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Active galactic nuclei (AGNs) have been proposed as plausible sites for hosting a sizable fraction of the binary black hole (BBH) mergers measured through gravitational waves (GWs) by the LIGO-Virgo-Kagra (LVK) experiment. These GWs could…

High Energy Astrophysical Phenomena · Physics 2023-11-20 J. C. Rodríguez-Ramírez , C. R. Bom , B. Fraga , R. Nemmen

While the LIGO/Virgo/KAGRA (LVK) gravitational wave (GW) detectors have detected over 300 binary black hole (BBH) mergers to date, the first confirmation of an electromagnetic (EM) counterpart to such an event remains elusive. Previous…

High Energy Astrophysical Phenomena · Physics 2026-03-04 Tomás Cabrera , Antonella Palmese , Maya Fishbach

Accretion disks in active galactic nuclei (AGN) are promising sites for mergers of stellar-mass black holes (BHs) detectable via gravitational waves (GWs). These environments facilitate both in-situ formation and dynamical capture of…

High Energy Astrophysical Phenomena · Physics 2026-04-08 Hiromichi Tagawa , Zoltán Haiman , Shigeo S. Kimura , Hassen M. Yesuf , Hengxiao Guo

The majority of gravitational wave events detected by the LIGO, Virgo, and KAGRA Collaboration originate from binary black hole (BBH) mergers, for which no confirmed electromagnetic counterparts have been identified to date. However, if…

Despite the increasing number of Gravitational Wave (GW) detections, the astrophysical origin of Binary Black Hole (BBH) mergers remains elusive. A promising formation channel for BBHs is inside accretion discs around supermassive black…

High Energy Astrophysical Phenomena · Physics 2023-10-25 Niccolò Veronesi , Elena Maria Rossi , Sjoert van Velzen

The formation channels of binary black hole (BBH) mergers detected by the LIGO/Virgo/KAGRA (LVK) network remain uncertain. While BBH mergers occurring inside active galactic nucleus (AGN) disks may interact with surrounding gas and generate…

High Energy Astrophysical Phenomena · Physics 2026-03-19 Liang-Gui Zhu , Lei He , Xian Chen , Wen Zhao

The gravitational wave (GW) event GW190521, likely originating from a binary black hole (BBH) merger within an active galactic nucleus (AGN) disk, is associated with the optical flare ZTF19abanrhr. The remnant BHs from BBH mergers can…

High Energy Astrophysical Phenomena · Physics 2024-09-30 Zhi-Peng Ma , Kai Wang , Qingwen Wu , Jian-Min Wang

Binary black hole (BBH) mergers are the primary sources of gravitational wave (GW) events detected by LIGO/Virgo. Binary black holes embedded in the accretion discs of active galactic nuclei (AGN) are possible candidates for such GW events.…

Astrophysics of Galaxies · Physics 2020-07-22 W. Ishibashi , M. Gröbner

The origin of the Binary Black Hole (BBH) mergers detected through Gravitational Waves (GWs) by the LIGO-Virgo-KAGRA (LVK) collaboration remains debated. One fundamental reason is our ignorance of their host environment, as the typical size…

High Energy Astrophysical Phenomena · Physics 2022-05-24 Niccolò Veronesi , Elena Maria Rossi , Sjoert van Velzen , Riccardo Buscicchio

The accretion disks of active galactic nuclei (AGN) are promising environments for producing binary black hole (BBH) mergers, which have been detected via gravitational waves (GW) with LIGO-Virgo-KAGRA (LVK). BBH mergers embedded in AGN…

Motivated by the increasing number of detections of merging black holes by LIGO-VIRGO-KAGRA, black hole (BH) binary mergers in the discs of active galactic nuclei (AGN) is investigated as a possible merger channel. In this pathway, BH…

Astrophysics of Galaxies · Physics 2023-07-12 Connar Rowan , Tjarda Boekholt , Bence Kocsis , Zoltán Haiman

The astrophysical origin of gravitational wave (GW) transients is a timely open question in the wake of discoveries by LIGO/Virgo. In active galactic nuclei (AGNs), binaries form and evolve efficiently by interaction with a dense population…

High Energy Astrophysical Phenomena · Physics 2021-01-27 Hiromichi Tagawa , Bence Kocsis , Zoltan Haiman , Imre Bartos , Kazuyuki Omukai , Johan Samsing

The majority of gravitational wave (GW) events detected so far by LIGO/Virgo originate from binary black hole (BBH) mergers. Among the different binary evolution paths, the merger of BBHs in accretion discs of active galactic nuclei (AGNs)…

Astrophysics of Galaxies · Physics 2020-07-01 Matthias Gröbner , Wako Ishibashi , Shubhanshu Tiwari , Maria Haney , Philippe Jetzer

Binary black hole (BBH) mergers, particularly those with component masses in the pair-instability gap, may be produced by hierarchical mergers in the disks surrounding Active Galactic Nuclei (AGN). While the interaction of an embedded BBH…

High Energy Astrophysical Phenomena · Physics 2022-04-13 Ya-Ping Li , Adam M. Dempsey , Hui Li , Shengtai Li , Jiaru Li

The origin of stellar-mass black hole mergers discovered through gravitational waves is being widely debated. Mergers in the disks of active galactic nuclei (AGN) represent a promising source of origin, with possible observational clues in…

High Energy Astrophysical Phenomena · Physics 2023-06-14 Hiromichi Tagawa , Shigeo S. Kimura , Zoltán Haiman , Rosalba Perna , Imre Bartos

The accretion disks of active galactic nuclei (AGN) are widely considered the ideal environments for binary black hole (BBH) mergers and the only plausible sites for their electromagnetic (EM) counterparts. Graham et al.(2023) identified…

High Energy Astrophysical Phenomena · Physics 2025-07-04 Lei He , Zhengyan Liu , Rui Niu , Bingzhou Gao , Mingshen Zhou , Purun Zou , Runduo Liang , Wen Zhao , Ning Jiang , Zhen-Yi Cai , Zi-Gao Dai , Ye-Fei Yuan

The primary formation channel for the stellar-mass Binary Black Holes which have been detected merging by the LIGO-Virgo- KAGRA (LVK) collaboration is yet to be discerned. One of the main reason is that the detection of an Electromagnetic…

High Energy Astrophysical Phenomena · Physics 2025-01-06 Niccolò Veronesi , Sjoert van Velzen , Elena Maria Rossi

LIGO/Virgo has detected several binary black hole (BBH) merger events that may have originated in the accretion disks of Active Galactic Nuclei (AGN). These events require individual black hole masses that fall within the pair instability…

High Energy Astrophysical Phenomena · Physics 2022-12-07 Adam M. Dempsey , Hui Li , Bhupendra Mishra , Shengtai Li

The search for multi-messenger signals of binary black hole (BBH) mergers is crucial to understanding the merger process of BBH and the relative astrophysical environment. Considering BBH mergers occurring in the active galactic nuclei…

High Energy Astrophysical Phenomena · Physics 2023-11-07 Zi-Hang Zhou , Kai Wang

Stellar-mass binary black hole (BBH) mergers occurring within the disks of active galactic nuclei (AGN) are promising sources for gravitational waves detectable by the LIGO, Virgo, and KAGRA (LVK) interferometers. Some of these events have…

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