A Unified H i Rotation Curve Database for 129 Local Volume Dwarf and Irregular Galaxies

TL;DR

This paper introduces a standardized, comprehensive H i rotation curve database for 129 dwarf and irregular galaxies from four surveys, facilitating cross-survey analysis and applications.

Contribution

It provides a unified, well-documented database with standardized parameters and scripts, supporting advanced kinematic studies and retrieval-augmented generation applications.

Findings

Database includes 129 galaxies with diverse kinematic data.

Supports retrieval-augmented generation and cross-survey analysis.

Includes example applications demonstrating data queries and corrections.

Abstract

We present a unified H i rotation curve database for 129 dwarf and irregular galaxies drawn from four Local Volume surveys: the Local Volume H i Survey (LVHIS; 33 galaxies), VLA-ANGST (29), LITTLE THINGS (26), and WALLABY DR2 (41). The database provides standardised kinematic parameters, distance estimates, morphological classifications, and rotation curve data in machine-readable JSON, JSONL, and CSV formats with a documented 27-field schema, supporting retrieval-augmented generation (RAG) applications and cross-survey kinematic analysis. Quality tiers distinguish 26 galaxies with full multi-point tilted-ring rotation curves from 103 with single-ring or profile-width estimates. Three worked examples demonstrate corpus queries, including application of the {\omega} correction to DDO 154 (LITTLE THINGS). This work is presented as a data resource; no new dynamical model is proposed. The database and all computation scripts are available at Zenodo (https://doi.org/10.5281/zenodo.20320362).