Albert, J.Aliu, E.Armada, A.Bordas Coma, PolBosch i Ramon, ValentíCortina Blanco, JuanDomingo Santamaría, EvaErrando, M.Fernández, EnriqueFirpo, R.Flix, J.López, J.Martinez, ManuelMoralejo, AbelardoOña-Wilhelmi, Emma deParedes i Poy, Josep MariaRibó Gomis, MarcSidro Martín, NúriaTescaro, DiegoZapatero, J.2013-08-012013-08-0120060036-8075https://hdl.handle.net/2445/45325Microquasars 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.11 p.application/pdfeng(c) Albert, J. et al., 2006QuàsarsEstels binarisRadioastronomiaRaigs còsmicsJets (Astrofísica)Astronomia de raigs gammaAstrofísicaQuasarsDouble starsRadio astronomyCosmic raysAstrophysical jetsGamma ray astronomyAstrophysicsinfo:eu-repo/semantics/article5467202013-08-01info:eu-repo/semantics/openAccess