Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Non-thermal emissions from outer magnetospheric accelerators of
  middle-aged pulsars   We discuss $\gamma$-ray emissions from the outer gap accelerators of
middle-aged pulsars for part of the series of our studies. A two-dimensional
electrodynamic model is used to solve the distribution of accelerating electric
fields with electron and positron pair creation and radiation processes in the
magnetic meridional plane. We compute the curvature radiation and the
synchrotron radiation by solving the evolution of the Lorentz factor and the
pitch angle. The calculated spectra are compared with observed phase-averaged
spectra. We also use a three-dimensional geometrical model to discuss the pulse
profiles. We argue that the outer gap of middle-aged pulsars occupies the whole
region between the last-open field lines and the critical magnetic field lines,
which are perpendicular to the rotational axis at the light cylinder. We assume
that there is no outer gap accelerator inside the light cylinder between the
rotational axis and the critical magnetic field lines. For the Geminga pulsar,
we demonstrate that the outward curvature radiation dominates in the spectrum
above 10 MeV, while the inward synchrotron radiation dominates below 10 MeV. We
find that the computed spectrum is consistent with the observations in X-ray
through $\gamma$-ray bands. With the pulse morphology of the $\gamma$-ray
emissions, we argue that the inclination angle and the viewing angle for the
Geminga pulsar are $\alpha\sim 50^{\circ}$ and $\xi\sim 90^{\circ}$,
respectively.

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The categories of this paper are: hep-th
1
The categories of this paper are: cs
35
The categories of this paper are: mtrl-th
13
The categories of this paper are: quant-ph
36
The categories of this paper are: cmp-lg
4
The categories of this paper are: cond-mat
37
The categories of this paper are: supr-con
12
The categories of this paper are: nucl-th
16
The categories of this paper are: stat
21
The categories of this paper are: adap-org
28
The categories of this paper are: alg-geom
15
The categories of this paper are: nucl-ex
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The categories of this paper are: comp-gas
34
The categories of this paper are: chem-ph
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The categories of this paper are: gr-qc
33
The categories of this paper are: plasm-ph