### 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 local galaxies,
e.g., the Milky Way.
The conclusion is based on a calculation of the
expected population statistics of such black holes
now based upon that of distant quasars.

(*theory,quasars,black holes*)
http://en.wikipedia.org/wiki/Soltan_argument

http://adsabs.harvard.edu/abs/1982MNRAS.200..115S

https://arxiv.org/abs/1512.05452

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