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No Evidence that the Majority of Black Holes in Binaries Have Zero Spin

  • Authors: Thomas A. Callister, Simona J. Miller, Katerina Chatziioannou, Will M. Farr

Thomas A. Callister et al 2022 The Astrophysical Journal Letters 937 .

  • Provider: AAS Journals

Caption: Figure 12.

Validation of the KDE likelihood approach discussed in Appendix E. Each subplot shows the marginalized posterior for the fraction of events contained within a narrow spike at χ eff = 0. Solid lines show posteriors computed using the KDE method, while dashed lines show posteriors obtained using ordinary Monte Carlo averaging (Appendix B). Results are shown for a variety of spike widths, from broad spikes with standard deviation ϵ = 0.03 to narrow spikes with ϵ = 10−4. We see that the KDE method yields consistent and convergent results as ϵ approaches zero, while the Monte Carlo averaging gives increasingly divergent results for small spike widths due to growing Monte Carlo errors.

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