Comunicazione
High-precision strong lensing models of galaxy clusters in the JWST era.
Bergamini P., Grillo C., Rosati P., Acebron A., Mercurio A., Meneghetti M., Vanzella E., Mevstrić U., Granata G., Angora G., Caminha G. B., Treu T., Nonino M., Castellano M., Fontana A.
Since its launch, the high angular resolution and sensitivity of the JWST are revolutionizing our way of studying the Universe by allowing for the identification of stellar ensembles up to $z\sim 13$. By combining the JWST data with the magnification power of strong gravitational lensing (SL) by galaxy clusters (GCs), we can further improve the JWST capabilities and resolve sources assembling during the first billion years. In this context, I will present state-of-the-art SL models for the HFF GCs Abell 2744 and MACSJ0416. Both models are constrained by the two largest datasets of multiple images used to date (counting 149 and 237 images) identified by combining the data of the JWST, the HST, and the VLT. The MUSE spectra are used to measure the stellar velocity dispersion of tens of cluster galaxies, which are exploited to independently constrain the subhalo mass component of the GCs. Remarkably, the two SL models have a precision of 0.43" in predicting the positions of the multiple images. Our SL models represent a significant step forward in accurately mapping the GC total mass distributions and play a key role in current and future studies of GCs and magnified high-$z$ galaxies.