A rotating hollow cone anisotropy of TeV emission from binary systems

Abstract

We show that TeV gamma-ray emission produced via interactions of high-energy particles with anisotropic radiation field of a massive star in binary systems should have a characteristic rotating hollow cone anisotropy pattern. The hollow cone, whose axis is directed away from the massive star, rotates with the period equal to the orbital period of the system. We note that the two maxima pattern of the TeV energy band lightcurve of the gamma-ray loud binary LS 5039 can be interpreted in terms of this rotating hollow cone model. Adopting such an interpretation, we are able to constrain the geometry of the system - either the inclination angle of the binary orbit, or the elevation of the gamma-ray emission region above the orbital plane.

Ap.J.Lett., accepted

References in corpus (5)

• Variable Very High Energy Gamma-ray Emission from the Microquasar LS I +61 303
• Discovery of the Binary Pulsar PSR B1259-63 in Very-High-Energy Gamma Rays around Periastron with H.E.S.S
• 3.9 day orbital modulation in the TeV gamma-ray flux and spectrum from the X-ray binary LS 5039
• A possible black hole in the gamma-ray microquasar LS 5039
• The modulation of the gamma-ray emission from the binary LS 5039

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• A compact pulsar wind nebula model of the gamma-ray loud binary LS I +61 303
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• Modelling the multi-wavelength emissions from PSR B1259-63/LS 2883: the effects of the stellar disc on shock radiations
• Very high energy Fermi/LAT detection of HESS J0632+057
• Galactic Observatory Science with the ASTRI Mini-Array at the Observatorio del Teide
• Decade-long X-ray observations of HESS J0632+057
• Modeling the High-energy Emission from the Gamma-ray Binary 1FGL J1018.6-5856