Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The optical to gamma-ray emission of the Crab pulsar: a multicomponent
  model   We present a multicomponent model to explain the features of the pulsed
emission and spectrum of the Crab Pulsar, on the basis of X and gamma-ray
observations obtained with BeppoSAX, INTEGRAL and CGRO. This model explains the
evolution of the pulse shape and of the phase-resolved spectra, ranging from
the optical/UV to the GeV energy band, on the assumption that the observed
emission is due to more components. The first component, C_O, is assumed to
have the pulsed double-peaked profile observed at the optical frequencies,
while the second component, C_X, is dominant in the interpeak and second peak
phase regions. The spectra of these components are modelled with log-parabolic
laws and their spectral energy distributions have peak energies at 12.2 and 178
keV, respectively. To explain the properties of the pulsed emission in the
MeV-GeV band, we introduce two more components, C_Ogamma and C_Xgamma, with
phase distributions similar to those of C_O and C_X and log-parabolic spectra
with the same curvature but peak energies at about 300 MeV and 2 GeV. This
multicomponent model is able to reproduce both the broadband phase-resolved
spectral behaviour and the changes of the pulse shape with energy. We also
propose some possible physical interpretations in which C_O and C_X are emitted
by secondary pairs via a synchrotron mechanism while C_Ogamma and C_Xgamma can
originate either from Compton scattered or primary curvature photons.

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The categories of this paper are: cmp-lg
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The categories of this paper are: ao-sci
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The categories of this paper are: adap-org
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The categories of this paper are: hep-th
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The categories of this paper are: gr-qc
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The categories of this paper are: patt-sol
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The categories of this paper are: chem-ph
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The categories of this paper are: supr-con
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The categories of this paper are: chao-dyn
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The categories of this paper are: quant-ph
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The categories of this paper are: stat
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The categories of this paper are: q-bio
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The categories of this paper are: cs
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The categories of this paper are: econ
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The categories of this paper are: physics
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The categories of this paper are: acc-phys