Papers › McFACTS II: Mass Ratio--Effective Spin Relationship of Black Hole Mergers in the AGN Channel
McFACTS II: Mass Ratio--Effective Spin Relationship of Black Hole Mergers in the AGN Channel
Harrison E. Cook, Barry McKernan, K. E. Saavik Ford, Vera Delfavero, Kaila Nathaniel, Jake Postiglione, Shawn Ray, Emily J. McPike, Richard O'Shaughnessy
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We use the Monte Carlo For AGN (active galactic nucleus) Channel Testing and Simulation (McFACTS, https://www.github.com/mcfacts/mcfacts) code to study the effect of AGN disk and nuclear star cluster parameters on predicted mass distributions for LIGO-Virgo-KAGRA (LVK) compact binaries forming in AGN disks. The assumptions we vary include the black hole (BH) initial mass function, disk model, disk size, disk lifetime, and the prograde-to-retrograde fraction of newly formed black hole binaries. Broadly we find that dense, moderately short-lived AGN disks are preferred for producing a (q,χ_(eff)) anti-correlation like those identified from existing gravitational wave (GW) observations. Additionally, a BH initial mass function (MF ∝M⁻²) is preferred over a more top-heavy MF (M⁻¹). The preferred fraction of prograde-to-retrograde is >90%, to produce results consistent with observations.
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