Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Comments to the review "Nonthermal phenomena in clusters of galaxies" by
  Y.Rephaeli et al. that will appear on the book: Clusters of galaxies: beyond
  the thermal view   Comments to the review "Nonthermal Phenomena in Clusters of Galaxies" by
Y.Rephaeli et al. (arXiv:0801.0982 [astro-ph]) that regard the presence of a
hard X-ray excess in the Coma cluster, A2199, A2163 and the Bullet cluster.

13
The categories of this paper are: quant-ph
14
The categories of this paper are: math-ph
15
The categories of this paper are: nucl-ex
3
The categories of this paper are: physics
30
The categories of this paper are: q-alg
34
The categories of this paper are: chem-ph
4
The categories of this paper are: cond-mat
10
The categories of this paper are: q-bio
23
The categories of this paper are: solv-int
32
The categories of this paper are: atom-ph
11
The categories of this paper are: hep-lat
26
The categories of this paper are: bayes-an
25
The categories of this paper are: patt-sol
17
The categories of this paper are: q-fin
0
The categories of this paper are: hep-ph
7
The categories of this paper are: hep-th