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arXiv · 2009.08458

The MUSE Deep Lensed Field on the Hubble Frontier Field MACS~J0416

E. Vanzella·G. B. Caminha·P. Rosati·A. Mercurio·M. Castellano·M. Meneghetti·C. Grillo·E. Sani·P. Bergamini·F. Calura·K. Caputi·S. Cristiani·G. Cupani·A. Fontana·R. Gilli·A. Grazian·M. Gronke·M. Mignoli·M. Nonino·L. Pentericci·P. Tozzi·T. Treu·I. Balestra·M. Dijkstra
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Abstract

Context: A census of faint and tiny star forming complexes at high redshift is key to improving our understanding of reionizing sources, galaxy growth and the formation of globular clusters. Aims: We present the MUSE Deep Lensed Field (MDLF) program. Methods: We describe Deep MUSE observations of 17.1 hours integration on a single pointing over the Hubble Frontier Field galaxy cluster MACS~J0416. Results: We confirm spectroscopic redshifts for all 136 multiple images of 48 source galaxies at 0.9 10 for individual objects down to de-lensed magnitude 28-30 suggesting that they are common in such faint sources. Conclusions:Deep MUSE observations, in combination with existing HST imaging, allowed us to:(1) confirm redshifts for extremely faint high-z sources;(2) peer into their internal clumps (down to 100-200 pc scale);(3) in some cases break down such clumps into bound star clusters (<20 pc scale);(4) double the number of constraints for the lens model,reaching an unprecedented set of 182 bona-fide multiple images and confirming up to 213 galaxy cluster members. These results demonstrate the power that JWST and future ELTs will have when combined to study gravitational telescopes.[abridged]

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E. Vanzella, G. B. Caminha, P. Rosati, A. Mercurio, M. Castellano, M. Meneghetti, C. Grillo, E. Sani, P. Bergamini, F. Calura, K. Caputi, S. Cristiani, G. Cupani, A. Fontana, R. Gilli, A. Grazian, M. Gronke, M. Mignoli, M. Nonino, L. Pentericci, P. Tozzi, T. Treu, I. Balestra, M. Dijkstra. 2020-09-17. The MUSE Deep Lensed Field on the Hubble Frontier Field MACS~J0416. https://doi.org/10.1051/0004-6361/202039466

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