Autor/a:
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Albert, J.; Aliu, E.; Armada, A.; Bordas Coma, Pol; Bosch i Ramon, Valentí; Cortina Blanco, Juan; Domingo Santamaría, Eva; Errando, M.; Fernández, Enrique; Firpo, R.; Flix, J.; López, J.; Martinez, Manuel; Moralejo, Abelardo; Oña-Wilhelmi, E.; Paredes i Poy, Josep Maria; Ribó Gomis, Marc; Sidro Martín, Núria; Tescaro, Diego; Zapatero, J.
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Abstract:
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Microquasars are binary star systems with relativistic radio-emitting jets. They are potential sources of cosmic rays and can be used to elucidate the physics of relativistic jets. We report the detection of variable gamma-ray emission above 100 gigaelectron volts from the microquasar LS I 61 + 303. Six orbital cycles were recorded. Several detections occur at a similar orbital phase, which suggests that the emission is periodic. The strongest gamma-ray emission is not observed when the two stars are closest to one another, implying a strong orbital modulation of the emission or absorption processes. |