Journal Article

Accuracy of the thin-lens approximation in strong lensing by smoothly truncated dark matter haloes

Simonetta Frittelli and Thomas P. Kling

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 415, issue 4, pages 3599-3608
Published in print August 2011 | ISSN: 0035-8711
Published online August 2011 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2011.18974.x
Accuracy of the thin-lens approximation in strong lensing by smoothly truncated dark matter haloes

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The accuracy of mass estimates by gravitational lensing using the thin-lens approximation applied to Navarro–Frenk–White mass models with a soft truncation mechanism recently proposed by Baltz, Marshall and Oguri is studied. The gravitational lens scenario considered is the case of the inference of lens mass from the observation of Einstein rings (strong lensing). It is found that the mass error incurred by the simplifying assumption of thin lenses is below 0.5 per cent. As a byproduct, the optimal tidal radius of the soft truncation mechanism is found to be at most 10 times the virial radius of the mass model.

Keywords: gravitation; gravitational lensing: strong; galaxies: clusters: general

Journal Article.  5961 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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