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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 4.

The χ eff distribution as inferred by a BimodalGaussian effective spin model, defined as the sum of two Gaussians (see Appendix A). Solid blue lines denote the 90% credible intervals, while blue light curves are select individual draws from the posterior. For reference, the dashed black curve shows the mean χ eff distribution as inferred using a single Gaussian. Both results are consistent with one another, indicating no evidence for bimodal features, narrow or otherwise, in the binary black hole χ eff distribution.

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