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. 2006 Jun 23;312(5781):1771-3.
doi: 10.1126/science.1128177. Epub 2006 May 18.

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

J Albert  1 , E Aliu, H Anderhub, P Antoranz, A Armada, M Asensio, C Baixeras, J A Barrio, M Bartelt, H Bartko, D Bastieri, S R Bavikadi, W Bednarek, K Berger, C Bigongiari, A Biland, E Bisesi, R K Bock, P Bordas, V Bosch-Ramon, T Bretz, I Britvitch, M Camara, E Carmona, A Chilingarian, S Ciprini, J A Coarasa, S Commichau, J L Contreras, J Cortina, V Curtef, V Danielyan, F Dazzi, A De Angelis, R de Los Reyes, B De Lotto, E Domingo-Santamaría, D Dorner, M Doro, M Errando, M Fagiolini, D Ferenc, E Fernández, R Firpo, J Flix, M V Fonseca, L Font, M Fuchs, N Galante, M Garczarczyk, M Gaug, M Giller, F Goebel, D Hakobyan, M Hayashida, T Hengstebeck, D Höhne, J Hose, C C Hsu, P G Isar, P Jacon, O Kalekin, R Kosyra, D Kranich, M Laatiaoui, A Laille, T Lenisa, P Liebing, E Lindfors, S Lombardi, F Longo, J López, M López, E Lorenz, F Lucarelli, P Majumdar, G Maneva, K Mannheim, O Mansutti, M Mariotti, M Martínez, K Mase, D Mazin, C Merck, M Meucci, M Meyer, J M Miranda, R Mirzoyan, S Mizobuchi, A Moralejo, K Nilsson, E Oña-Wilhelmi, R Orduña, N Otte, I Oya, D Paneque, R Paoletti, J M Paredes, M Pasanen, D Pascoli, F Pauss, N Pavel, R Pegna, M Persic, L Peruzzo, A Piccioli, M Poller, G Pooley, E Prandini, A Raymers, W Rhode, M Ribó, J Rico, B Riegel, M Rissi, A Robert, G E Romero, S Rügamer, A Saggion, A Sánchez, P Sartori, V Scalzotto, V Scapin, R Schmitt, T Schweizer, M Shayduk, K Shinozaki, S N Shore, N Sidro, A Sillanpää, D Sobczynska, A Stamerra, L S Stark, L Takalo, P Temnikov, D Tescaro, M Teshima, N Tonello, A Torres, D F Torres, N Turini, H Vankov, V Vitale, R M Wagner, T Wibig, W Wittek, R Zanin, J Zapatero
Affiliations
Free article

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

J Albert et al. Science. .
Free article

Abstract

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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