{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"a33729aaeaad77bb809f30985d9caa46283f7db567d39306d0a81b2151af4ded","created":"2026-10-15T23:43:22Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["52d79ac04090d5db75042b6a453fa0624885f222dcb7d3932fecb8fca21bb09b","ce59fb6cd812fc05906d0c60a71c75ea22bc686bcf38e7c3ef7010834d98ee7b"],"salt":"2eac58caaa08f00e4a2b3c29bcdbcee42fcc57f5fba192bcc36c08a41f1db84d","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"identification","assisted_by":[],"external_id":"astro.cosmic-ray-origins.uhecr-sources","kind":"phenomenon","literature_status":"open","n":"2","parents":[],"plain":"The most energetic cosmic rays come from outside our galaxy, but magnetic fields bend their paths, so their sources have not been identified.","posed_since":"","precise":"For $E > 8 \\times 10^{18}\\ \\mathrm{eV}$ (Auger large-scale dipole, amplitude $\\sim 6.5\\%$, pointing away from the Galactic center) and $E > 4 \\times 10^{19}\\ \\mathrm{eV}$ (intermediate-scale excesses near Centaurus A and starburst galaxies for Auger, the hotspot for Telescope Array), identify the source population (AGN jets, starburst galaxies, gamma-ray bursts, tidal disruption events, magnetars). Answer: a source class whose emissivity, maximum rigidity and composition reproduce the spectrum, the shower-depth ($X_{\\max}$) distributions and the arrival-direction anisotropies after propagation through Galactic and extragalactic magnetic fields.","problem_ref":"52d79ac04090d5db75042b6a453fa0624885f222dcb7d3932fecb8fca21bb09b","references":"","settled_by":"Per-event mass estimates above $4 \\times 10^{19}\\,\\mathrm{eV}$ (AugerPrime) allowing light nuclei to be traced back, together with a $5\\sigma$ intermediate-scale anisotropy associated with a source catalog.","status_note":"2023: Telescope Array reported a $2.4 \\times 10^{20}\\ \\mathrm{eV}$ event (Amaterasu) whose arrival direction points toward the Local Void with no plausible nearby source.","title":"Which sources accelerate cosmic rays above 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