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

Dheeraj R PashamFrancesco TombesiPetra SukováMichal ZajačekSuvendu RakshitEric R CoughlinPeter KosecVladimir KarasMegan MastersonAndrew MummeryThomas W-S HoloienMuryel GuoloJason HinkleBart RipperdaVojtěch WitzanyB J ShappeeErin KaraAssaf HoreshSjoert van VelzenItai SfaradiDavid L KaplanNoam BurgerTara MurphyRonald RemillardJames F SteinerThomas WeversRiccardo ArcodiaJohannes BuchnerAndrea MerloniAdam MalyaliAndrew C FabianMichael FausnaughTansu DaylanDiego AltamiranoAnna PayneElizabeth C Ferrara
Published in: Science advances (2024)
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 galactic nucleus after an outburst, likely caused by a stellar tidal disruption. We rule out several models based on observed properties and instead show using general relativistic magnetohydrodynamic simulations that QPOuts, separated by roughly 8.3 days, can be explained with an intermediate-mass black hole secondary on a mildly eccentric orbit at a mean distance of about 100 gravitational radii from the primary. Our work suggests that QPOuts could be a new way to identify intermediate/extreme-mass ratio binary candidates.
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