Variable very-high-energy gamma-ray emission from the microquasar LS I +61 303



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Antoranz Canales, Pedro and Barrio Uña, Juan Abel and Contreras González, José Luis and Fonseca González, Mª Victoria and López Moya, Marcos and Miranda Pantoja, José Miguel (2006) Variable very-high-energy gamma-ray emission from the microquasar LS I +61 303. Science, 312 (5781). pp. 1771-1773. ISSN 0036-8075

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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 LSI+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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© American Association for the Advancement of Science.We thank the Instituto de Astrofísica de Canarias for the excellent working conditions at the Observatory Roque de los Muchachos in La Palma. Supported by the Bundesministerium für Bildung und Forschung and Max-Planck-Gesellschaft (Germany), INFN (Italy), Comisión Interministerial de Ciencia y Tecnología and Ministerio de
© American Association for the Advancement of Science. Educación y Ciencia grant AYA2004-07171-C02-01 (Spain), ETH (Switzerland) research grant TH-34/04-3, and Ministerstwo Nauki i Informatyzacji (Poland) grant 1P03D01028.

Uncontrolled Keywords:LS-I +61-Degrees-303, Source 2CG 135+01, X-Ray, Star LSI+61-Degrees-303, Light-Curve, Binary, I+61-Degrees-303, LS-I+61-303; Parameters, Discovery.
Subjects:Sciences > Physics > Electronics
Sciences > Physics > Electricity
Sciences > Physics > Nuclear physics
ID Code:24198
Deposited On:20 Jan 2014 12:59
Last Modified:10 Dec 2018 14:58

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