A group consisting of four galaxies - Hg 87. The galaxies constantly interact gravitationally. The largest galaxy in the group is the lowest spiral galaxy. Like the elliptic galaxy on the right, it contains active galaxy nuclei and is supposed to have a black hole in the center. The Center's answer - An elliptic object can be distinguished in a system of objects, not galaxies. They are linked by a common field but the elliptic object is the main component of this connection since it can take energy from other clusters to replenish its field.