PRISMS. U37126, a very blue, ISM-naked starburst at z=10.255 with nearly 100% Lyman continuum escape fraction

R. Marques-Chaves; Javier Álvarez-Márquez; Luis Colina; S. Kendrew; Abdurro'uf; Carmen Blanco-Prieto; L. A. Boogaard; M. Castellano; K. I. Caputi; Alejandro Crespo Gómez; A. Fontana; Y. Fudamoto; S. Fujimoto; M. García-Marín; Yuichi Harikane; S. Harish; Takuya Hashimoto; T. Hsiao; Edoardo Iani; Akio K. Inoue; Danial Langeroodi; R. Lin; J. Melinder; L. Napolitano; Göran Östlin; Pablo G. Pérez‐González; Carlota Prieto-Jiménez; P. Rinaldi; Bruno Rodríguez Del Pino; Paola Santini; Yuma Sugahara; A. Varo-O'ferral; G. Wright; J. Zavala

PRISMS. U37126, a very blue, ISM-naked starburst at z=10.255 with nearly 100% Lyman continuum escape fraction

arXiv (Cornell University) 2026 Preprint Open access

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Authors: R. Marques-Chaves, Javier Álvarez-Márquez, Luis Colina, S. Kendrew, Abdurro'uf, Carmen Blanco-Prieto, L. A. Boogaard, M. Castellano, K. I. Caputi, Alejandro Crespo Gómez, A. Fontana, Y. Fudamoto

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S. Fujimoto, M. García-Marín, Yuichi Harikane, S. Harish, Takuya Hashimoto, T. Hsiao, Edoardo Iani, Akio K. Inoue, Danial Langeroodi, R. Lin, J. Melinder, L. Napolitano, Göran Östlin, Pablo G. Pérez‐González, Carlota Prieto-Jiménez, P. Rinaldi, Bruno Rodríguez Del Pino, Paola Santini, Yuma Sugahara, A. Varo-O'ferral, G. Wright, J. Zavala

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Abstract

We present very deep (~11h) JWST/MIRI low-resolution spectroscopy of the rest-frame optical emission of U37126, a UV-bright (M_UV ~ -20), mildly lensed ($μ\simeq 2.2$) galaxy at z=10.255. The continuum emission is well detected in both NIRSpec and MIRI spectra, yet no nebular recombination or metal emission lines are observed (EW(Hbeta+[OIII])

Fields of Study & Subjects

Galaxies: Formation Evolution Phenomena Astrophysics and Star Formation Studies Stellar planetary and galactic studies

Publication details

Journal / source: arXiv (Cornell University)
Publication date: 2 February 2026
Document type: Preprint