2024/01/03 by Shu-Cheng Yang, Wen-Biao Han, Yang, Shu-Cheng +6 · 2 citations
Engineering · Physics and Astronomy · #Advanced Measurement and Metrology Techniques #FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc) #High Energy Astrophysical Phenomena (astro-ph.HE) #Model Reduction and Neural Networks #Pulsars and Gravitational Waves Research
paper · pdf · doi:10.48550/arxiv.2401.01743
openalex publication_date 2024/01/03 · openalex created_date 2024/01/05 · openalex updated_date 2026/07/28
The astrophysical origin of binary black hole (BBH) mergers remains uncertain, although many events have been observed by the LIGO-Virgo-KAGRA network. Such mergers are potentially originated in the vicinity of massive black holes (MBHs). GW190814, due to its secondary mass and mass ratio being beyond the expectations of isolated stellar evolution theories, is a promising event that has occurred in an active galactic nucleus (AGN) disk. In this model, a compact object resides in the vicinity of a merging BBH. Here we report multiple pieces of evidence suggesting that GW190814 is a BBH merging near a compact object. The orbital motion of BBHs around a third body produces a line-of-sight acceleration (LSA) and induces a varying Doppler shift. Using a waveform template that considers LSA, we perform Bayesian inference on a few BBH events with a high signal-to-noise ratio in the gravitational-wave (GW) transient catalog. Compared to the model for isolated BBH mergers, we obtain significantly higher network signal-to-noise ratios for GW190814 with the inclusion of LSA, constraining the LSA to a = 0.0015+0.0008-0.0008 ~c~s-1 at a 90 % confidence level. Additionally, the Bayes factor for the LSA case over the isolated case is 58/1, indicating that the GW data strongly prefer the LSA model. We conclude that this is the first indication showing merging BBHs are located near a third compact object.