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The astrophysical origin of binary black hole (BBH) mergers remains uncertainthough many events have been observed by the LIGO-Virgo-KAGRA network. Suchmergers are predicted to originate in the vicinity of massive black holes(MBHs). Especially, GW190814, due to its secondary mass and mass ratio beingbeyond the expectations of isolated stellar evolution theories, is a promisingevent that has happened in an active galactic nucleus(AGN) disk. In this model,a compact object resides in the vicinity of a merging BBH. Here we reportmultiple pieces of evidence pointing to the fact that GW190814 is a BBH mergingnear a compact object. The orbital motion of BBHs around the third bodyproduces a line-of-sight acceleration (LSA) and induces a varying Dopplershift. Using a waveform template that considers LSA, we perform Bayesianinference on a few BBH events with a high signal-to-noise ratio in thegravitational-wave transient catalog (GWTC). Compared to the model for isolatedBBH mergers, we obtain significantly higher network signal-to-noise ratios forGW190814 by that with the LSA and constrain the LSA to $a =0.0014^{+0.0014}_{-0.0022} ~c~\mathrm{s}^{-1}$. In addition, the logarithmicBayes factor for the LSA case over the isolated case is $16.6$, which means theLSA model is significantly preferred by the GW data. We conclude that this isthe first indication showing merging BBHs are located near a compact object.

Indication for a compact object next to a LIGO-Virgo binary black hole merger