Re: The more I look at it . . .
It appears to have eaten another galaxy, as described at the picture-source. the inner region shows the arms trailing, as with any other galaxy, then, as we proceed further from the core, we come to another set of arms facing the opposite direction.
I'd like to know where the rotation was measured from, whether toard the core (more likely as the increased velocity would give a clear Doppler), or away, in the region of the 'erred' arms. the outer arms may still be rotating counterclockwise, and still being devoured.
Theory says the fate is similar to what created the Magellanic Clouds,
Dan
--ps--
Yes, I know my example was drawn in reverse of the HST shot -- but it ain’t easy!
;^)