Variable Very-High-Energy Gamma-Ray Emission from the Microquasar LS I +61 303

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....

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Detalhes bibliográficos
Autores: 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, Emma de, Paredes i Poy, Josep Maria, Ribó Gomis, Marc, Sidro Martín, Núria, Tescaro, Diego, Zapatero, J.
Formato: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2006
País:España
Recursos:Universidad de Barcelona
Repositorio:Dipòsit Digital de la UB
OAI Identifier:oai:diposit.ub.edu:2445/45325
Acesso em linha:https://hdl.handle.net/2445/45325
Access Level:acceso abierto
Palavra-chave:Quàsars
Estels binaris
Radioastronomia
Raigs còsmics
Jets (Astrofísica)
Astronomia de raigs gamma
Astrofísica
Quasars
Double stars
Radio astronomy
Cosmic rays
Astrophysical jets
Gamma ray astronomy
Astrophysics
Descrição
Resumo: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.

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