Cross-catalog offsets in black hole mass proxies shift the predicted nHz gravitational wave background by factors comparable to PTA uncertainties; matching the observed amplitude requires a selection effect of about one sigma of the intrinsic scatter.
The Masses of Nuclear Black Holes in Luminous Elliptical Galaxies and Implications for the Space Density of the Most Massive Black Holes,
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Uncertainties in the supermassive black hole abundance and implications for the GW background
Cross-catalog offsets in black hole mass proxies shift the predicted nHz gravitational wave background by factors comparable to PTA uncertainties; matching the observed amplitude requires a selection effect of about one sigma of the intrinsic scatter.