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3D Relativistic MHD simulations of the gamma-ray binaries
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3D Relativistic MHD simulations of the gamma-ray binaries
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In gamma-ray binaries neutron star is orbiting a companion that produces a strong stellar wind. We demonstrate that observed properties of "stellar wind"-"pulsar wind" interaction depend both on the overall wind thrust ratio, as well as more subtle geometrical factors: the relative direction of the pulsar's spin, the plane of the orbit, the direction of motion, and the instantaneous line of sight. Using fully 3D relativistic magnetohydrodynamical simulations we find that the resulting intrinsic morphologies can be significantly orbital phase-dependent: a given system may change from tailward-open to tailward-closed shapes. As a result, the region of unshocked pulsar wind can change by an order of magnitude over a quarter of the orbit. We calculate radiation maps and synthetic light curves for synchrotron (X-ray) and Inverse-Compton emission (GeV-TeV), taking into account $\gamma-\gamma$ absorption. Our modeled light curves are in agreement with the phase-dependent observed light curves of LS5039.
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Cited by 1 Pith paper
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Large-scale emission from gamma-ray binaries: the case of LS 5039
The arcminute X-ray emission around LS 5039 is consistently explained as synchrotron radiation from electrons accelerated at the termination shock of the mixed stellar/pulsar wind, with different source ages giving co...
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