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Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/8415
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dc.contributor.authorDas, Saikat-
dc.contributor.authorHazra, Srijita-
dc.contributor.authorGupta, Nayantara-
dc.date.accessioned2025-07-31T05:53:21Z-
dc.date.available2025-07-31T05:53:21Z-
dc.date.issued2025-07-20-
dc.identifier.citationThe Astrophysical Journal Letters, 2025, Vol. 988, L8en_US
dc.identifier.urihttp://hdl.handle.net/2289/8415-
dc.descriptionOpen Accessen_US
dc.description.abstractThe detection of the Amaterasu event of energy 244 EeV by the Telescope Array, one of the most energetic ultrahigh-energy cosmic rays (UHECRs; E ≳ 0.1 EeV) observed to date, invites scrutiny of its potential source. We investigate whether the nearby blazar PKS 1717+177 at redshift z = 0.137, located within of the reconstructed arrival direction, could explain the event under a proton-primary hypothesis. Using a one-zone jet model, we fit the multiwavelength spectral energy distribution of the source, incorporating both leptonic and hadronic cascade emissions from photohadronic interactions inside the jet. Our model supports a cosmic-ray origin of the very-high-energy (εγ ≳ 100 GeV) γ-ray flux and predicts a subdominant neutrino flux, 1 one order of magnitude lower than from TXS 0506+056. Under Lorentz invariance violation, UHECRs escaping the blazar jet above a specific energy can propagate unattenuated over hundreds of Mpc due to an increase in energy loss length for certain parameter choices. In such a scenario, the Amaterasu event can have a plausible origin from this blazar. Our analysis indicates negligible deflection in the Galactic magnetic field, implying a strong extragalactic magnetic field is required. Our findings provide a compelling multimessenger framework linking UHECRs, γ-rays, and neutrinos and motivate targeted searches by current and future high-energy neutrino telescopes during increased γ-ray or X-ray activity of this blazar.en_US
dc.language.isoenen_US
dc.publisherIOP Publishing Ltden_US
dc.relation.urihttps://ui.adsabs.harvard.edu/abs/2025ApJ...988L...8D/abstracten_US
dc.relation.urihttps://arxiv.org/abs/2504.16019en_US
dc.relation.urihttps://inspirehep.net/literature/2915053en_US
dc.relation.urihttps://doi.org/10.3847/2041-8213/ade99fen_US
dc.rights2025 The Author(s)en_US
dc.subjectHigh energy astrophysicsen_US
dc.subjectActive galactic nucleien_US
dc.subjectGamma-ray astronomyen_US
dc.subjectUltra-high-energy cosmic radiationen_US
dc.subjectNeutrino astronomyen_US
dc.subjectBlazarsen_US
dc.titleCosmic Clues from Amaterasu: Blazar-driven Ultrahigh-energy Cosmic Rays?en_US
dc.typeArticleen_US
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