{
  "abstract": "We report [O\\,\\textsc{iii}] narrow-band imaging of an extremely large-scale nebula, the Silk Nebula, discovered by the SWONS (Super Wide-Field [O\\,\\textsc{iii}] Narrow-band Survey), together with multi-fiber medium-resolution spectroscopic data covering the H$α$, [N\\,\\textsc{ii}], [S\\,\\textsc{ii}], and [O\\,\\textsc{iii}] emission lines, acquired with the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) as part of the Medium-Resolution Spectroscopic Survey of Nebulae (MRS-N). Based on 2,684 high-quality spectra, we measured its physical parameters, including relative line intensities, radial velocities (RVs), and full widths at half-maximum (FWHMs). The [S\\,\\textsc{ii}]/H$α$ ratio of the nebula significantly exceeds the shock-excitation threshold of 0.4. Its location in BPT diagnostic diagrams and spatial morphology of [O\\,\\textsc{iii}] both support the optical emission is dominated by shock-heated gas. The oxygen abundance is near solar and spatially uniform, consistent with a shock propagating into the ambient interstellar medium. Because [O\\,\\textsc{iii}] is the only emission line that clearly traces the nebular morphology, we base our distance estimate exclusively on the [O\\,\\textsc{iii}] kinematics, obtaining a fiducial distance of $\\sim$160 pc. At this distance, the nebula has a physical extent of $\\sim$28 pc along the north-south direction. We suggest that the Silk Nebula is a large [O\\,\\textsc{iii}] filament possibly associated with a supernova remnant, although a diffuse-ionized-gas (DIG) or ionized-bubble origin cannot be ruled out with the present data, and one of the largest angular-scale [O\\,\\textsc{iii}] emission structures documented to date. Future deep X-ray observations and shock-modeling efforts are required to firmly establish its nature.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.13329",
  "author_total": 17,
  "authors": [
    {
      "name": "Yi-Fei Wu"
    },
    {
      "name": "Songyu Jia"
    },
    {
      "name": "Chao-Jian Wu"
    },
    {
      "name": "Chao Zhang"
    },
    {
      "name": "Li-Yue Zhang"
    },
    {
      "name": "Shu Wang"
    },
    {
      "name": "Juan-Juan Ren"
    },
    {
      "name": "Quzhen Dongyang"
    },
    {
      "name": "Hong-Yun Qiu"
    },
    {
      "name": "Zhi-Hong He"
    },
    {
      "name": "Jichen Zhang"
    },
    {
      "name": "Guo-You Sun"
    },
    {
      "name": "Wei-Guo Zhang"
    },
    {
      "name": "Jian-Jun Chen"
    },
    {
      "name": "Hong-Liang Yan"
    },
    {
      "name": "Xiang-Song Fang"
    },
    {
      "name": "Hong Wu"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/dt7k16g6xfn4m.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.13329",
  "fulltext_url": null,
  "id": "dt7k16g6xfn4m",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.13329",
  "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",
      "3103|Astrophysics and Star Formation Studies"
    ]
  ],
  "openalex": "W7221525878",
  "pdf_url": "https://arxiv.org/pdf/2610.13329",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-09",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/dt7k16g6xfn4m.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:28:36Z",
      "native_id": "2610.13329",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.13329"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.GA",
      "subfield": "galaxies"
    }
  ],
  "title": "The Silk Nebula: A Newly Discovered Giant [OIII] Emission Filament",
  "title_text": "The Silk Nebula: A Newly Discovered Giant [OIII] Emission Filament",
  "type": "preprint",
  "updated_at": "2026-10-30T12:28:36Z",
  "url": "https://research.draconitic.com/paper/dt7k16g6xfn4m",
  "venue": "arXiv",
  "versions": [
    {
      "doi": "10.3847/1538-3881/aeb11c",
      "pid": "80nxv4811yacc",
      "relation": "published-as",
      "title": "The Silk Nebula: A Newly Discovered Giant [O iii ] Emission Filament",
      "venue": "The Astronomical Journal"
    }
  ]
}