| Arp 107 | |
| Type: | SA(s)cP / E1P |
| H Radial V: | 10167 km/s |
| Z: | 0.03451 |
| Appmag B: | 14.6[1] |
| Size V: | 1.40' × 0.11' ? |
| Constellation Name: | Leo Minor |
| Notes: | interacting galaxies |
| Size: | 348,000 ly (PGC 32620), 70,000 ly (PGC 32628) |
Arp 107 is a pair of interacting galaxies (designated separately as UGC 5984 and MCG+05-26-025) located about 450 million light-years away in the constellation Leo Minor. The galaxies are in the process of colliding and merging.[2]
Arp 107 is made of two separate galaxies. The larger galaxy to the left is PGC 32620, and the smaller galaxy to the right is PGC 32628, (as depicted in the Hubble image). These galaxies are different in which one is a spiral galaxy while the other one is an elliptical galaxy being connected by a bridge and tidal tail made of dust and gas.[3] [4]
The nucleus of PGC 32620 is active and it is classified as a type 2 Seyfert galaxy.[5] [6] Additionally, the galaxy is depicted having a ring-like appearance. The most likely scenario for this appearance in PGC 32620, is that the elliptical galaxy penetrated through its disk, causing it to become semi-annular with a large single spiral arm protruding out. This spiral arm in turn, then branches out in a form of a tidal arm, where star-forming regions of both old and young star populations are present.[7]