Abstract
Gamma-ray binaries are composed of a massive star and possibly a young energetic pulsar. The stellar wind may confine the pulsar wind in a collimated relativistic outflow. Recent X-ray observations by Suzaku and INTEGRAL of LS 5039 show a steady and periodic X-ray emission correlated with the TeV modulation. The X-ray flux is maximum and minimum at both conjunctions, suggesting that the modulation is due to the peculiar orientation of the binary system with respect to the observer. The X-ray modulation could be explained by the relativistic motion of the flow in the pulsar wind. We investigate the Doppler-boosting effect in synchrotron radiation and inverse Compton scattering in gamma-ray binaries. This model can explain the X-ray modulation in LS 5039 and possibly explain the puzzling phasing of the TeV maximum emission in LS I +61?303.
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Cerutti, B., Dubus, G., Henri, G. (2011). Relativistic motion and beamed radiation in gamma-ray binaries. In: Torres, D., Rea, N. (eds) High-Energy Emission from Pulsars and their Systems. Astrophysics and Space Science Proceedings. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-17251-9_44
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DOI: https://doi.org/10.1007/978-3-642-17251-9_44
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