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Weak lensing tomography with orthogonal polynomials

Schäfer, Björn Malte ; Heisenberg, Lavinia

In: Monthly Notices of the Royal Astronomical Society, 2012, vol. 423, no. 4, p. 3445-3457

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    Titre
    • Weak lensing tomography with orthogonal polynomials
    Auteur
    • Schäfer, Björn Malte. Astronomisches Recheninstitut, Zentrum für Astronomie, Universität Heidelberg, Mönchhofstraße 12, 69120 Heidelberg, Germany
    • Heisenberg, Lavinia. Centre for Astroparticle Physics, Département de Physique Théorique, Université de Genève, 24 quai Ernest Ansermet, 1211 Genève, Switzerland
    Type de document
    • Postprint
    Langue
    • Inglese
    Publié dans
    • Monthly Notices of the Royal Astronomical Society, 2012, vol. 423, no. 4, p. 3445-3457. Blackwell Publishing Ltd
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:295485
    Summary
    The topic of this paper is weak cosmic shear tomography where the line-of-sight weighting is carried out with a set of specifically constructed orthogonal polynomials, dubbed Tomography with Orthogonal Radial Distance Polynomial Systems (TaRDiS). We investigate the properties of these polynomials and employ weak convergence spectra, which have been obtained by weighting with these polynomials, for the estimation of cosmological parameters. We quantify their power in constraining parameters in a Fisher matrix technique and demonstrate how each polynomial projects out statistically independent information, and how the combination of multiple polynomials lifts degeneracies. The assumption of a reference cosmology is needed for the construction of the polynomials, and as a last point we investigate how errors in the construction with a wrong cosmological model propagate to misestimates in cosmological parameters. TaRDiS performs on a similar level as traditional tomographic methods and some key features of tomography are made easier to understand