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Title: Very-High-Energy gamma rays from a Distant Quasar: How Transparent Is the Universe?
Author: 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
Keywords: Quàsars
Telescopis espacials
Astronomia de raigs gamma
Space telescopes
Gamma ray astronomy
Issue Date: 2008
Publisher: American Association for the Advancement of Science
Abstract: 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.
Note: Versió postprint del document publicat a:
It is part of: Science, 2008, vol. 320, num. 5884, p. 1752-1754
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ISSN: 0036-8075
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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