RD Galaxy Dynamics Phase-Transition Dataset (SPARC + ATLAS³D)

This dataset contains the complete empirical foundation for the unified dynamical timescale τ, constructed from kinematic scale competition between the dynamical coherence length ξ_GL and the baryonic confinement scale r_core. The dataset includes 165 SPARC rotation-supported disk galaxies and 50 ATLAS³D pressure-supported elliptical galaxies with TDGL (Time-Dependent Ginzburg–Landau) inspired fits to rotation curves and velocity dispersion profiles. All derived parameters (ξ_GL, r_core, τ) are provided with fit diagnostics (χ²_red, κ₁) along with Python scripts for full reproducibility. Key empirical results demonstrate strong bimodality (Anderson-Darling A²=6.12, p<10⁻⁵): 97% of rotation-supported galaxies exhibit τ>0 (coherence-dominated regime, median +21.2 Myr), while 96% of pressure-supported galaxies exhibit τ<0 (confinement-dominated regime, median -13.0 Myr). Lenticular (S0) galaxies cluster near the structural boundary at τ≈0. The timescale τ correlates with long-term baryonic history (gas fraction, stellar age) but shows no correlation with instantaneous star formation or environment after morphology stratification. Files included:• Raw SPARC and ATLAS³D datasets• TDGL fitting code (rotation curves and Jeans modeling)• Per-galaxy parameter tables for 215 galaxies (Tables A1, A2)• Publication-quality figures demonstrating bimodality and correlations• Complete methodology and results documentation This dataset supports independent replication, verification, and extension of the unified dynamical timescale framework for galaxy dynamics across the Hubble sequence.