{
  "abstract": "We present trigonometric parallaxes and proper motions for eight maser sources associated with high-mass star-forming regions. Four 22 GHz H$_2$O masers and four 6.7 GHz CH$_3$OH masers were observed over eight epochs between 2024 and 2025. Combining parallax, proper-motion, and radial-velocity information, we determine distances and spiral-arm assignments for these sources. The newly measured far-side masers extend the known distributions of the Sagittarius and Perseus arms toward Galactic longitudes as small as $\\ell\\sim10^\\circ$. Their locations and kinematics agree well with recently updated spiral-arm models based on maser astrometry. In particular, the new measurements show that the far-side Sagittarius and Perseus arms tend to converge toward a common spiral feature in the inner Galaxy. This configuration is consistent with the bifurcation scenario proposed for the Milky Way spiral structure, although an unresolved inter-arm structure provides an alternative interpretation that cannot yet be excluded.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.34219",
  "author_total": 5,
  "authors": [
    {
      "name": "Z. H. Lin"
    },
    {
      "name": "Y. Xu"
    },
    {
      "name": "M. Reid"
    },
    {
      "name": "J. J. Li"
    },
    {
      "name": "S. B. Bian"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/7tmm34wnjmg3p.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.34219",
  "fulltext_url": null,
  "id": "7tmm34wnjmg3p",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.34219",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "astro-ph.GA"
    ],
    [
      "openalex",
      "3103|Astrophysics and Star Formation Studies"
    ]
  ],
  "openalex": "W7214760270",
  "pdf_url": "https://arxiv.org/pdf/2609.34219",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-28",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/7tmm34wnjmg3p.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:25:12Z",
      "native_id": "2609.34219",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.34219"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.GA",
      "subfield": "galaxies"
    }
  ],
  "title": "Trigonometric Parallaxes of Maser Sources toward the Far Side of the Milky Way",
  "title_text": "Trigonometric Parallaxes of Maser Sources toward the Far Side of the Milky Way",
  "type": "preprint",
  "updated_at": "2026-10-30T12:25:12Z",
  "url": "https://research.draconitic.com/paper/7tmm34wnjmg3p",
  "venue": "arXiv",
  "versions": []
}