{
  "abstract": "Using bibliometric data from publication records, we investigate the institutional broadening of Japanese astronomy and astrophysics over 1996-2025. The number of Japan-affiliated publications increased from 588 to 2,156, and the number of unique participating Japanese institutions increased from 123 to 227, indicating a nominal broadening of the institutional base. However, institution-publication links remained concentrated among leading institutions, and the effective number of institutions, a frequency-weighted diversity measure, increased more gradually than the number of unique participating institutions. These results show that Japanese astronomy and astrophysics broadened institutionally, but not through a complete equalization of institutional participation. The observed change is best interpreted as an expansion of the participating institutional base around a persistent core of leading institutions.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.16633",
  "author_total": 1,
  "authors": [
    {
      "name": "Hideaki Fujiwara"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/25vcs1jb2e1e5.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.16633",
  "fulltext_url": null,
  "id": "25vcs1jb2e1e5",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.16633",
  "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.IM"
    ],
    [
      "openalex",
      "1804|scientometrics and bibliometrics research"
    ]
  ],
  "openalex": "W7221782354",
  "pdf_url": "https://arxiv.org/pdf/2610.16633",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-12",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/25vcs1jb2e1e5.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:29:06Z",
      "native_id": "2610.16633",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.16633"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.IM",
      "subfield": "instrumentation-methods"
    }
  ],
  "title": "Institutional broadening of the Japanese astronomy and astrophysics research community during 1996-2025",
  "title_text": "Institutional broadening of the Japanese astronomy and astrophysics research community during 1996-2025",
  "type": "preprint",
  "updated_at": "2026-10-30T12:29:06Z",
  "url": "https://research.draconitic.com/paper/25vcs1jb2e1e5",
  "venue": "arXiv",
  "versions": []
}