Статья

Hierarchical Black Hole Mergers in Active Galactic Nuclei

Yi YangDepartment of Physics, University of Florida, P.O. Box 118440, Gainesville, Forida 32611-8440, USAI. BartosDepartment of Physics, University of Florida, P.O. Box 118440, Gainesville, Forida 32611-8440, USAV. GayathriDepartment of Physics, University of Florida, P.O. Box 118440, Gainesville, Forida 32611-8440, USAK. E. Saavik FordDepartment of Astrophysics, American Museum of Natural History, Central Park West, New York, New York 10028, USAZoltán HaimanDepartment of Astronomy, Columbia University in the City of New York, 550 W 120th Street, New York, New York 10027, USAS. KlimenkoDepartment of Physics, University of Florida, P.O. Box 118440, Gainesville, Forida 32611-8440, USABence KocsisEötvös University, Institute of Physics, Pázmány P. s. 1/A, Budapest, 1117, HungarySzabolcs MárkaDepartment of Physics, Columbia University in the City of New York, 550 W 120th Street, New York, New York 10027, USAZ. MárkaColumbia Astrophysics Laboratory, Columbia University in the City of New York, 550 W 120th Street, New York, New York 10027, USABarry McKernanDepartment of Astrophysics, American Museum of Natural History, Central Park West, New York, New York 10028, USAR. O’ShaughnessyRochester Institute of Technology, Rochester, New York 14623, USA

2019en

ABI

Аннотация

The origins of the stellar-mass black hole mergers discovered by LIGO/Virgo are still unknown. Here we show that if migration traps develop in the accretion disks of active galactic nuclei (AGNs) and promote the mergers of their captive black holes, the majority of black holes within disks will undergo hierarchical mergers-with one of the black holes being the remnant of a previous merger. 40% of AGN-assisted mergers detected by LIGO/Virgo will include a black hole with mass ≳50M_{⊙}, the mass limit from stellar core collapse. Hierarchical mergers at traps in AGNs will exhibit black hole spins (anti)aligned with the binary's orbital axis, a distinct property from other hierarchical channels. Our results suggest, although not definitively (with odds ratio of ∼1), that LIGO's heaviest merger so far, GW170729, could have originated from this channel.

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Идентификаторы

DOI: 10.1103/physrevlett.123.181101

Цитирования и источники

Цитирований: 2Использованных источников: 0

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