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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 10.
Comparison of redshift models between GWTC-3.0 and GWTC-4.0. Top: posterior on the κ parameter for the POWER LAW REDSHIFT model. GWTC-4.0 shows increased support for positive values. Bottom: median and 90% credible regions for the comoving source frame rate in the POWER LAW REDSHIFT model. We also show a comparison of the POWER LAW REDSHIFT model and the weakly modeled B-SPLINE model and a scaled cosmic star formation rate density (P. Madau & M. Dickinson 2014), which are consistent within uncertainties (κSFR = 2.7).
© 2026. The Author(s). Published by the American Astronomical Society.