Institutional broadening of the Japanese astronomy and astrophysics research community during 1996-2025
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.
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BibTeX
@misc{fujiwara2026institutional,
title = {{Institutional broadening of the Japanese astronomy and astrophysics research community during 1996-2025}},
author = {Hideaki Fujiwara},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.16633},
eprint = {2610.16633},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.16633},
}
RIS
TY - UNPB
TI - Institutional broadening of the Japanese astronomy and astrophysics research community during 1996-2025
AU - Hideaki Fujiwara
PY - 2026
DA - 2026/10/12
PB - arXiv
DO - 10.48550/arxiv.2610.16633
UR - https://arxiv.org/abs/2610.16633
AB - 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.
ER -