Título:
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Very-High-Energy gamma rays from a Distant Quasar: How Transparent Is the Universe?
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Autor/a:
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Albert, J.; Aliu, E.; Antoranz, P.; Baixeras Divar, Carmen; Barrio, J. A.; Bordas Coma, Pol; Bosch i Ramon, Valentí; Camara, M.; Contreras, J. L.; Cortina Blanco, Juan; Cea del Pozo, Elsa de; Reyes, R. de los; Errando, M.; Fernández Sánchez, Enrique; Firpo, R.; Paredes i Poy, Josep Maria; Ribó Gomis, Marc; Sierpowska-Bartosik, A.; Tescaro, Diego; Zabalza de Torres, Víctor
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Otros autores:
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Universitat de Barcelona |
Abstract:
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The atmospheric Cherenkov gamma-ray telescope MAGIC, designed for a low-energy threshold, has detected very-high-energy gamma rays from a giant flare of the distant Quasi-Stellar Radio Source (in short: radio quasar) 3C 279, at a distance of more than 5 billion light-years (a redshift of 0.536). No quasar has been observed previously in very-high-energy gamma radiation, and this is also the most distant object detected emitting gamma rays above 50 gigaelectron volts. Because high-energy gamma rays may be stopped by interacting with the diffuse background light in the universe, the observations by MAGIC imply a low amount for such light, consistent with that known from galaxy counts. |
Materia(s):
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-Quàsars -Telescopis espacials -Astronomia de raigs gamma -Astrofísica -Quasars -Space telescopes -Gamma ray astronomy -Astrophysics |
Derechos:
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(c) Albert, J. et al., 2008
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Tipo de documento:
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Artículo Artículo - Versión aceptada |
Editor:
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American Association for the Advancement of Science
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