期刊
ASTROPHYSICAL JOURNAL
卷 771, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/771/2/131
关键词
acceleration of particles; galaxies: clusters: intracluster medium; turbulence
资金
- Humboldt Fellowship at the Ruhr-Universitat Bochum
- Los Alamos Director's Fellowship
- LDRD program at LANL
- IGPP program at LANL
- DOE/Office of Fusion Energy Science through CMSO
- Deutsche Forschungsgemeinschaft [Schl 201/25-1]
- Division Of Physics
- Direct For Mathematical & Physical Scien [821899] Funding Source: National Science Foundation
Cosmological MHD simulations of galaxy cluster formation show a significant amplification of seed magnetic fields. We developed a novel method to decompose cluster magnetized turbulence into modes and showed that the fraction of the fast mode is fairly large, around one-fourth in terms of energy. This is larger than that was estimated before, which implies that cluster turbulence interacts with cosmic rays rather efficiently. We propose a framework to deal with electron and proton reacceleration in galaxy clusters that includes feedback on turbulence. In particular, we establish a new upper limit on proton and electron fluxes based on turbulence intensity. These findings, along with detailed modeling of reacceleration, will help to reconcile the observed giant radio halos and the unobserved diffuse gamma-ray emission from these clusters.
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