Journal Article

Measurement of halo properties with weak lensing shear and flexion

Xinzhong Er, Ismael Tereno and Shude Mao

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 421, issue 2, pages 1443-1449
Published in print April 2012 | ISSN: 0035-8711
Published online March 2012 | e-ISSN: 1365-2966 | DOI:
Measurement of halo properties with weak lensing shear and flexion

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We constrain the properties of cluster haloes by performing likelihood analysis using lensing shear and flexion data. We test our analysis using two mock cluster haloes: an isothermal ellipsoid (SIE) model and a more realistic elliptical Navarro–Frenk–White model. For both haloes, we find that flexion is more sensitive to the halo ellipticity than shear. The introduction of flexion information significantly improves the constraints on halo ellipticity, orientation and mass. We also point out that there is a degeneracy between the mass and the ellipticity of SIE models in the lensing signal.

Keywords: gravitational lensing: weak; galaxies: haloes

Journal Article.  4532 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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