PoS - Proceedings of Science
Volume 395 - 37th International Cosmic Ray Conference (ICRC2021) - CRI - Cosmic Ray Indirect
Ultra-High-Energy Cosmic Rays and Neutrinos from relativistic jets of Active Galactic Nuclei
R. Mbarek*, D. Caprioli and K. Murase
Full text: pdf
Pre-published on: July 08, 2021
Published on: March 18, 2022
In Mbarek & Caprioli (2019), we laid the groundwork for studying the espresso paradigm (Caprioli 2015), a reacceleration mechanism to boost galactic CRs to UHECR levels.
Our bottom-up approach uses realistic 3D MHD simulations of relativistic AGN jets and accounts for all of the crucial ingredients of a universal acceleration theory: injection, acceleration, and escape in realistic environments. Our results are consistent with the main features of UHECR spectra, i.e., power-law slopes, chemical composition, and anisotropy.
In Mbarek & Caprioli (2021), we refine our model by including sub-grid particle scattering to model small-scale magnetic turbulence that cannot be resolved by MHD simulations, constraining for the first time one crucial but hard-to-model ingredient, and allowing us to establish the relative importance of espresso and stochastic shear acceleration in relativistic jets. Our framework also enables us to analyze high-energy neutrinos produced from our accelerated UHECRs considering the effects of external photon fields, and to incorporate nucleus photodisintegration. The spectra we obtain are consistent with the picture drawn by observations with Auger, Telescope Array, and IceCube observatory.
DOI: https://doi.org/10.22323/1.395.0481
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