{
  "abstract": "The nearby dwarf starburst NGC 5253 is dominated by a compact radio-infrared supernebula powered by a very young and bright embedded super star cluster of ∼10 ⁹ L ⊙ . We observed this source and its surroundings over the 5–25 μ m range with the Mid-Infrared Instrument (MIRI) Medium Resolution Spectrometer (MRS) on JWST, and in Paper I presented the JWST view of the region and its continuum features. We now present the more than 70 emission lines of H I , H ₂ , and metal ions detected by MIRI/MRS. We derive the extinction by comparing H I recombination lines to the free–free radio continuum and find that it is very flat, i.e., almost independent of wavelength over this spectral range. Nebular conditions are consistent with young (≲5 × 10 ⁶ yr) and very massive stars. All regions show high excitation, but the spatial distribution of the high-excitation lines suggests that photons with energies close to 50 eV are escaping the supernebula core in spite of 35 mag of visual extinction.",
  "abstract_shown": true,
  "affiliations": [
    "Tel Aviv University",
    "UCLA",
    "Chalmers Institute of Technology",
    "Academia Sinica Astronomy and Astrophysics",
    "New Mexico Institute of Mining and Technology",
    "Instituto Nacional de Astrofísica Óptica y Electrónica"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 10,
  "authors": [
    {
      "affs": [
        0
      ],
      "name": "Sara C. Beck",
      "orcid": "0000-0002-5770-8494"
    },
    {
      "affs": [
        1
      ],
      "name": "Jean L. Turner",
      "orcid": "0000-0003-4625-2951"
    },
    {
      "affs": [
        1
      ],
      "name": "Elm Zweig",
      "orcid": "0000-0001-5678-7509"
    },
    {
      "affs": [
        2
      ],
      "name": "John H. Black",
      "orcid": "0000-0001-7221-7207"
    },
    {
      "affs": [
        3
      ],
      "name": "Paul T. P. Ho",
      "orcid": "0000-0002-3412-4306"
    },
    {
      "affs": [
        4
      ],
      "name": "David S. Meier",
      "orcid": "0000-0001-9436-9471"
    },
    {
      "affs": [
        5
      ],
      "name": "Sergiy Silich",
      "orcid": "0000-0002-3814-5294"
    },
    {
      "affs": [
        1
      ],
      "name": "Daniel P. Cohen",
      "orcid": "0000-0002-5221-2342"
    },
    {
      "affs": [
        1
      ],
      "name": "S. Michelle Consiglio",
      "orcid": "0000-0002-0214-0491"
    },
    {
      "affs": [
        1
      ],
      "name": "Nicholas G. Ferraro",
      "orcid": "0000-0002-9064-4592"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/16qt1z0v2fqpz.bib",
  "cited_by": 0,
  "doi": "10.3847/1538-4357/ae8519",
  "fulltext_url": null,
  "id": "16qt1z0v2fqpz",
  "issns": [
    "1538-4357",
    "0004-637X"
  ],
  "landing_url": "https://iopscience.iop.org/article/10.3847/1538-4357/ae8519",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "feed-journal",
      "astronomy/general"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://iopscience.iop.org/article/10.3847/1538-4357/ae8519/pdf",
  "pmcid": null,
  "pmid": null,
  "published": "2026-11-04",
  "publisher": "American Astronomical Society",
  "ris": "https://research.draconitic.com/paper/16qt1z0v2fqpz.ris",
  "sources": [
    {
      "first_seen": "2026-11-04T18:20:26Z",
      "native_id": "10.3847/1538-4357/ae8519",
      "source": "feed-iop",
      "url": "https://iopscience.iop.org/article/10.3847/1538-4357/ae8519"
    },
    {
      "first_seen": "2026-11-05T00:20:44Z",
      "native_id": "10.3847/1538-4357/ae8519",
      "source": "crossref",
      "url": "https://iopscience.iop.org/article/10.3847/1538-4357/ae8519"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "journal-openalex:3103|Stellar, planetary, and galactic studies",
      "subfield": "stellar"
    }
  ],
  "title": "JWST View of the Supernebula in NGC 5253. II. Nebular Lines",
  "title_text": "JWST View of the Supernebula in NGC 5253. II. Nebular Lines",
  "type": "peer-reviewed",
  "updated_at": "2026-11-06T00:21:00Z",
  "url": "https://research.draconitic.com/paper/16qt1z0v2fqpz",
  "venue": "The Astrophysical Journal",
  "versions": []
}