The discovery relied on observations from NASA’s Hubble Space Telescope and provide evidence of a binary black hole that suggests supermassive black holes assemble their masses through violent mergers.
“We are extremely excited about this finding because it not only shows the existence of a close binary black hole in Mrk 231, but also paves a new way to systematically search binary black holes via the nature of their ultraviolet light emission,” said Youjun Lu, National Astronomical Observatories of China, Chinese Academy of Sciences.
Lu collaborated on the project with Xinyu Dai of the University of Oklahoma.
“The structure of our universe, such as those giant galaxies and clusters of galaxies, grows by merging smaller systems into larger ones, and binary black holes are natural consequences of these mergers of galaxies,” said Dai.
So over time, the two black holes discovered by Dai and Lu in Mrk 231 will collide and merge to form a quasar with a supermassive black hole. A quasar is an active galaxy with an illuminated centre, which is short lived compared to the age of the Universe.