Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Gamma-ray and neutrino flares produced by protons accelerated on an
  accretion disk surface in AGN   We discuss the consequences of almost rectilinear acceleration of protons to
extremely high energies in a reconnection region on the surface of an accretion
disk which surrounds a central black hole in an active galaxy. The protons
produce $\gamma$-rays and neutrinos in interactions with the disk radiation as
considered in several previous papers. However, in this model the secondary
$\gamma$-rays can initiate cascades in the magnetic and radiation fields above
the disk. We compute the spectra of $\gamma$-rays and neutrinos emerging from
regions close to the disk surface. Depending on the parameters of the
reconnection regions, this model predicts the appearance of $\gamma$-ray and
neutrino flares if protons takes most of the energy from the reconnection
region. In contrast, if leptons take most of the energy, they produce pure
$\gamma$-ray flares. The $\gamma$-ray spectrum expected in the case of hadronic
cascading is compared with the spectrum observed during the flare in June 1991
from 3C 279. The neutrino flares which should accompany these gamma-ray flares
may be detected by future large scale neutrino telescopes sensitive at $\sim
10^{5}$ TeV.

20
The categories of this paper are: acc-phys
27
The categories of this paper are: comp-gas
13
The categories of this paper are: quant-ph
2
The categories of this paper are: math
12
The categories of this paper are: nucl-th
28
The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th
21
The categories of this paper are: adap-org
16
The categories of this paper are: stat
32
The categories of this paper are: atom-ph
11
The categories of this paper are: hep-lat
33
The categories of this paper are: plasm-ph
14
The categories of this paper are: math-ph
23
The categories of this paper are: solv-int
10
The categories of this paper are: q-bio
29
The categories of this paper are: funct-an