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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 12.
Mass ratio and χeff PPDs for the COPULA model (blue) and LINEAR model (orange). The contours, from dark to light, mark 50%, 90%, and 99% of the volume. We see a subtle preference for an anticorrelation, although this feature is far less prevalent than it appeared in GWTC-3.0. We also see evidence for a broadening in the distribution as mass ratios become more unequal in the LINEAR model. The COPULA model is not flexible in a way that it can capture a broadening.
© 2026. The Author(s). Published by the American Astronomical Society.