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A case for a binary black hole system revealed via quasi-periodic outflows

Steiner, James F.; Holoien, Thomas W. -S.; Daylan, Tansu +33 more

Binaries containing a compact object orbiting a supermassive black hole are thought to be precursors of gravitational wave events, but their identification has been extremely challenging. Here, we report quasi-periodic variability in x-ray absorption, which we interpret as quasi-periodic outflows (QPOuts) from a previously low-luminosity active ga…