The EPS Research Astro-RAG Platform: A Unified Open-Science Infrastructure for Cross-Epoch Astrophysical Kinematic Analysis, LLM-Assisted Research Workflows, and Educational Outreach

Abstract

Correction (August 2026): A previously reported cross-epoch omega sign reversal was caused by a formula implementation error. Using the corrected canonical equation, all eight Tier-1 Z1 rotators yield positive omega values (median +12.621 rad Gyr^-1). The KROSS intermediate-redshift omega values are withdrawn because their boundary points were template-derived. The z = 0 SPARC result is unchanged. See CORRECTIONS.md for details. The EPS Research Astro-RAG Platform v1.0 is an open-science infrastructure providing five machine-readable astrophysical corpora, 149 verified executable Jupyter notebooks, a QuickStart reproducibility pathway, a High-School Exploration Track, and a roadmap for LLM-assisted retrieval-augmented generation (RAG) workflows. The platform spans redshift z = 0 to z approx 6 and provides a unified kinematic dataset connecting HI 21cm rotation curves, Milky Way globular cluster dynamics, intermediate-redshift KMOS/KROSS kinematics, and ALMA [CII] morpho-kinematics under a common schema. The five corpora contain 2,064 total records: 438 HI galaxies (Unified HI v7.0), 129 dwarf/irregular galaxies (Dwarf/Irregular v1.0), 174 Milky Way globular clusters (GC v1.3.2), 1,292 intermediate-redshift galaxies (IntZ v1.0), and 31 ALPINE galaxies at z = 4.26-5.68 (Z1). The Unified HI corpus preserves full SPARC photometric decomposition, including Vgas, Vdisk, Vbul, and surface brightness profiles, augmented with THINGS, LITTLE THINGS, and WALLABY DR2. The unifying scientific framework is the omega kinematic correction. Under the corrected formula, the z = 0 SPARC mean is +7.06 km s^-1 kpc^-1 (+7.22 rad Gyr^-1), and the Z1 median is +12.621 rad Gyr^-1. The earlier sign reversal is withdrawn. All corpora are released under CC BY 4.0 at Zenodo with permanent DOIs, and the platform is archived at https://github.com/eps-research/rag-corpus-series.

5 pages, no figures, no tables. Platform release: four open astrophysical corpora (772 objects, z=0 to z~6), 120 verified Jupyter notebooks, QuickStart reproducibility pathway, and High-School Exploration Track. Zenodo DOIs: 10.5281/zenodo.19563417, 10.5281/zenodo.20320362, 10.5281/zenodo.19907765, 10.5281/zenodo.20369285. GitHub: github.com/eps-research/rag-corpus-series