Revised Lens Model for the Multiply Imaged Lensed Supernova, “Sn Refsdal” in Macs J1149+2223

Abstract

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

Sn Refsdal: Photometry and Time Delay Measurements of the First Einstein Cross Supernova

“…Furthermore, all of the most up-to-date models Jauzac et al 2015;Kawamata et al 2015;Treu et al 2016) agree that the date of peak brightness for the reappearance of SN Refsdal in image SX should occur within 1-1.5 years. That prediction is also broadly in agreement with earlier models based on a more limited set of input data (Diego et al 2015;Kelly et al 2015c;Oguri 2015;Sharon & Johnson 2015). A transient source at the expected position of image SX has now been detected, with magnitudes that are consistent with the magnification ratios and time delays predicted by several of these models (Kelly et al 2015b).…”

“…Lens models consistently indicate that the second image of this galaxy, 1.2, is a trailing image (e.g., Kelly et al 2015c;Oguri 2015;Sharon & Johnson 2015;Treu et al 2016), and indeed a new transient source appeared at the expected location in 2015 December. This new source is consistent with being the predicted reappearance image, SX (Kelly et al 2015b).…”

“…Figure 7 presents a comparison of our measured magnification ratios and time delays for images S1-S4 against all published lens model predictions available as of 2015 December 15. The earliest models, first posted within a week of the SN Refsdal discovery, are shown as squares (Oguri 2015;Sharon & Johnson 2015). 30 The recently updated model of Jauzac et al (2016) is plotted with circles, and the set of models from the Treu et al (2016) model comparison program (Die-a, Gri-g, Ogu-a, Ogu-g, Sha-a, Sha-g, Zit-g, Zit-c) are plotted with trangles.…”

“…Since the discovery of SN Refsdal, many lens modeling teams have produced updated lens models and generated predictions for the SN time delays and magnifications, in some cases taking advantage of the very deep imaging and spectrosopic data from the HST and other observatories Grillo et al 2015;Jauzac et al 2016;Kawamata et al 2015;Oguri 2015;Sharon & Johnson 2015). Treu et al (2016) describes the collaborative development of some of these updated lens models by five independent teams, and highlights the rare opportunity for a true blind test of these models.…”

“Refsdal” Meets Popper: Comparing Predictions of the Re-Appearance of the Multiply Imaged Supernova Behind MACSJ1149.5+2223

“…All of the models that have been published after the discovery of SN Refsdal (Diego et al 2015;Jauzac et al 2015;Kelly et al 2015;Oguri 2015;Sharon & Johnson 2015) predict that an additional image will form some time in the near future (close to image 1.2 of the host galaxy, shown in Figure 1). It could appear as early as 2015 October or in a few years.…”