Unified Galaxy HI Rotation Curve Corpus (v4.0): SPARC + THINGS + LITTLE THINGS + WALLABY DR2

# Unified Galaxy HI Rotation Curve Corpus (v4.0)**SPARC + THINGS + LITTLE THINGS + WALLABY DR2**Flynn, D.C. (EPS Research) | ORCID: 0000-0002-2768-6650 | CC BY 4.0---A unified, semantically structured collection of HI galaxy rotation curves from four major surveys, designed for both numerical analysis and LLM/RAG-based astrophysical inference.**438 galaxies | 4 surveys | 2 quality tiers**| Survey | Galaxies | Tier ||--------|----------|------|| SPARC | 175 | 1 — hand-curated, full baryonic decomposition || THINGS | 34 | 1 — hand-curated, tilted-ring || LITTLE THINGS | 26 | 1 — hand-curated, dwarf irregulars || WALLABY DR2 | 203 | 2 — automated WKAPP pipeline |---## Files| File | Description ||------|-------------|| `rotation_curve_corpus_v4.json` | Master JSON, all 438 galaxies, unified schema || `rotation_curve_corpus_v4_flat.csv` | One row per galaxy, pandas-ready || `rotation_curve_corpus_v4_by_galaxy.zip` | 438 individual JSON files in survey subdirectories, RAG-optimised |---## Key features- Consistent units throughout (kpc, km/s)- Cross-survey galaxy matching with crossmatch index- Per-galaxy quality annotations and known-issues flags- THINGS radii converted from arcsec to kpc- Supports omega correction: V_obs(R) = V_kepler(R) + R × ω (Flynn & Cannaliato 2025)- Per-galaxy JSON format optimised for LLM vector store ingestion---## Cite asFlynn, D.C. (2026). *Unified Galaxy HI Rotation Curve Corpus (v4.0).* Zenodo. DOI: 10.5281/zenodo.19425428**Also cite underlying surveys:** Lelli et al. (2016); de Blok et al. (2008); Walter et al. (2008); Oh et al. (2015); Deg et al. (2022); Murugeshan et al. (2024); Westmeier et al. (2022).