SMuK 2023 – wissenschaftliches Programm

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EP: Fachverband Extraterrestrische Physik

EP 9: Poster

EP 9.4: Poster

Mittwoch, 22. März 2023, 17:30–19:00, HSZ OG1

Analytic solutions for the hadronic time-dependent two-zone blazar model — •Vito Aberham and Felix Spanier — Institut für Theoretische Astrophysik (ITA), Albert-Ueberle-Str. 2, 69120 Heidelberg

Active galactic nuclei's (AGN) distinct variability is examined analytically by applying an evolving two-zone model to their jets. It is focused on hybrid jets containing both electrons and protons, since they allow for the additional emission of neutrinos. The dominant source of variability, jets of AGN are characterized by the cooling process mainly driving the emergence of the spectral energy distribution's high-energy peak. A scenario comprising blazars with proton synchrotron radiation as the predominant emission mechanism for high energies, while, as usual, electron synchrotron radiation drives the low energy emission, is chosen here. Dominant emission due to cascades is among cases considered in upcoming works. Incorporating both their acceleration and cooling in the respective zones, the particle distributions are calculated by solving two coupled partial differential equations while the effect of second-order Fermi acceleration is neglected. The associated photon density is obtained, which, combined with the proton distribution, eventually yields the emerging neutrino flux. Both the according light curves and neutrino fluxes in specific energy bands are ultimately inferred, enabling comparisons to observed blazars. Ultimately, a tool, which simulates a blazar's flare by exploiting the analytical results' dependence on the set of free model parameters, is presented to very quickly cross-check numerical simulations at low computational cost.