Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Anisotropic scattering from the circumstellar disc in PSR B1259-63   The gamma-ray binary system PSR B1259-63 has recently passed through
periastron and has been of particular interest as it was observed by Fermi near
the December 2010 periastron passage. The system has been detected at very high
energies with H.E.S.S. The most probable production mechanism is inverse
Compton scattering between target photons from the optical companion and disc,
and relativistic electrons in the pulsar wind. We present results of a full
anisotropic inverse Compton scattering model of the system, taking into account
the IR excess from the extended circumstellar disc around the optical
companion.

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The categories of this paper are: cond-mat
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The categories of this paper are: cs
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The categories of this paper are: cmp-lg
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The categories of this paper are: nlin
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The categories of this paper are: chao-dyn
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The categories of this paper are: math
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The categories of this paper are: patt-sol
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The categories of this paper are: dg-ga
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The categories of this paper are: hep-ex
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The categories of this paper are: eess
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The categories of this paper are: nucl-ex
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The categories of this paper are: nucl-th
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The categories of this paper are: acc-phys
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The categories of this paper are: solv-int
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The categories of this paper are: econ
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The categories of this paper are: hep-th