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MARS: A New Maximum Entropy-Regularized Strong Lensing Mass Reconstruction Method

Presentation #139.08 in the session Galaxy Clusters/Large Scale Structure, Cosmic Distance — iPoster Session.

Published onJun 29, 2022
MARS: A New Maximum Entropy-Regularized Strong Lensing Mass Reconstruction Method

Free-form strong-lensing (SL) mass reconstructions typically suffer from overfitting, which manifest itself as artificial small-scale fluctuations. We present a new free-form MAximum entropy ReconStruction (MARS) method. The MARS algorithm enables us to achieve excellent convergence in source positions (~0.001 arcsec) while minimizing spurious small-scale fluctuations from overfitting. After verifying the performance of our algorithm using the publicly available synthetic SL data, we apply MARS to A1689, which has been a subject of many SL studies. The resulting mass profile of A1689 is well-described by a Navarro-Frank-White (NFW) profile at r<200 kpc and we find no evidence that A1689 is over-concentrated.

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