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Possible correlation between unabsorbed hard X-rays and neutrinos in radio-loud and radio-quiet AGN

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arxiv 2404.06867 v4 pith:GGJ2DW7E submitted 2024-04-10 astro-ph.HE

Emma Kun , Imre Bartos , Julia Becker Tjus , Peter L. Biermann , Anna Franckowiak , Francis Halzen , Santiago del Palacio , Jooyun Woo This is my paper · ORCID
classification astro-ph.HE
keywords neutrinoneutrinosfluxhardproductionblackgalaxiesgamma
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abstract

The first high-energy neutrino source identified by IceCube was a blazar -- an active galactic nucleus driving a relativistic jet towards Earth. Jets driven by accreting black holes are commonly assumed to be needed for high-energy neutrino production. Recently, IceCube discovered neutrinos from Seyfert galaxies, which appears unrelated to jet activity. Here, we show that the observed luminosity ratios of neutrinos and hard X-rays from blazars TXS 0506+056 and GB6 J1542+6129 are consistent with neutrino production in a $\gamma$-obscured region near a central supermassive black hole, with the X-ray flux corresponding to reprocessed $\gamma$-ray emission with flux comparable to that of neutrinos. Similar neutrino - hard X-ray flux ratios are found for four Seyfert galaxies, NGC 1068, NGC 4151, CGCG 420-015 and NGC 3079, raising the possibility of a common neutrino production mechanism that may not involve a strong jet.

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Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Interpreting Swift and NuSTAR Observations of the Low-Luminosity Active Galactic Nucleus NGC 4278 with Radiatively Inefficient Accretion Flows and Implications for Neutrino Emission

    astro-ph.HE 2026-03 conditional novelty 6.0 of 10

    First NuSTAR hard X-ray spectra of NGC 4278 are matched by a radiatively inefficient accretion flow with a variable accretion rate, while TeV gamma rays are argued to originate outside the inner flow.

  2. Bayesian Deep-stacking for High-energy Neutrino Searches

    astro-ph.HE 2025-02 conditional novelty 6.0 of 10

    A hierarchical Bayesian stacking framework improves sensitivity for detecting faint high-energy neutrino source populations when per-source flux predictions are uncertain.

  3. On the Blueprint of Active Galaxies Producing Neutrinos

    astro-ph.HE 2026-07 conditional novelty 4.0 of 10

    Neutrinos from active galaxies are produced in compact X-ray-bright coronae within about ten Schwarzschild radii of the black hole, and such sources may supply the diffuse neutrino flux.

  4. Active Galactic Nuclei as high-energy neutrino sources

    astro-ph.HE 2026-06 unverdicted novelty 2.5 of 10

    Review summarizing correlations between astrophysical neutrinos and gamma-ray/radio AGN, specific source associations, proposed production mechanisms, and future prospects.

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