Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: High-energy neutrinos from radio galaxies   The IceCube experiment has recently reported the first observation of
high-energy cosmic neutrinos. Their origin is still unknown. In this paper, we
investigate the possibility that they originate in active galaxies. We show
that hadronic interactions (pp) in the generally less powerful, more frequent,
FR-I radio galaxies are one of the candidate source classes being able to
accommodate the observation while the more powerful, less frequent, class of
FR-II radio galaxies has too low of a column depths to explain the signal.

21
The categories of this paper are: adap-org
0
The categories of this paper are: hep-ph
13
The categories of this paper are: quant-ph
36
The categories of this paper are: cmp-lg
5
The categories of this paper are: gr-qc
23
The categories of this paper are: solv-int
30
The categories of this paper are: q-alg
11
The categories of this paper are: hep-lat
20
The categories of this paper are: acc-phys
27
The categories of this paper are: comp-gas
12
The categories of this paper are: nucl-th
28
The categories of this paper are: alg-geom
3
The categories of this paper are: physics
9
The categories of this paper are: nlin
33
The categories of this paper are: plasm-ph
29
The categories of this paper are: funct-an