One scenario involves the gradual disturbance of a well - ordered disk of stars as a result of mergers with small satellite galaxies. (keckobservatory.org)
Two of those have been confirmed as dwarf satellite galaxies so far. (sciencedaily.com)
It doesn't have gigantic regions of star formation in its arms, it doesn't have a rectangular bar in its center, it doesn't appear to have large satellite galaxies. (discovermagazine.com)