Vol. 673
3. Cosmology (including clusters of galaxies)

A state-of-the-art strong-lensing model of MACS J0416.1-2403 with the largest sample of spectroscopic multiple images

by P. Bergamini, C. Grillo, P. Rosati, et al. 2023, A&A, 673, A79

The paper presents a new strong lensing model for the cluster MACS J0416.1-2403 using new data coming from HST multiband imaging and new VLT MUSE spectroscopy, as well as Chandra X-ray data on the intracluster hot-gas distribution and stellar kinematic information for 64 cluster galaxies. In particular, the new model exploits as many as 237 multiple images with spectroscopic redshifts, and this is the largest sample of multiply imaged sources available in any cluster to date. The new model obtained is better suited to accurately reproduce the positions, shapes, and fluxes of the observed multiple images, for example it can reproduce the position with an amazing accuracy of 0.4 arcsec +. The authors are making their model available to the community through the newly developed Strong Lensing Online Tool (SLOT), which allows users to obtain magnification values at any position in the field.