Escape-limited maximum energy at perpendicular shocks in the interstellar magnetic field

Discussion timeslot (ZOOM-Meeting): 16. July 2021 - 12:00
ZOOM-Meeting URL: https://desy.zoom.us/j/92210078166
ZOOM-Meeting ID: 92210078166
ZOOM-Meeting Passcode: ICRC2021
Corresponding Session: https://icrc2021-venue.desy.de/channel/12-Galactic-Particle-Acceleration-including-PIC-CRI-CRD-MM/127
Live-Stream URL: https://icrc2021-venue.desy.de/livestream/Discussion-03/4

Abstract:
'The origin of cosmic rays is still a long-standing problem in astrophysics. Supernova remnants are plausible candidates of cosmic rays up to 10^15.5 eV. For cosmic ray nuclei, the maximum energy is limited by the escape from accelerators. In previous studies about the cosmic-ray escape, the diffusion approximation is assumed. However, the diffusion approximation cannot apply to investigate the escape process from a perpendicular shock region because the gyration can be important for a perpendicular shock acceleration. It is suggested that the diffusive shock acceleration at a perpendicular shock is a potential acceleration mechanism to accelerate particles up to PeV scale without the magnetic field amplification in the upstream region. However, the escape process and the escape-limited maximum energy at perpendicular shocks are still unknown. In this study, we investigate the escape process from a perpendicular shock region of supernova remnants in the interstellar magnetic field by using a test particle simulation. In this talk, we will report results about the escape process and the escape-limited maximum energy at a perpendicular shock region of supernova remnants in the interstellar magnetic field.'

Authors: Shoma Kamijima
Co-Authors: Yutaka Ohira
Indico-ID: 147
Proceeding URL: https://pos.sissa.it/395/146