That :primmer" showed galaxies all festooned at totally disfferent orientations. How then can they make the statement that black holes are aligned (assuming that some significant percentage of all these galaxies contain black holes).
I don't think the black holes they are talking about are necessarily the black holes which populate the center of every galaxy. I think these are simply black holes within the galaxies which happen to be producing these "jets". So, to picture it, the galaxies are tumbling along within the filament such that their central axes point in different directions, but within those galaxies are black holes which are spinning and which are producing jets from their polar axes, and those jets either form in orientation to the filament, or they maintain their orientation to the filament even as the galaxies tumble.
Imagine the forces required to change the axial tilt of a black hole. These things are essentially the most intense gyroscopes in existence. And even earthly gyroscopes don't like to be moved. Black holes are like tornado's of intense spin within the hurricane of the galaxy itself.
Im still trying to understand a simple point"ALIGNED" with respect to what?.
I would like to help with this, but I don't understand what is bothering you with "alignment". As I understand it (and I may be wrong), these jets are aligned relative to each other as initially discovered. This observation implied a larger scale structure which might cause this correspondence of alignment. So in looking for a larger structure which might cause this, they found a correspondence to the cosmic filament.