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Furtak, Marc Postman, Marusa Bradac, Massimo Ricotti, Matilde Mingozzi, Megan Donahue, Nimisha Kumari, Norbert Pirzkal, Pratika Dayal, Rebecca L. Larson, Rogier A. Windhorst, Seiji Fujimoto, Stephen M. Wilkins, Svea Hernandez, Taylor A. Hutchison, Tiger Yu-Yang Hsiao, Tom Broadhurst, Vasily Kokorev, Xinfeng Xu","submitted_at":"2023-05-04T17:58:30Z","abstract_excerpt":"We present JWST/NIRSpec prism spectroscopy of MACS0647-JD, the triply-lensed $z \\sim 11$ candidate discovered in HST imaging and spatially resolved by JWST imaging into two components A and B. Spectroscopy of component A yields a spectroscopic redshift $z=10.17$ based on 7 detected emission lines: CIII] $\\lambda\\lambda$1907,1909, [OII] $\\lambda$3727, [NeIII] $\\lambda$3869, [NeIII] $\\lambda$3968, H$\\delta$ $\\lambda$4101, H$\\gamma$ $\\lambda$4340, and [OIII] $\\lambda$4363. 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