Tully-Fisher Relation · L ∝ V⁴
unseel.com · spin predicts luminosity · scatter ~10%
slope α ≈ 4
scale a₀ 1.2×10⁻¹⁰ m/s²
beat
Spiral galaxy
Rotation curve
L–V scatter
BTF / MOND
Unseel.com · Tully-Fisher Relation