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- W4387156781 abstract "Merging black holes (BH) are expected to produce remnants with large dimensionless spin parameters ($a_{rm spin} sim 0.7$). However, gravitational wave (GW) observations with LIGO/Virgo suggest that merging BH are consistent with modestly positive but not high spin ($a_{rm spin} sim 0.2$), causing tension with models suggesting that high mass mergers are produced by hierarchical merger channels. Some BH also show evidence for strong in-plane spin components. Here we point out that emph{spin down} of BH due to eccentric prograde post-merger orbits within the gas of an active galactic nucleus (AGN) disk can yield BH with masses in the upper mass gap, but only modestly positive $a_{rm spin}$, and thus observations of BH with low spin emph{do not} rule out hierarchical models. We also point out that the fraction of BBH mergers with significant in-plane spin components is a strong test of interactions between disk binary black holes (BBH) and nuclear spheroid orbiters. Spin magnitude and spin tilt constraints from LIGO/Virgo observations of BBH are an excellent test of dynamics of black holes in AGN disks, disk properties and the nuclear clusters interacting with AGN." @default.
- W4387156781 created "2023-09-30" @default.
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- W4387156781 date "2023-09-26" @default.
- W4387156781 modified "2023-09-30" @default.
- W4387156781 title "Constraining the LIGO/Virgo AGN channel with black hole spins" @default.
- W4387156781 doi "https://doi.org/10.48550/arxiv.2309.15213" @default.
- W4387156781 hasPublicationYear "2023" @default.
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