光滑截断的暗物质晕强透镜中薄透镜近似的精确度
Accuracy of the thin-lens approximation in strong lensing by smoothly truncated dark matter haloes
摘要：
本文研究了利用薄透镜近似的引力透镜效应估算质量的精度，该近似应用于Baltz、Marshall和Oguri最近提出的具有软截断机制的Navarro-Frenk-White质量模型。引力透镜的情况下考虑的是从爱因斯坦环（强透镜）的观察透镜质量的推断。结果表明，薄透镜简化假设引起的质量误差小于0.5%。作为副产品，软截断机制的最佳潮汐半径被发现是至多10倍的质量模型的维里半径。
英文摘要：
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%. 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.
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