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dc.contributor.authorAlbert, J.-
dc.contributor.authorAliu, E.-
dc.contributor.authorAntoranz, P.-
dc.contributor.authorBaixeras Divar, Carmen-
dc.contributor.authorBarrio, J. A.-
dc.contributor.authorBordas Coma, Pol-
dc.contributor.authorBosch i Ramon, Valentí-
dc.contributor.authorCamara, M.-
dc.contributor.authorContreras, J. L.-
dc.contributor.authorCortina Blanco, Juan-
dc.contributor.authorCea del Pozo, Elsa de-
dc.contributor.authorReyes, R. de los-
dc.contributor.authorErrando, M.-
dc.contributor.authorFernández Sánchez, Enrique-
dc.contributor.authorFirpo, R.-
dc.contributor.authorParedes i Poy, Josep Maria-
dc.contributor.authorRibó Gomis, Marc-
dc.contributor.authorSierpowska-Bartosik, A.-
dc.contributor.authorTescaro, Diego-
dc.contributor.authorZabalza de Torres, Víctor-
dc.description.abstractThe 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.-
dc.format.extent9 p.-
dc.publisherAmerican Association for the Advancement of Science-
dc.relation.isformatofVersió postprint del document publicat a:
dc.relation.ispartofScience, 2008, vol. 320, num. 5884, p. 1752-1754-
dc.rights(c) Albert, J. et al., 2008-
dc.subject.classificationTelescopis espacials-
dc.subject.classificationAstronomia de raigs gamma-
dc.subject.otherSpace telescopes-
dc.subject.otherGamma ray astronomy-
dc.titleVery-High-Energy gamma rays from a Distant Quasar: How Transparent Is the Universe?-
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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