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Ryu, Dongsu
Astrophysics Lab
Research Interests
  • Shock waves and turbulence in clusters of galaxies

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Magnetic Fields, Relativistic Particles, and Shock Waves in Cluster Outskirts

Cited 22 times inthomson ciCited 13 times inthomson ci
Title
Magnetic Fields, Relativistic Particles, and Shock Waves in Cluster Outskirts
Author
Brueggen, MarcusBykov, AndreiRyu, DongsuRoettgering, Huub
Keywords
Cosmic rays; Galaxy clusters; Magnetic fields
Issue Date
201205
Publisher
SPRINGER
Citation
SPACE SCIENCE REVIEWS, v.166, no.1-4, pp.187 - 213
Abstract
It is only now, with low-frequency radio telescopes, long exposures with high-resolution X-ray satellites and γ-ray telescopes, that we are beginning to learn about the physics in the periphery of galaxy clusters. In the coming years, Sunyaev-Zel'dovich telescopes are going to deliver further great insights into the plasma physics of these special regions in the Universe. The last years have already shown tremendous progress with detections of shocks, estimates of magnetic field strengths and constraints on the particle acceleration efficiency. X-ray observations have revealed shock fronts in cluster outskirts which have allowed inferences about the microphysical structure of shocks fronts in such extreme environments. The best indications for magnetic fields and relativistic particles in cluster outskirts come from observations of so-called radio relics, which are megaparsec-sized regions of radio emission from the edges of galaxy clusters. As these are difficult to detect due to their low surface brightness, only few of these objects are known. But they have provided unprecedented evidence for the acceleration of relativistic particles at shock fronts and the existence of μG strength fields as far out as the virial radius of clusters. In this review we summarise the observational and theoretical state of our knowledge of magnetic fields, relativistic particles and shocks in cluster outskirts.
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DOI
http://dx.doi.org/10.1007/s11214-011-9785-9
ISSN
0038-6308
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