Kavli Affiliate: Claudio Ricci
| Summary:
The origin of high-energy astrophysical neutrinos remains a key open question in multimessenger astrophysics. A correlation between unabsorbed hard X-ray and high-energy neutrino luminosity has been reported in six active galactic nuclei with the highest individual IceCube significances, linking neutrino production to compact, photon-rich environments near supermassive black holes. We study whether the threshold-near IceCube excesses associated with seven NuSTAR-observed blazars are statistically consistent with that relation. Calibrating the $L_mathrmhX$-$L_ν$ relation on the six published sources via a Bayesian regression with errors on both axes, the slope is consistent with $β= 1$ and the intrinsic scatter is $sim 0.6$,dex. All seven new blazars are posterior-predictively consistent with this calibration ($χ^2_7 = 1.58$, $p = 0.98$) under the working hypothesis that the published IceCube $hatn_s$ values reflect the signal. A null-injection test confirms that, at the present calibration sample size, the consistency test does not by itself adjudicate between signal and selected-background origins. A distance-free $L_mathrmhX/L_ν$ ratio diagnostic places both populations within the photohadronic prediction band, statistically indistinguishable. Two diagnostics that control the common $d_L^,2$ distance bias, a redshift-partial rank correlation ($τ|z = 0.69$, $sim!2.7,σ$) and a flux-space permutation test on the 13-source joint sample ($p = 6.3times10^-4$, $3.23,σ$), indicate a residual $L_mathrmhX$-$L_ν$ association beyond the distance-induced trend. We interpret these results as a conditional consistency check; a detection-level statement requires either an enlarged calibration set or an X-ray-weighted IceCube stacking likelihood with internal data.
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