E- and B-mode mixing from incomplete knowledge of the shear correlation E- and B-mode mixing from incomplete knowledge of the shear correlation

2006-04-25

arxiv.org/abs/astro-ph/0604520v2

Astron.Astrophys. 457 (2006) 19

Astronomy and Astrophysics

Astrophysics

Research Note, A&A in press. 6 pages, 6 figures

Scientific paper

10.1051/0004-6361:20065495

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 xi_{E, B +/-} 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 xi_{E, B +} and xi_{E, B -}, a field as large as 7 (2.4) degrees is necessary for ground-based (space-based) observations.

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