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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 2.

Marginal posterior distribution for χ eff using results from Abbott et al. (2021b) that have no excess of zero-spin events (blue) and results from Galaudage et al. (2021) that imply that ∼50% of binaries have zero spins (red). The solid lines trace the mean distribution inferred by each model while shaded regions denote the 90% credible regions; the light traces trace individual draws from the population posterior under each model. We see that, if a significant fraction of binary black holes are indeed nonspinning, this should be clearly identifiable through their χ eff distribution. This figure is modeled after Figure 5 of Galaudage et al. (2021).