Title:	Cosmic Clues from Amaterasu: Blazar-driven Ultrahigh-energy Cosmic Rays?
Authors:	Das, Saikat Hazra, Srijita Gupta, Nayantara
Keywords:	High energy astrophysics Active galactic nuclei Gamma-ray astronomy Ultra-high-energy cosmic radiation Neutrino astronomy Blazars
Issue Date:	20-Jul-2025
Publisher:	IOP Publishing Ltd
Citation:	The Astrophysical Journal Letters, 2025, Vol. 988, L8
Abstract:	The 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.
Description:	Open Access
URI:	http://hdl.handle.net/2289/8415
Alternative Location:	https://ui.adsabs.harvard.edu/abs/2025ApJ...988L...8D/abstract https://arxiv.org/abs/2504.16019 https://inspirehep.net/literature/2915053 https://doi.org/10.3847/2041-8213/ade99f
Copyright:	2025 The Author(s)
Appears in Collections:	Research Papers (A&A)

Items in RRI Digital Repository are protected by copyright, with all rights reserved, unless otherwise indicated.