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GWTC-4.0: Population Properties of Merging Compact Binaries
A. G. Abac et al 2026 The Astrophysical Journal Letters 1005 .
Caption: Figure 18.
Posterior for the GAUSSIAN EFFECTIVE SPINS model hyperparameters, as defined in Table 9, for GWTC-4.0 under two methods of cutting out samples that may lead to an unconverged likelihood. Posteriors excluding samples with a substantially large log-likelhood variance (﹩{\sigma }_{{\mathrm{ln}}\hat{{ \mathcal L }}}^{2}﹩ cut) are shown in purple; those excluding samples with a substantially small number of effective samples (Neff cut) are in green. In black are the GWTC-3.0 results with the Neff cut for comparison. The χeff hyperparameters are not affected by the cuts, while the χp and joint-distribution hyperparameters are. The contours of the two-dimensional distributions mark the 50th and 90th percentiles.
© 2026. The Author(s). Published by the American Astronomical Society.