Revised Lens Model for the Multiply-Imaged Lensed Supernova, "SN Refsdal", in MACS J1149+2223

TL;DR

This paper presents a revised gravitational lens model for MACS J1149+2223, improving the accuracy of supernova image positions, magnifications, and time delay predictions by incorporating additional constraints and model flexibility.

Contribution

The study introduces a refined lens model that better reproduces observed lensing signals and predicts supernova properties with increased precision.

Findings

Accurately reconstructed supernova positions and magnifications

Predicted time delays between supernova images

Reconstructed the host galaxy's source image

Abstract

We present a revised lens model of MACS J1149+2223, in which the first resolved multiply-imaged lensed supernova was discovered. The lens model is based on the model of Johnson et al. (2014) with some modifications. We include more lensing constraints from the host galaxy of the newly discovered supernova, and increase the flexibility of the model in order to better reproduce the lensing signal in the vicinity of this galaxy. The revised model accurately reconstructs the positions of the lensed supernova, provides magnifications, and predicts the time delay between the instances of the supernova. Finally, we reconstruct the source image of the host galaxy, and position the supernova on one of its spiral arms. Products of this lens model are available to the community through MAST.