The Steep Redshift Evolution of the Hierarchical Binary Black Hole Merger Rate May Cause the z - χ eff Correlation
A. M. Farah; A. Vijaykumar; M. Fishbach · 2026 · The Astrophysical Journal Letters
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Abstract
Abstract There is growing evidence from gravitational-wave (GW) observations that some merging black holes (BHs) are created from previous mergers. Using the prediction that these hierarchically merged BHs have dimensionless spin magnitudes of χ ≈ 0.69, we identify a subpopulation in the GW data consistent with a hierarchical-merger origin in dense star clusters. This subpopulation’s primary mass distribution peaks at 17 . 0 − 4.4 + 18.3 M ⊙ , which is approximately twice as large as its secondary mass distribution’s mode ( 10 . 5 − 4.7 + 29.7 M ⊙ ), and its spin tilt distribution is consisten
Abstract by A. M. Farah; A. Vijaykumar; M. Fishbach, The Astrophysical Journal Letters (2026) — licensed CC BY 4.0.
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Metadata source: OpenAlex · DOI 10.3847/2041-8213/ae4e19