Revealing the χ eff–q Correlation among Coalescing Binary Black Holes and Tentative Evidence for AGN-driven Hierarchical Mergers
Yin-Jie Li; Yuan-Zhu Wang; Shao-Peng Tang; Tong 彤 Chen 陈; Yi-Zhong Fan · 2025 · The Astrophysical Journal
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Abstract
Abstract The origin of the correlation between the effective spins ( χ eff ) and mass ratios ( q ) of LIGO–Virgo–KAGRA’s binary black holes (BBHs) is still an open question. Motivated by the recent identification of two subpopulations of the BBHs, in this work we investigate the potential χ eff – q correlation for each subpopulation. Surprisingly, the χ eff – q correlation either significantly weakens or disappears for the low-mass subpopulation if we introduce a second χ eff distribution for the high-mass subpopulation, which likely originates from hierarchical mergers. This suggests that the
Abstract by Yin-Jie Li; Yuan-Zhu Wang; Shao-Peng Tang; Tong 彤 Chen 陈; Yi-Zhong Fan, The Astrophysical Journal (2025) — licensed CC BY 4.0.
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Metadata source: OpenAlex · DOI 10.3847/1538-4357/add535