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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Published in:Science (American Association for the Advancement of Science) 2006-06, Vol.312 (5781), p.1771-1773
Main Authors: Aliu, E, Anderhub, H, Antoranz, P, Armada, A, Asensio, M, Baixeras, C, Bartelt, M, Bavikadi, S.R, Bednarek, W, Bigongiari, C, Biland, A, Bock, R.K, Bordas, P, Bosch-Ramon, V, Bretz, T, Camara, M, Carmona, E, Commichau, S, Contreras, J.L, Curtef, V, Danielyan, V, De Angelis, A, De Lotto, B, Dorner, D, Errando, M, Firpo, R, Fonseca, M.V, Font, L, Fuchs, M, Garczarczyk, M, Gaug, M, Giller, M, Hakobyan, D, Hengstebeck, T, Höhne, D, Hose, J, Isar, P.G, Jacon, P, Kranich, D, Laatiaoui, M, Laille, A, Lenisa, T, Lindfors, E, Lombardi, S, Longo, F, López, M, Lorenz, E, Lucarelli, F, Majumdar, P, Mansutti, O, Martínez, M, Mase, K, Mazin, D, Merck, C, Meyer, M, Miranda, J.M, Mirzoyan, R, Mizobuchi, S, Moralejo, A, Nilsson, K, Oña-Wilhelmi, E, Otte, N, Paneque, D, Paredes, J.M, Pascoli, D, Persic, M, Poller, M, Prandini, E, Rhode, W, Ribó, M, Rico, J, Robert, A, Romero, G.E, Rügamer, S, Saggion, A, Sartori, P, Scalzotto, V, Scapin, V, Schmitt, R, Schweizer, T, Shayduk, M, Shore, S.N, Sidro, N, Sobczynska, D, Stamerra, A, Stark, L.S, Takalo, L, Temnikov, P, Tescaro, D, Teshima, M, Tonello, N, Torres, D.F, Turini, N, Vankov, H, Vitale, V, Wagner, R.M, Wibig, T, Wittek, W, Zanin, R, Zapatero, J
Format: Article
Language:English
Subjects:
Astrofísica
Astronomia de raigs gamma
Astronomy
Astrophysical jets
Astrophysics
Binary systems
Compact stars
Cosmic rays
Double stars
Earth, ocean, space
Emissions
Estels binaris
Exact sciences and technology
Gamma ray astronomy
Gamma ray sources
Gamma rays
Gamma-ray sources
gamma-ray bursts
Interstellar medium (ism) and nebulae in milky way
Jets (Astrofísica)
Jets, outflows, and bipolar flows
Orbits
Periastron
Photons
Quasars
Quàsars
Radio astronomy
Radioastronomia
Raigs còsmics
Relativistic jets
Space based observatories
Stellar systems. Galactic and extragalactic objects and systems. The universe
Telescopes
Unidentified sources and radiation outside the solar system
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Summary: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.
ISSN:0036-8075
1095-9203
DOI:10.1126/science.1128177