How are the supermassive black holes of the galaxy centers formed?
A black hole with a mass of several hundred thousand to more than ten billion solar masses. The central region of virtually every galaxy is thought to contain an object of this type. The primary evidence for supermassive black holes comes from optical and radio observations which show a sharp rise in the velocities of stars or gas clouds orbiting the centers of galaxies. High orbital velocities mean that something massive is creating a powerful gravitational field which is accelerating the stars. Additionally, X-ray observations indicate that a large amount of energy is produced in the centers of many galaxies, presumably by material falling into the accretion disk that surrounds the central black hole. The current heavyweight champion of known supermassive black holes is that at the center of a quasar called OJ287. This quasar lies about 3.5 billion light-years away in the constellation Cancer. The mass of its central black hole, which is six times greater than that of the next neares
