A Seyfert galaxy as a hidden counterpart to a neutrino-associated blazar
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arXiv
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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866909978690846720 |
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| author | Kun, Emma del Palacio, Santiago Bartos, Imre Halzen, Francis Tjus, Julia Becker Biermann, Peter L. Franckowiak, Anna Ricci, Claudio |
| author_facet | Kun, Emma del Palacio, Santiago Bartos, Imre Halzen, Francis Tjus, Julia Becker Biermann, Peter L. Franckowiak, Anna Ricci, Claudio |
| contents | The origin and production mechanisms of high-energy astrophysical neutrinos remain open questions in multimessenger astronomy. Previous studies have hinted at a possible linear correlation between the hard X-ray and high-energy neutrino emission in active galactic nuclei. New \textit{NuSTAR} observations, first presented here, reveal that blazar PKS 1424+240, located within a prominent IceCube neutrino hotspot, is far fainter in hard X-rays than expected from this trend. Motivated by this apparent ambiguity, we identify the nearby Seyfert galaxy NGC 5610, also coincident with the hotspot, whose unabsorbed hard X-ray flux exceeds that of PKS 1424+240 by about an order of magnitude. When the local IceCube neutrino flux is apportioned between the two AGN in proportion to their hard X-ray emission, both align with the previously suggested X-ray-neutrino correlation. This suggests that certain IceCube hotspots may be unresolved blends of multiple AGN, and supports a multimessenger scenario in which high-energy neutrinos and hard X-rays originate from the same hadronic interactions, with the X-ray emission produced through cascade reprocessing. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_24178 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | A Seyfert galaxy as a hidden counterpart to a neutrino-associated blazar Kun, Emma del Palacio, Santiago Bartos, Imre Halzen, Francis Tjus, Julia Becker Biermann, Peter L. Franckowiak, Anna Ricci, Claudio High Energy Astrophysical Phenomena The origin and production mechanisms of high-energy astrophysical neutrinos remain open questions in multimessenger astronomy. Previous studies have hinted at a possible linear correlation between the hard X-ray and high-energy neutrino emission in active galactic nuclei. New \textit{NuSTAR} observations, first presented here, reveal that blazar PKS 1424+240, located within a prominent IceCube neutrino hotspot, is far fainter in hard X-rays than expected from this trend. Motivated by this apparent ambiguity, we identify the nearby Seyfert galaxy NGC 5610, also coincident with the hotspot, whose unabsorbed hard X-ray flux exceeds that of PKS 1424+240 by about an order of magnitude. When the local IceCube neutrino flux is apportioned between the two AGN in proportion to their hard X-ray emission, both align with the previously suggested X-ray-neutrino correlation. This suggests that certain IceCube hotspots may be unresolved blends of multiple AGN, and supports a multimessenger scenario in which high-energy neutrinos and hard X-rays originate from the same hadronic interactions, with the X-ray emission produced through cascade reprocessing. |
| title | A Seyfert galaxy as a hidden counterpart to a neutrino-associated blazar |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2512.24178 |