Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Diagnostic Signatures of Radio and HXR Emission on Particle Acceleration
  Processes in the Coma Cluster   We investigate theoretical models for the radio halo and hard X-ray (HXR)
excess in the Coma galaxy cluster. Time-independent and time-dependent
re-acceleration models for relativistic electrons have been carried out to
study the formation of the radio halo and HXR excess. In these models, the
relativistic electrons are injected by merger shocks and re-accelerated by
ensuing violent turbulence. The effects of different Mach numbers of the merger
shocks on the radio and HXR excess emission are also investigated. We adopt 6
$\mu$G as the central magnetic field and reproduce the observed radio spectra
via the synchrotron emission. We also obtain a central "plateau" in the radio
spectral-index distribution, which have been observed in radio emission
distribution. Our models can also produce the observed HXR excess emission via
the inverse Compton scattering of the cosmic microwave background photons. We
find that only the merger shocks with the Mach numbers around 1.6--2 can
produce results in agreement with both the radio and HXR emission in the Coma
cluster.

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The categories of this paper are: dg-ga
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The categories of this paper are: q-fin
36
The categories of this paper are: cmp-lg
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The categories of this paper are: hep-lat
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The categories of this paper are: q-bio
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The categories of this paper are: nlin
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The categories of this paper are: solv-int
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The categories of this paper are: econ
1
The categories of this paper are: cs
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The categories of this paper are: alg-geom
2
The categories of this paper are: math
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The categories of this paper are: plasm-ph
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The categories of this paper are: supr-con
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The categories of this paper are: stat
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The categories of this paper are: math-ph
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The categories of this paper are: quant-ph