Limiting the shock acceleration of cosmic ray protons in the ICM. (20th April 2020)

• Record Type: Journal Article
• Authors: Wittor, D; Vazza, F; Ryu, D; Kang, H
• Is Part Of: Monthly notices of the Royal Astronomical Society. Volume 495:Number 1(2020)
• Page Start: L112
• Page End: L117
• Publication Date: 2020-04-20
• Subjects: acceleration of particles -- MHD -- shock waves -- galaxies: clusters: intracluster medium -- gamma-rays: galaxies: clusters; Astronomy -- Research -- Periodicals; Periodicals; 520.5
• DOI: 10.1093/mnrasl/slaa066
• Languages: English
• ISSNs: 1745-3933

Abstract

ABSTRACT: Observations of large-scale radio emissions prove the existence of shock accelerated cosmic ray electrons in galaxy clusters, while the lack of detected γ-rays limits the acceleration of cosmic ray protons in galaxy clusters. This challenges our understanding of how diffusive shock acceleration works. In this work, we couple the most updated recipes for shock acceleration in the intracluster medium to state-of-the-art magnetohydrodynamical simulations of massive galaxy clusters. Furthermore, we use passive tracer particles to follow the evolution of accelerated cosmic rays. We show that when the interplay between magnetic field topology and the feedback from accelerated cosmic rays is taken into account, the latest developments of particle acceleration theory give results that are compatible with observational constraints.