I'm not an astronomer, so maybe what I'm asking about is way off base, but is this ejection is similar to the discordant red shifts catalogued by Halton Arp? He noted that some quasars, which the standard model of the universe says are very distant objects, are associated with much nearer galaxies and that one interpretation (rejected by the astronomical community) was that they were ejected from the center of the associated galaxy.
He also noted that these ejections occurred in pairs, with two objects being ejected in opposite directions along the minor axis of the galaxy. I wonder if there is another, similar object on the opposite side of the Milky Way.
See Catalogue of Discordant Redshift Associations, Halton Arp, 2003.
I know his theories are considered outlandish, but the data he presents has, to my very limited knowledge, not been invalidated.