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Soltan argument

(distant quasars imply SMBHs still exist)

The Soltan argument is the conclusion that assuming distant quasars are powered by black holes (i.e., supermassive black holes) in galaxies implies there must be quiet SMBHs in "ordinary" galaxies, i.e., those like the Milky Way and other local galaxies. The conclusion is based on a calculation of the expected population statistics of such current black holes based upon that of observed distant quasars.

(theory,quasars,black holes)
Further reading: