Cosmic-ray transport in blazars: diffusive or ballistic propagation?

Discussion timeslot (ZOOM-Meeting): 16. July 2021 - 18:00
ZOOM-Meeting URL: https://icrc2021.desy.de/pf_access_abstracts
Corresponding Session: https://icrc2021-venue.desy.de/channel/Presenter-Forum-1-Evening-All-Categories/48
Abstract:
'The detection of a PeV high-energy neutrino of astrophysical origin, observed by the IceCube Collaboration and correlated with a 3$sigma$ significance with Fermi measurements to the gamma-ray blazar TXS 0506+056, further stimulated the discussion on the production channels of high-energy particles in blazars. Many models also consider a hadronic component that would not only contribute to the emission of electromagnetic radiation in blazars but also lead to the production of secondary high-energy neutrinos and gamma rays. rnrnRelativistic and compact plasma structures, so-called plasmoids, have been discussed in such flares to be moving along the jet axis. The frequently used assumption in such models that diffusive transport can describe particles in jet plasmoids is investigated in the present contribution. While there is scientific consensus that the transport of particles in turbulent fields is diffusive in the limit of infinitely large times, the question arises under which conditions and on which time scale such a limit consideration is appropriate. rnrnWe present conditions based on analytical calculations that determine the time scale to reach the diffusion phase as a function of the model parameters in the jet.rnWe show that the type of the charged-particle transport, diffusive or ballistic, has a large influence on many observable parameters, including the spectrum of high-energy particles.'

Authors: Julia Becker Tjus | Marcel Schroller | Mario Hörbe | Fabian Schussler | Wolfgang Rhode | Ilja Jaroschewski | Patrick Reichherzer
Indico-ID: 641
Proceeding URL: https://pos.sissa.it/395/468