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.
Selection bias in dynamically measured supermassive black hole samples: its consequences and the quest for the most fundamental relation,
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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.