星系核內的一個雙黑洞系統

mca

星系核內的一個雙黑洞系統 (指特大質量黑洞)

來源：Nature Sept 2015.  http://www.nature.com/nature/jou ... ll/nature15262.html

Because most large galaxies contain a central black hole, and galaxies often merge, black-hole binaries are expected to be common in galactic nuclei. Although they cannot be imaged, periodicities in the light curves of quasars have been interpreted as evidence for binaries, most recently in PG 1302-102, which has a short rest-frame optical period of four years. If the orbital period of the black-hole binary matches this value, then for the range of estimated black-hole masses, the components would be separated by 0.007–0.017 parsecs, implying relativistic orbital speeds. There has been much debate over whether black-hole orbits could be smaller than one parsec. Here we report that …..

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http://www.skyandtelescope.com/a ... 84734&rid=246425201