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Astrophysics > High Energy Astrophysical Phenomena

arXiv:2108.01870 (astro-ph)
[Submitted on 4 Aug 2021]

Title:Particle acceleration at the termination shock of stellar clusters' wind

Authors:Giovanni Morlino
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Abstract:We investigate the process of particle acceleration at the termination shock that develops in the bubble excavated by winds of star clusters in the interstellar medium. We develop a theory of diffusive shock acceleration at such shock and we find that the maximum energy may reach the PeV region for very powerful clusters. We show how the maximum energy is limited by two different processes: the particle escape from the bubble boundary and the drop of energy gain for particles able to diffuse up to the center of the cluster. A crucial role in this problem is played by the dissipation of kinetic energy of the wind to magnetic perturbations which determines the diffusion regime of particles: in case the diffusion is close to Bohm than PeV energies can be reached.
Comments: Proceeding of the 37th International Cosmic Ray Conference (ICRC2021)
Subjects: High Energy Astrophysical Phenomena (astro-ph.HE)
Report number: https://pos.sissa.it/395/444
Cite as: arXiv:2108.01870 [astro-ph.HE]
  (or arXiv:2108.01870v1 [astro-ph.HE] for this version)
  https://doi.org/10.48550/arXiv.2108.01870
Related DOI: https://doi.org/10.22323/1.395.0444

Submission history

From: Giovanni Morlino Dr. [view email]
[v1] Wed, 4 Aug 2021 06:54:09 UTC (2,816 KB)
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