Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Numerical modelling of gamma-ray emission produced by electrons
  originating from the magnetospheres of millisecond pulsars in globular
  clusters   Globular clusters are source of gamma-ray radiation. At GeV energies, their
emission is attributed to magnetospheric activity of millisecond pulsars
residing in the clusters. Inverse Compton scattering of ambient photon fields
on relativistic particles diffusing through cluster environment is thought to
be the source of GeV-TeV emission of globular clusters. Using pair starved
polar cap model gamma-ray emission from synthetic millisecond pulsar was
modelled. In addition to pulsar emission characteristics, the synthetic pulsar
model yielded spectra of electrons escaping pulsar magnetosphere. To simulate
gamma-ray emission of globular cluster, both products of synthetic millisecond
pulsar modelling were used. Gamma-ray spectra of synthetic millisecond pulsars
residing in the cluster were summed to produce the magnetospheric component of
cluster emission. Electrons ejected by these pulsars were injected into
synthetic globular cluster environment. Their diffusion and interaction, both,
with cluster magnetic field and ambient photon fields, were performed with
Bednarek & Sitarek (2007) model yielding ICS component of cluster emission. The
sum of the magnetospheric and ICS components gives the synthetic gamma-ray
spectrum of globular cluster. The synthetic cluster spectrum stretches from GeV
to TeV energies. Detailed modelling was preformed for two globular clusters:
Ter 5 and 47 Tuc. Simulations are able to reproduce (within errors) the shape
and the flux level of the GeV part of the spectrum observed for both clusters
with the Fermi/LAT instrument. The synthetic flux level obtained in the TeV
part of the clusters' spectrum is in agreement with a H.E.S.S. upper limit
determined for 47 Tuc, and with emission level recently detected for Ter 5 with
H.E.S.S. telescope. The synthetic globular cluster model, however, is not able
to reproduce the exact shape of the TeV spectrum observed for Ter 5.

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The categories of this paper are: acc-phys
22
The categories of this paper are: chao-dyn
12
The categories of this paper are: nucl-th
1
The categories of this paper are: cs
30
The categories of this paper are: q-alg
37
The categories of this paper are: supr-con
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The categories of this paper are: patt-sol
29
The categories of this paper are: funct-an
16
The categories of this paper are: stat
35
The categories of this paper are: mtrl-th
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The categories of this paper are: econ
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The categories of this paper are: eess
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The categories of this paper are: q-fin
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The categories of this paper are: q-bio
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The categories of this paper are: hep-ex
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The categories of this paper are: nucl-ex