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 3.
Top panel: completeness fraction of GLADE+ in the K band, indicating the probability that the catalog contains the host galaxy of a GW event, as a function of redshift for H0 = 67.9 km s−1 Mpc−1 and Ωm = 0.3065. The different curves are calculated for a given percentage of sky coverage computed by dividing the sky in equally sized pixels of 3.35 deg2, for which the apparent magnitude threshold is brighter than the corresponding mthr value reported in the legend. The fraction of pixels with no galaxies is ∼5%. Bottom panel: skymap showing the GLADE+ K-band apparent magnitude threshold, mthr, generated by dividing the sky into 3.35 deg2 pixels. A mask is applied that removes all pixels (white region) with mthr < 12.5 in order to improve the figure readability. Also shown are the 90% CR sky localizations for the 10 best-localized O4a GW events included in our analysis.
© 2026. The Author(s). Published by the American Astronomical Society.