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PKS 1302-102
PKS 1302-102 is a quasar with a binary-supermassive black hole pair, located in the Virgo constellation, some away. It is the first quasar discovered with two supermassive black holes sitting within its accretion disc.〔 〕〔 〕 As of 2015, it is one of the few black hole binaries known, and was found in a survey of quasar variability in a group of 20 candidates, and the best candidate known, better than the prior best, OJ 287.〔 〕 The quasar is hosted by an elliptical galaxy.〔 There are two neighbouring galaxies near the quasar.〔
==Binary black hole system==
The two supermassive black holes are merging, and are 180 billion miles () apart,〔 comparable to the separation between the Sun and the Oort Cloud in our Solar System. They are calculated to have merged 3.339 billion years ago and the light from this event should reach Earth within about a million years. The orbiting of the two black holes is causing a 5-year (1884 days) periodic flicker of 14% in the output of the quasar. It is anticipated that when the black holes do merge, it will result in an explosion 100 million times more energetic than a supernova.〔 〕 This system is important in astrophysics, as the final parsec problem concerning mergers of supermassive black holes remains unsolved.〔 〕 The nature of the system was spotted in data from the Catalina Real-Time Transient Survey.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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