The two bright sources in the center are two supermassive black holes that orbit around a common center of mass and give energy to a powerful radio source 3C 75.
These supermassive black holes are separated by only 25 thousand years. They are immersed in a cloud of gas heated to several million degrees and emitting X-rays. Moreover, jets of relativistic particles escape from black holes. Black holes are the cores of two merging galaxies from the Abell 400 galaxy cluster, 300 million years distant from us.
These two supermassive black holes are bound by gravitational forces into a binary system. One of the signs of this is the observed type of jets, most likely due to the general movement of black holes through the hot gas of the cluster at a speed of 1200 km/s. Such spectacular mergers are quite common in densely populated clusters of galaxies in the distant universe.
