'Up until now, such a concentration of three supermassive black holes had never been discovered in the universe,' Peter Weilbacher, from the Leibniz Institute for Astrophysics Potsdam, said.
NGC 6240 is slightly unusual because of its irregular shape. Scientists long thought that it was formed by the collision of two smaller galaxies and, thus, contained two black holes at its center. However, the latest high-resolution observations revealed something unexpected.
The astronomers say that each of these supermassive black holes has a mass more than 90 million times greater than that of the sun. They are located in a region of space that is less than 3,000 light-years across. The irregular galaxy NGC 6240. New observations show that it harbors not two but three supermassive black holes at its core. The northern black hole is active and was known before. The zoomed-in new high-spatial resolution image shows that the southern component consists of two supermassive black holes The green color indicates the distribution of gas ionized by radiation surrounding the black holes.
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