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DREAMS: Taking the Temperature of a Massive Galaxy at z ~ 11

  • L. Parente
  • E. Vanzella
  • M. Messa
  • A. Zanella
  • K. Nakajima
  • M. Ouchi
  • R. A. Windhorst
  • M. Talia
  • Y. Harikane
  • Y. Ono
  • A. M. Koekemoer
  • P. Bergamini
6 more authors
  • M. Meneghetti
  • P. Rosati
  • Y. Xu
  • H. Umeda
  • Y. Zhang
  • Y. Isobe
Open at sourcePDFDOICite

Abstract

We present a detailed photometric and spectroscopic analysis of Janus-11, a $z=10.7933 \pm 0.0006 $ galaxy magnified by a factor 1.6 by the galaxy cluster MACS J0416. It was observed with JWST/NIRCam as part of the PEARLS program and with JWST/NIRSpec MSA as part of the DREAMS program. It has MUV=−19.78+0.12−0.11, and its stellar mass of log(M*/M_sun) = 8.75 (+0.08/-0.10) places it among the most massive known z>10 galaxies, while its AV=0.54±0.09 mag and UV slope of β=−1.71±0.26 are compatible with a red monster classification, albeit among the least obscured members of this population: this could hint at a transition from the red monster to the blue monster phase. Moreover, the [OIII]4363 detection allows for the highest-redshift metallicity measurement based on the [OIII]4363 direct method to date of 12 + log(O/H) = 7.74+0.11−0.10, together with an electron temperature of Te(O++) = (2.1 ± 0.2)×104 K. Its spatially resolved nature, with an effective radius of 136 ± 9 pc, together with the narrow FWHM of the emission lines (≲ 230 km s−1, or σv ≲ 100 km s−1), and the lack of significant detections of high-ionization emission lines and broad components, favor an SFG classification, although an AGN contribution cannot be excluded. Janus-11 joins the small sample of spectroscopically confirmed and characterized sources at z>10, providing new information on massive systems with non-negligible dust attenuation and well-measured metallicity in this epoch.

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Cite

BibTeXRIS
BibTeX
@misc{parente2026dreams,
  title = {{DREAMS: Taking the Temperature of a Massive Galaxy at z ~ 11}},
  author = {L. Parente and E. Vanzella and M. Messa and A. Zanella and K. Nakajima and M. Ouchi and R. A. Windhorst and M. Talia and Y. Harikane and Y. Ono and A. M. Koekemoer and P. Bergamini and M. Meneghetti and P. Rosati and Y. Xu and H. Umeda and Y. Zhang and Y. Isobe},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.34827},
  eprint = {2609.34827},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.34827},
}
RIS
TY  - UNPB
TI  - DREAMS: Taking the Temperature of a Massive Galaxy at z ~ 11
AU  - L. Parente
AU  - E. Vanzella
AU  - M. Messa
AU  - A. Zanella
AU  - K. Nakajima
AU  - M. Ouchi
AU  - R. A. Windhorst
AU  - M. Talia
AU  - Y. Harikane
AU  - Y. Ono
AU  - A. M. Koekemoer
AU  - P. Bergamini
AU  - M. Meneghetti
AU  - P. Rosati
AU  - Y. Xu
AU  - H. Umeda
AU  - Y. Zhang
AU  - Y. Isobe
PY  - 2026
DA  - 2026/09/28
PB  - arXiv
DO  - 10.48550/arxiv.2609.34827
UR  - https://arxiv.org/abs/2609.34827
AB  - We present a detailed photometric and spectroscopic analysis of Janus-11, a $z=10.7933 \pm 0.0006 $ galaxy magnified by a factor 1.6 by the galaxy cluster MACS J0416. It was observed with JWST/NIRCam as part of the PEARLS program and with JWST/NIRSpec MSA as part of the DREAMS program. It has M_UV=−19.78^+0.12_−0.11, and its stellar mass of log(M*/M_sun) = 8.75 (+0.08/-0.10) places it among the most massive known z>10 galaxies, while its A_V=0.54±0.09 mag and UV slope of β=−1.71±0.26 are compatible with a red monster classification, albeit among the least obscured members of this population: this could hint at a transition from the red monster to the blue monster phase. Moreover, the [OIII]4363 detection allows for the highest-redshift metallicity measurement based on the [OIII]4363 direct method to date of 12 + log(O/H) = 7.74^+0.11_−0.10, together with an electron temperature of T_e(O^++) = (2.1 ± 0.2)×10^4 K. Its spatially resolved nature, with an effective radius of 136 ± 9 pc, together with the narrow FWHM of the emission lines (≲ 230 km s^−1, or σ_v ≲ 100 km s^−1), and the lack of significant detections of high-ionization emission lines and broad components, favor an SFG classification, although an AGN contribution cannot be excluded. Janus-11 joins the small sample of spectroscopically confirmed and characterized sources at z>10, providing new information on massive systems with non-negligible dust attenuation and well-measured metallicity in this epoch.
ER  -