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Meneghetti, M. Messa, M. Mignoli, M. Ricotti, N. A. Grogin, P. Bergamini, P. Rosati, R. Gilli, R. Pascale, R. Windhorst, S. Ravindranath, U. Mestric, V. Strait","submitted_at":"2024-07-29T18:00:01Z","abstract_excerpt":"We report the serendipitous discovery of a faint (M_UV > -12.2), low-metallicity (Z ~ 0.02 Zsun), ionizing source (dubbed T2c) with a spectroscopic redshift of z=6.146. T2c is part of a larger structure amplified by the Hubble Frontier Field galaxy cluster MACSJ0416, and was observed with JWST/NIRSpec IFU. Stacking the short-wavelength NIRCam data reveals no stellar continuum detection down to a magnitude limit of m_UV ~ 31.0 (3 sigma). However, prominent Hb, [OIII]4959,5007, and Ha emissions are detected, with equivalent widths exceeding 200A, 800A, and 1300A (3 sigma), respectively. 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