Reverberation Mapping · Light Echoes
unseel.com · AGN · broad-line region · black-hole mass
Lag τ — ld
Mass
Stage
Continuum disk (source)
Light echo (c·τ)
Broad-line gas clouds
Virial mass M = f·c·τ·ΔV²/G
Unseel.com · Reverberation Mapping