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

M. Kilbinger, P. Schneider, T. Eifler

Research output: Contribution to journalArticle

38 Scopus citations

Abstract

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 〈M ap,perp;2) and the E-/B-mode shear-correlation functions ξE,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 ξE,B+ and ξE,B-, a field as large as 7 (2.4) degrees is necessary for ground-based (space-based) observations.

Original languageEnglish (US)
Pages (from-to)15-19
Number of pages5
JournalAstronomy and astrophysics
Volume457
Issue number1
DOIs
StatePublished - Oct 1 2006
Externally publishedYes

Keywords

  • Cosmological parameters
  • Gravitational lensing
  • Large-scale structure of Universe

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Fingerprint Dive into the research topics of 'E- And B-mode mixing from incomplete knowledge of the shear correlation'. Together they form a unique fingerprint.

  • Cite this