High Red Shift Quasars

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"The relative dearth of high-redshift quasars means the conditions that form them are uncommon--i.e., a highly unusual set of conditions can do the trick, creating "seeds" that grow quickly into quasars. As University of Texas at Austin astrophysist Volkar Bromm says, "We only need very few seeds to explain the observed billion-solor-mass quasars at high redshift."

Astronomy Magazine March  2021 "How to Grow a Giant Black Hole" p. 19