In this Hubble image, the smaller galaxy is superimposed on the larger one, which is a type of active galaxy called a Seyfert galaxy.
The larger galaxy in this pair is a Type II Seyfert galaxy, meaning it is a very bright source of infrared and visible light.
According to NASA, Seyfert galaxies belong to the class of "active galaxies" – galaxies that have supermassive black holes at their centers accreting material, which releases vast amounts of radiation.