Object name: ARP111
Designation(s): ARP111, NGC5421,
Arp 111/NGC 5421 is a pair or trio of galaxies in eastern Canes Venatici about 360 million light-years away. Arp put it in his category of elliptical or elliptical-like galaxies repelling spiral arm of a companion spiral. Since gravity can't repel (or at least we have no evidence it can be a repelling force) I don't understand what Arp means. Apparently, this is meant to describe what appears to be happening rather than be what is really happening. In the time of Arp's atlas that was about all we could do. The arm of the spiral does seem to bend away from the elliptical like galaxy. Arp's comment "E galaxy apparently bending arm at root." This is likely just a descriptive comment. I hope he didn't think it was pushing the arm back, just positioned to look like that was happening. Though years later his strange physics allowed for some odd things but don't think that was one of them.