Image Details
GWTC-4.0: Constraints on the Cosmic Expansion Rate and Modified Gravitational-wave Propagation
A. G. Abac et al 2026 The Astrophysical Journal Letters 1007 .
Caption: Figure 10.
Robustness checks against various systematics discussed in Section 4, compared to the fiducial results (ΛCDM, FULLPOP-4.0, and luminosity-weighting case for the dark sirens case). The box-plots show the median value as a vertical segment. The colored boxes stretch to the 68.3% CI, while the whiskers extend to encompass the 90% CI. The labels indicate variations with respect to the fiducial results. The posteriors shown in this plot do not include bounds from GW170817. In the analyses with varying Ωm and w0, the priors used are U(0, 1) and U(−3, 0), respectively. All displayed checks were generated exclusively using icarogw, and not by merging posterior samples from both pipelines, as done for the main results.
© 2026. The Author(s). Published by the American Astronomical Society.