{
  "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 M$_{\\rm UV}=-19.78^{+0.12}_{-0.11}$, 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 $A_V=0.54\\pm0.09$ mag and UV slope of $β=-1.71\\pm0.26$ 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$^{++}$) = $(2.1 \\pm 0.2)\\times10^4$ K. Its spatially resolved nature, with an effective radius of $136 \\pm 9$ pc, together with the narrow FWHM of the emission lines ($\\lesssim 230$ km s$^{-1}$, or $σ_v \\lesssim 100$ 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.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.34827",
  "author_total": 18,
  "authors": [
    {
      "name": "L. Parente"
    },
    {
      "name": "E. Vanzella"
    },
    {
      "name": "M. Messa"
    },
    {
      "name": "A. Zanella"
    },
    {
      "name": "K. Nakajima"
    },
    {
      "name": "M. Ouchi"
    },
    {
      "name": "R. A. Windhorst"
    },
    {
      "name": "M. Talia"
    },
    {
      "name": "Y. Harikane"
    },
    {
      "name": "Y. Ono"
    },
    {
      "name": "A. M. Koekemoer"
    },
    {
      "name": "P. Bergamini"
    },
    {
      "name": "M. Meneghetti"
    },
    {
      "name": "P. Rosati"
    },
    {
      "name": "Y. Xu"
    },
    {
      "name": "H. Umeda"
    },
    {
      "name": "Y. Zhang"
    },
    {
      "name": "Y. Isobe"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/0khzrkfqtvvr5.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.34827",
  "fulltext_url": null,
  "id": "0khzrkfqtvvr5",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.34827",
  "language": null,
  "licence": "LicenseRef-arXiv-nonexclusive-1.0",
  "licence_label": "arXiv licence",
  "licence_source": "article",
  "licence_url": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "astro-ph.GA"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2609.34827",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-28",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/0khzrkfqtvvr5.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:25:12Z",
      "native_id": "2609.34827",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.34827"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.GA",
      "subfield": "galaxies"
    }
  ],
  "title": "DREAMS: Taking the Temperature of a Massive Galaxy at z ~ 11",
  "title_text": "DREAMS: Taking the Temperature of a Massive Galaxy at z ~ 11",
  "type": "preprint",
  "updated_at": "2026-10-30T12:25:12Z",
  "url": "https://research.draconitic.com/paper/0khzrkfqtvvr5",
  "venue": "arXiv",
  "versions": []
}