The particular type
of active galaxy seen then simply depends on the angle the accretion disk and dust ring are to the line of sight.
Not exact matches
Simulations
of galaxy formation suggest that such bright
galaxy mergers could form, but not in the numbers
seen during that
active epoch.
This is a very
active area
of research, and we hope to someday
see gas as it falls into these more normal
galaxies along these filamentary streams.