{
  "abstract": "We present NOEMA CO(1-0) observations of the inner $\\sim$500 pc of M33 at a resolution of $0.91''\\times0.37''$ ($3.7\\times1.5$ pc), resolving the compact molecular gas structures and revealing their relation to recent massive star formation. The most prominent structure is a southeastern molecular filament (SE filament) that extends 76 pc along its principal axis, is 23 pc wide, and contains three CO-bright knots. Across eight independent transverse cuts, the adjacent H$α$ ridge is displaced preferentially to one side of the principal CO ridge by a median $10.0^{+0.9}_{-1.4}$ pc. Young OB candidates are more closely associated with H$α$ than with compact CO. The filament shows little velocity change along its length but a resolved gradient across its minor axis. Its elongated morphology, transverse kinematics, and ordered CO-H$α$ distribution are consistent with locally asymmetric molecular-gas compression and subsequent massive star formation. Across the wider field, 23 well-measured compact clumps have a median radius of 2.67 pc and a median velocity dispersion of 2.15 km s$^{-1}$. Their linewidth and apparent virial-parameter distributions show no clear difference between the SE filament and the rest of the field. Although the local spiral potential and pattern speed remain unconstrained, the observations provide a resolved view of a compression-compatible molecular-to-ionized-gas sequence in the center of M33.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.35278",
  "author_total": 12,
  "authors": [
    {
      "name": "Zongnan Li"
    },
    {
      "name": "Zhiyuan Li"
    },
    {
      "name": "Gan Luo"
    },
    {
      "name": "Sheng-Yuan Liu"
    },
    {
      "name": "Sihan Jiao"
    },
    {
      "name": "Fanyi Meng"
    },
    {
      "name": "Zhiyuan Ren"
    },
    {
      "name": "Daisuke Iono"
    },
    {
      "name": "Jiachang Zhang"
    },
    {
      "name": "Di Li"
    },
    {
      "name": "Chao-Wei Tsai"
    },
    {
      "name": "Jongsoo Kim"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/33qs4907371ep.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.35278",
  "fulltext_url": null,
  "id": "33qs4907371ep",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.35278",
  "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": "W7224008366",
  "pdf_url": "https://arxiv.org/pdf/2610.35278",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-26",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/33qs4907371ep.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:35:35Z",
      "native_id": "2610.35278",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.35278"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.GA",
      "subfield": "galaxies"
    }
  ],
  "title": "NOEMA Observations of the Center of M33: A Parsec-scale Molecular Filament and an Ordered Gas-Star-Formation Sequence",
  "title_text": "NOEMA Observations of the Center of M33: A Parsec-scale Molecular Filament and an Ordered Gas-Star-Formation Sequence",
  "type": "preprint",
  "updated_at": "2026-10-30T12:35:35Z",
  "url": "https://research.draconitic.com/paper/33qs4907371ep",
  "venue": "arXiv",
  "versions": []
}