Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Fueling lobes of radio galaxies: statistical particle acceleration and
  the extragalactic gamma-ray background   The recent discovery of the gamma-ray emission from the lobes of the closest
radio galaxy Centaurus A by Fermi implies the presence of high-energy electrons
at least up to gamma ~ 10^5 - 10^6. These high-energy electrons are required to
interpret the observed gamma-ray radiation in terms of inverse Compton emission
off the cosmic microwave background (IC/CMB); the widely accepted scenario to
describe the X-ray emission of radio galaxy lobes. In this Letter, we consider
the giant radio lobes of FR II radio galaxies showing that it is possible to
maintain electrons at energies gamma ~ 10^5 - 10^6, assuming an acceleration
scenario (driven by turbulent magnetic fields) that compensates the radiative
losses. In addition, we consider the contribution to the diffuse extragalactic
gamma-ray background due to the IC/CMB emission of FR IIs' lobes showing its
relevance in the keV to MeV energy range.

33
The categories of this paper are: plasm-ph
3
The categories of this paper are: physics
22
The categories of this paper are: chao-dyn
11
The categories of this paper are: hep-lat
0
The categories of this paper are: hep-ph
21
The categories of this paper are: adap-org
15
The categories of this paper are: nucl-ex
18
The categories of this paper are: econ
28
The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th
27
The categories of this paper are: comp-gas
7
The categories of this paper are: hep-th
4
The categories of this paper are: cond-mat
34
The categories of this paper are: chem-ph
37
The categories of this paper are: supr-con
2
The categories of this paper are: math