Modulation of the high energy γ-ray flux from PSR B1259-63/SS2883 due to the orbital variation of the maximum energy of accelerated electrons

  • Dmitry Khangulyan
  • Slavomir Hnatic
  • Felix Aharonian
Conference paper


The inverse Compton (IC) scattering of ultrarelativistic electrons accelerated at the pulsar wind termination shock is generally believed to be responsible for TeV gamma-ray signal recently reported from the binary system PSR B1259-63/SS2883. In such a system the acceleration takes place in the presence of a dense radiation field provided by a companion Be2-type star. Thus it is natural to expect an orbital phase dependence of the acceleration efficiency in the system. The HESS collaboration reported the tendency of reduction of TeV γ-rays around the periastron. In this paper we study a possible explanation of this effect by the “early” (sub-TeV) cutoffs in the energy spectrum of accelerated electrons due to the enhanced rate of Compton losses close to the periastron.


Acceleration of particles—binaries Gamma-rays PSR B1259-63 


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Copyright information

© Springer 2007

Authors and Affiliations

  • Dmitry Khangulyan
    • 1
  • Slavomir Hnatic
    • 1
  • Felix Aharonian
    • 1
  1. 1.Max-Planck-Institut für KernphysikHeidelbergGermany

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