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Caption: Figure 5.
Reconstructed posterior distributions for the parameters of the IGW (blue) and IGW+SMBHB (red) models. On the diagonal of the corner plot, we report the 1D marginalized distributions together with the 68% Bayesian credible intervals (vertical lines), while the off-diagonal panels show the 68% (darker) and 95% (lighter) Bayesian credible regions in the 2D posterior distributions. We construct all credible intervals and regions by integrating over the regions of highest posterior density. The gray shaded regions are strongly disfavored by the NG15 data, as they result in a K ratio of less than 1/10 (see Equation (10)). The black shaded region results in a violation of the N eff bound in Equation (23) (see Appendix C.1 and Figure 22), assuming N rh = 0 (solid line), N rh = 5 (dashed line), and N rh = 10 (dotted line). Figure 21 in Appendix C.1 shows an extended version of this plot that includes the SMBHB parameters A BHB and γ BHB.
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© 2023. The Author(s). Published by the American Astronomical Society.
