Example for Herbig Haro Black Holes in RCW 37 creating Gas Cavities.
There are by now only a few photos of Herbig Haro systems formed in the deep field short after the Big bang. see below:
We should look for dual H2 clouds created by dual Herbig Haro Black Holes from the Big Bang in the deep field.
( Dual Star- and later Galaxy forming Black Holes.)
Also observed more close by:
