A team of astronomers have conducted a search for distant super massive
black holes and they have found 83 of them. See:
What is interesting is that contrary to the expectations of the big bang hypothesis, the density of those beasts is not at all higher than now.
According to BB theory, the neutral hydrogen was reionized after the
"dark ages". Where would the huge amount of energy necessary for
reionization come from?
The standard answer was that massive black holes would provide it...
apparently the density of black holes 13 Gy ago was no higher than now.
We are at the limit of current scopes. I am confident that in a few
years we will find even farther away quasars.
[[Mod. note --
2. Did Matsuoka et al discuss the space density of such quasars? I don't
see anything about that in a quick skim of their preprint.
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