Correlation Between X-Ray and Cosmic Neutrino Sources: From Obscured AGN to Blazars
Fuente:
arXiv
Salvato in:
| Autori principali: | , , , , , , , |
|---|---|
| Natura: | Preprint |
| Pubblicazione: |
2026
|
| Soggetti: | |
| Accesso online: | |
| Tags: |
Aggiungi Tag
Nessun Tag, puoi essere il primo ad aggiungerne!!
|
| _version_ | 1866917497188384768 |
|---|---|
| author | Kun, Emma Bartos, Imre Ricci, Claudio del Palacio, Santiago Halzen, Francis Tjus, Julia Becker Biermann, Peter L. Franckowiak, Anna |
| author_facet | Kun, Emma Bartos, Imre Ricci, Claudio del Palacio, Santiago Halzen, Francis Tjus, Julia Becker Biermann, Peter L. Franckowiak, Anna |
| contents | The origin of high-energy astrophysical neutrinos remains a key open question in multimessenger astrophysics. A correlation between unabsorbed hard X-ray emission and high-energy neutrino luminosity has been reported in a sample of six active galactic nuclei with the highest individual IceCube significances, linking neutrino production to compact, photon-rich environments near supermassive black holes. In this work we study whether the threshold-near IceCube excesses associated with seven NuSTAR-observed blazars are statistically consistent with that established relation. Calibrating the relation between the neutrino and hard X-ray luminosities as $\log L_ν= α+ β\log L_\mathrm{hX} + \mathcal{N}(0, σ_{\rm int}^2)$ on the six published sources via a Bayesian regression with errors on both axes, the recovered 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 best-fit neutrino numbers $\hat{n}_s$ values reflect the signal. A null-injection test confirms that, given the present calibration sample size, the consistency test does not by itself adjudicate between signal and selected-background origins. A distance-free $L_\mathrm{hX}/L_ν$ ratio diagnostic places both populations within the photohadronic prediction band, statistically indistinguishable. A flux-space permutation test on the 13-source joint sample, with construction-controlled $d_L^{\,2}$ distance bias, rejects random pairing $L_\mathrm{hX}$--$L_ν$ with $p = 6.3 \times 10^{-4}$ ($3.23\,σ$). 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_15360 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Correlation Between X-Ray and Cosmic Neutrino Sources: From Obscured AGN to Blazars Kun, Emma Bartos, Imre Ricci, Claudio del Palacio, Santiago Halzen, Francis Tjus, Julia Becker Biermann, Peter L. Franckowiak, Anna High Energy Astrophysical Phenomena The origin of high-energy astrophysical neutrinos remains a key open question in multimessenger astrophysics. A correlation between unabsorbed hard X-ray emission and high-energy neutrino luminosity has been reported in a sample of six active galactic nuclei with the highest individual IceCube significances, linking neutrino production to compact, photon-rich environments near supermassive black holes. In this work we study whether the threshold-near IceCube excesses associated with seven NuSTAR-observed blazars are statistically consistent with that established relation. Calibrating the relation between the neutrino and hard X-ray luminosities as $\log L_ν= α+ β\log L_\mathrm{hX} + \mathcal{N}(0, σ_{\rm int}^2)$ on the six published sources via a Bayesian regression with errors on both axes, the recovered 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 best-fit neutrino numbers $\hat{n}_s$ values reflect the signal. A null-injection test confirms that, given the present calibration sample size, the consistency test does not by itself adjudicate between signal and selected-background origins. A distance-free $L_\mathrm{hX}/L_ν$ ratio diagnostic places both populations within the photohadronic prediction band, statistically indistinguishable. A flux-space permutation test on the 13-source joint sample, with construction-controlled $d_L^{\,2}$ distance bias, rejects random pairing $L_\mathrm{hX}$--$L_ν$ with $p = 6.3 \times 10^{-4}$ ($3.23\,σ$). 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. |
| title | Correlation Between X-Ray and Cosmic Neutrino Sources: From Obscured AGN to Blazars |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2605.15360 |