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    First Detection of Secondary Supermassive Black Hole in a well-known Binary System

    June 7, 2023, Categories  Astronomy/Space

    Artistic illustration of OJ287 as a binary black hole system.
    Artistic illustration of OJ287 as a binary black hole system. The secondary black hole of 150 million solar masses moves around the primary black hole of 18 billion solar masses. A disk of gas surrounds the latter. The secondary black hole is forced to impact on the accretion disk twice during its 12-year orbit. The impact produces a blue flash which was detected in February 2022. In addition, the impact also induces the secondary black hole to bright bursts of radiation several weeks earlier, and these bursts have also been detected as a direct signal from the secondary black hole. Credit: AAS 2018

    An international team of astronomers observed the second one of the two supermassive black holes circling each other in an active galaxy OJ 287.

    Supermassive black holes that weigh sever...

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