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What is the most important evidence that there is a supermassive black hole at the center of every QSO and AGN? How do we measure the masses of the black holes? What is the range of masses for the black holes?

What is the most important evidence that there is a supermassive black hole at the center of every QSO and AGN?

How do we measure the masses of the black holes? What is the range of masses for the black holes?

 
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