GeV-TeV gamma-ray light curves expected in the IC electron-positron pair cascade model for massive binaries: Application to LS 5039

Abstract

TeV gamma-ray emission from two massive binaries of the microquasar type, LS 5039 and LS I +61${}^{\mathrm{o}}$ 303, show clear variability with their orbital periods. Our purpose is to calculate the GeV and TeV $\gamma$-ray light curves from the massive binary LS 5039 which are expected in the specific Inverse Compton $e^{\pm }$ pair cascade model. This model successfully predicted the basic features of the high energy $\gamma$-ray emission from LS 5039 and LS I +61 303. In the calculations we apply the Monte Carlo code which follows the IC $e^{\pm }$ pair cascade in the anisotropic radiation of the massive star. The $\gamma$-ray light curves and spectra are obtained for different parameters of the acceleration scenario and the inclination angles of the binary system. It is found that the GeV and TeV $\gamma$-ray light curves should be anti-correlated. This feature can be tested in the near future by the simultaneous observations of LS 5039 with the AGILE and GLAST telescopes in GeV energies and the Cherenkov telescopes in the TeV energies. Considered model also predicts a broad maximum in the TeV $\gamma$-ray light curve between the phases $\sim 0.4-0.8$ consistently with the observations of LS 5039 by the HESS telescopes. Moreover, we predict additional dip in the TeV light curve for large inclination angles $\sim 60^{\mathrm{o}}$. This feature could serve as a diagnostic for independent measuring of the inclination angle of this binary system indicating also on the presence of a neutron star in LS 5039.

5 pages, 4 figures, A&A accepted

References in corpus (6)

• Variable Very High Energy Gamma-ray Emission from the Microquasar LS I +61 303
• 3.9 day orbital modulation in the TeV gamma-ray flux and spectrum from the X-ray binary LS 5039
• Gamma Rays from Compton Scattering in the Jets of Microquasars: Application to LS 5039
• Propagation of very high energy gamma-rays inside massive binaries LS 5039 and LSI +61 303
• Gamma-rays from cascades in close massive binaries containing energetic pulsars
• Inverse Compton e-p pair cascade model for the gamma-ray production in massive binary LSI +61^o 303

Cited by in corpus (20)

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• The modulation of the gamma-ray emission from the binary LS 5039
• Modelling the high-energy emission from gamma-ray binaries using numerical relativistic hydrodynamics
• Unraveling the high-energy emission components of gamma-ray binaries
• Pulsar wind zone processes in LS 5039
• High-Energy emissions from the Pulsar/Be binary system PSR J2032+4127/MT91 213
• Pulsar model of the high energy phenomenology of LS 5039
• A model of the TeV flare of Cygnus X-1: electron acceleration and extended pair cascades
• Modeling the three-dimensional pair cascade in binaries. Application to LS 5039
• One-dimensional pair cascade emission in gamma-ray binaries
• High energy gamma-ray emission from compact galactic sources in the context of observations with the next generation Cherenkov Telescope Arrays
• Modeling the effects of clumpy winds in the high-energy light curves of γ-ray binaries
• Modulation Mechanism of TeV, GeV, and X-ray Emission in LS5039
• Gamma-ray binaries beyond one-zone models: an application to LS 5039
• High-(Energy)-Lights -- The Very High Energy Gamma-Ray Sky
• Optical depths for gamma-rays in the radiation field of a star heated by external X-ray source in LMXBs: Application to Her X-1 and Sco X-1
• Results from the binaries LS I +61°303 and LS 5039 after 2.5 years of Fermi monitoring