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

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Monthly Notices of the Royal Astronomical Society

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Frittelli, S.; Kling, Thomas
galaxies; gravitation; gravitational lensing; Physics
article description
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.