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LS 5039 is among the most interesting VHE sources in the Galaxy. Twoscenarios have been put forward to explain the observed TeV radiation: jets vspulsar winds. The source has been detected during the superior conjunction ofthe compact object, when very large gamma-ray opacities are expected. Inaddition, electromagnetic cascades, which may make the system more transparentto gamma-rays, are hardly efficient for realistic magnetic fields in massivestar surroundings. All this makes unlikely the standard pulsar scenario for LS5039, in which the emitter is the region located between the star and thecompact object, where the opacities are the largest. Otherwise, a jet-like flowcan transport energy to regions where the photon-photon absorption is muchlower and the TeV radiation is not so severely absorbed.

Clues to unveil the emitter in LS 5039: powerful jets vs colliding winds