The story of supernova 'Refsdal' told by MUSE
C. Grillo, W. Karman, S. H. Suyu, P. Rosati, I. Balestra, A. Mercurio,, M. Lombardi, T. Treu, G. B. Caminha, A. Halkola, S. A. Rodney, R. Gavazzi, K., I. Caputi

TL;DR
This paper reports detailed spectroscopic observations of the galaxy cluster MACS J1149.5+2223, enabling precise strong lensing models that predict the future appearance of supernova 'Refsdal' with high accuracy.
Contribution
The study provides the first extensive spectroscopic catalog and detailed lensing models of the cluster, improving predictions of supernova 'Refsdal's' future images and magnifications.
Findings
117 secure redshifts measured in 4.8 hours
6 detailed strong lensing models with 0.26" rms accuracy
Predicted supernova 'Refsdal' reappearance between March and June 2016
Abstract
We present MUSE observations in the core of the HFF galaxy cluster MACS J1149.5+2223, where the first magnified and spatially-resolved multiple images of SN 'Refsdal' at redshift 1.489 were detected. Thanks to a DDT program with the VLT and the extraordinary efficiency of MUSE, we measure 117 secure redshifts with just 4.8 hours of total integration time on a single target pointing. We spectroscopically confirm 68 galaxy cluster members, with redshift values ranging from 0.5272 to 0.5660, and 18 multiple images belonging to 7 background, lensed sources distributed in redshifts between 1.240 and 3.703. Starting from the combination of our catalog with those obtained from extensive spectroscopic and photometric campaigns using the HST, we select a sample of 300 (164 spectroscopic and 136 photometric) cluster members, within approximately 500 kpc from the BCG, and a set of 88 reliable…
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