Supermassive black holes, existing in galaxies, can reach millions or billions of solar masses. They cannot be detected by LIGO and instead require advanced instruments such as LISA. In galactic mergers, supermassive black holes undergo inspirals and mergers, exemplified by OJ 287, a binary black hole system discovered in 1887. OJ 287 consists of two black holes with masses of 150 million and 18 billion solar masses, completing an orbit every 11-12 years. General relativity impacts their orbits significantly, leading to precessions and unique flaring bursts. This system will merge in approximately 10,000 years, creating an immense gravitational wave energy release.
Supermassive black holes exist within galaxies, significantly heavier than normal black holes, requiring advanced detectors like LISA for direct observation.
Galactic mergers lead to inspirals and ringdowns of supermassive black holes, with OJ 287 being the heaviest binary known, completing an orbit every 11-12 years.
General relativity causes substantial precession in the orbits of supermassive black holes, with OJ 287's orbit precessing by 39° per revolution.
The merger of OJ 287's black holes will release an enormous amount of gravitational wave energy in about 10,000 years, a significant astronomical event.
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