PRISMS. GHZ1. A standard tale of galaxy evolution with atypical ionizing conditions at z=9.878

@misc{perezdiaz2026prisms,
  title = {{PRISMS. GHZ1. A standard tale of galaxy evolution with atypical ionizing conditions at $z=9.878$}},
  author = {Borja Pérez-Díaz and Marco Castellano and Javier Álvarez-Márquez and Luis Colina and Lorenzo Napolitano and Sarah Kendrew and Alejandro Crespo Gómez and Stefano Carniani and Shouyi Wang and Fan Zou and Abdurro'uf and Arjan Bik and Karina Caputi and Román Fernández-Aranda and Adriano Fontana and Yoshinobu Fudamoto and Macarena García-Marín and Mahmoud Hamed and Yuichi Harikane and Takuya Hashimoto and Jakob M. Helton and Tiger Y. -Y. Hsiao and Danial Langeroodi and Ruqiu Lin and Rui Marques-Chaves and Göran Östlin and Pablo G. Pérez-González and Enrico Piconcelli and Carlota Prieto-Jiménez and Pierluigi Rinaldi and Guido Roberts-Borsani and Bruno Rodríguez del Pino and Paola Santini and Tommaso Treu and Ana Varo-O'Ferrall and Jorge Zavala},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.14574},
  eprint = {2609.14574},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.14574},
  note = {CC BY 4.0},
}

TY  - UNPB
TI  - PRISMS. GHZ1. A standard tale of galaxy evolution with atypical ionizing conditions at z=9.878
AU  - Borja Pérez-Díaz
AU  - Marco Castellano
AU  - Javier Álvarez-Márquez
AU  - Luis Colina
AU  - Lorenzo Napolitano
AU  - Sarah Kendrew
AU  - Alejandro Crespo Gómez
AU  - Stefano Carniani
AU  - Shouyi Wang
AU  - Fan Zou
AU  - Abdurro'uf
AU  - Arjan Bik
AU  - Karina Caputi
AU  - Román Fernández-Aranda
AU  - Adriano Fontana
AU  - Yoshinobu Fudamoto
AU  - Macarena García-Marín
AU  - Mahmoud Hamed
AU  - Yuichi Harikane
AU  - Takuya Hashimoto
AU  - Jakob M. Helton
AU  - Tiger Y. -Y. Hsiao
AU  - Danial Langeroodi
AU  - Ruqiu Lin
AU  - Rui Marques-Chaves
AU  - Göran Östlin
AU  - Pablo G. Pérez-González
AU  - Enrico Piconcelli
AU  - Carlota Prieto-Jiménez
AU  - Pierluigi Rinaldi
AU  - Guido Roberts-Borsani
AU  - Bruno Rodríguez del Pino
AU  - Paola Santini
AU  - Tommaso Treu
AU  - Ana Varo-O'Ferrall
AU  - Jorge Zavala
PY  - 2026
DA  - 2026/09/13
PB  - arXiv
DO  - 10.48550/arxiv.2609.14574
UR  - https://arxiv.org/abs/2609.14574
AB  - [Abridged] The first operating years of the James Webb Space Telescope (JWST) have revealed a surprising number of z ≳ 10 UV-bright objects, many of them characterized by their compactness, anomalous chemical abundance patterns and complex ISM physics (e.g. N-enhanced systems). To assess whether these objects are a phase of early galaxy evolution or a peculiar population, it is essential to understand the physics of systems without anomalous abundance patterns in this epoch. We present a detailed analysis of GHZ1 (z=9.878), a moderately (μ= 1.715) lensed UV-bright (M_UV = −20.07) galaxy in the Abell2744 field, characterized by an extended size (R_e ∼ 410 pc). These properties, which contrast with the properties of many of the N-enhanced galaxies, make GHZ1 an excellent laboratory to assess what are the major drivers of early galaxy evolution and the origin of the differences. By means of JWST spectroscopic observations from NIRSpec (PRISM-CLEAR configuration) and the MIR/LRS, we analyzed the full UV and optical emission from GHZ1. We used a spectro-photometric SED fitting to characterize the stellar evolution and the emission line spectra to constrain its chemical enrichment. We find that GHZ1 is among the most massive systems at z∼ 10 (log(M_⋆ [M_⊙]) = 9.17_−0.26^+0.27), with a moderate amount of dust attenuation (A_V = 0.21_−0.12^+0.12~mag) and ongoing star formation (with a median SFR = 8.75_−1.72^+1.71 M_⊙·yr^−1 over the last 10 Myr). Its chemical enrichment patterns (12+log(O/H) = 7.81_−0.11^+0.12, log(C/O) = −0.66_−0.13^+0.13, log(N/O)< −1.04) are consistent with a standard evolution dominated by primary production from massive stars. We also derive an Hα/Hβ Balmer ratio below Case B predictions. We speculate that [...].
ER  -