Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Non-thermal radiation from a pulsar wind interacting with an
  inhomogeneous stellar wind   Binaries hosting a massive star and a non-accreting pulsar are powerful
non-thermal emitters due to the interaction of the pulsar and the stellar wind.
The winds of massive stars are thought to be inhomogeneous, which could have an
impact on the non-thermal emission. We study numerically the impact of the
presence of inhomogeneities or clumps in the stellar wind on the high-energy
non-thermal radiation of high-mass binaries hosting a non-accreting pulsar. We
compute the trajectories and physical properties of the streamlines in the
shocked pulsar wind without clumps, with a small clump, and with a large one.
This information is used to compute the synchrotron and inverse Compton
emission from the non-thermal populations, accounting also for the effect of
gamma-ray absorption through pair creation. A specific study is done for PSR
B1259-63/LS2883. When stellar wind clumps perturb the two-wind interaction
region, the associated non-thermal radiation in the X-ray band,of synchrotron
origin, and in the GeV-TeV band, of inverse Compton origin, is affected by
several effects: (i) strong changes in the the plasma velocity direction that
result in Doppler boosting factor variations, (ii) strengthening of the
magnetic field that mainly enhances the synchrotron radiation, (iii)
strengthening of the pulsar wind kinetic energy dissipation at the shock,
potentially available for particle acceleration, and (iv) changes in the rate
of adiabatic losses that affect the lower energy part of the non-thermal
particle population. The radiation above 100 GeV detected, presumably, during
the post-periastron crossing of the Be star disc in PSR B1259-63/LS2883, can be
roughly reproduced assuming that the crossing of the disc is modeled as the
encounter with a large inhomogeneity.

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The categories of this paper are: cs
30
The categories of this paper are: q-alg
14
The categories of this paper are: math-ph
37
The categories of this paper are: supr-con
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The categories of this paper are: funct-an
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The categories of this paper are: plasm-ph
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The categories of this paper are: q-bio
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The categories of this paper are: stat
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The categories of this paper are: ao-sci
9
The categories of this paper are: nlin
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The categories of this paper are: q-fin
12
The categories of this paper are: nucl-th
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The categories of this paper are: hep-th
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The categories of this paper are: hep-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: alg-geom