Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Phase-Averaged Gamma-Ray Spectra from MSPs   {\it Fermi}-LAT has detected pulsed gamma-ray emissions with high confidences
from more than 40 millisecond pulsars (MSPs). Here we study the phase-averaged
gamma-ray properties of MSPs by using revised version of a self-consistent
outer gap model. In this model, a strong multipole magnetic field near the
stellar surface for a MSP is assumed and such a field will be close to the
surface magnetic fields ($\sim 10^{11}- 10^{12}$ G) of young ulsars; the outer
gap of a MSP is controlled by photon-photon pair production process, where the
effects of magnetic inclination angle ($\alpha$) and magnetic geometry have
been taken into account, therefore the fractional size of the outer gap is a
function of not only pulsar's period and magnetic field strength but also
magnetic inclination angle and radial distance to the neutron star, the inner
boundary of the outer gap can be estimated by the pair production process of
the gamma-ray photons which are produced by the back-flowing particles through
the null charge surface; inside the outer gap, a Gaussian distribution of the
parallel electric field along the trans-field thickness is assumed, and the
gamma-ray emission is represented by the emission from the average radial
distance along the central field lines of the outer gap. Using this model, the
phase-averaged gamma-ray spectra are calculated and compared with the observed
spectra of 37 MSPs given by the second {\it Fermi}-LAT catalog of gamma-ray
pulsars, our results show that the {\it Fermi}-LAT results can be well
explained by this model. The thermal X-ray emission properties from MSPs are
also investigated.

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The categories of this paper are: patt-sol
9
The categories of this paper are: nlin
23
The categories of this paper are: solv-int
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The categories of this paper are: acc-phys
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The categories of this paper are: chao-dyn
18
The categories of this paper are: econ
8
The categories of this paper are: hep-ex
4
The categories of this paper are: cond-mat
5
The categories of this paper are: gr-qc
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The categories of this paper are: hep-lat
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The categories of this paper are: alg-geom
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The categories of this paper are: supr-con
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The categories of this paper are: comp-gas
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The categories of this paper are: bayes-an
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The categories of this paper are: eess
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The categories of this paper are: cmp-lg