The quasar J0204+1514 shows a 7.9-year astrometric wobble that the authors model as a supermassive black hole binary destined to emit gravitational waves.
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Milliarcsecond astrometric oscillations in active galactic nuclei as a precursor of multi-messenger gravitational wave events
The quasar J0204+1514 shows a 7.9-year astrometric wobble that the authors model as a supermassive black hole binary destined to emit gravitational waves.