Potential Virial AGN Mass Estimators
•Source Radius
•X-ray Fe Kα 3-10 Rs
•Broad-Line Region 600 Rs
•Megamasers 4x104 Rs
•Gas Dynamics 8x105 Rs
•Stellar Dynamics 106 Rs
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•Where Schwarzschild radius Rs = 2GM/c2 = 3x1013 M8 cm
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