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The emission mechanism of the gamma-ray binary LS5039 in energy bands of TeV,GeV, and X-ray is investigated. Observed light curves in LS5039 show that TeVand GeV fluxes anticorrelate and TeV and X-ray fluxes correlate. However, suchcorrelated variations have not been explained yet reasonably at this stage.Assuming that relativistic electrons are injected constantly at the location ofthe compact object as a point source, and that they lose energy only by theinverse Compton (IC) process, we calculate gamma-ray spectra and light curvesby the Monte Carlo method, including the full electromagnetic cascade process.Moreover, we calculated X-ray spectra and light curves by using the resultantelectron distribution. As a result, we are able to reproduce qualitativelyspectra and light curves observed by HESS, Fermi, and Suzaku for theinclination angle i = 30 dig and the index of injected electron distribution p= 2.5. We conclude that TeV-GeV anticorrelation is due to anisotropic ICscattering and anisotropic gamma-gamma absorption, and that TeV-X correlationis due to the dependence of IC cooling time on orbital phases. In addition, theconstraint on the inclination angle implies that the compact object in LS5039is a black hole.

Modulation Mechanism of TeV, GeV, and X-ray Emission in LS5039