Please use this identifier to cite or link to this item:
https://hdl.handle.net/2445/44986
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 Astrofísica Quasars Space telescopes Gamma ray astronomy Astrophysics |
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: http://dx.doi.org/10.1126/science.1157087 |
It is part of: | Science, 2008, vol. 320, num. 5884, p. 1752-1754 |
URI: | https://hdl.handle.net/2445/44986 |
Related resource: | http://dx.doi.org/10.1126/science.1157087 |
ISSN: | 0036-8075 |
Appears in Collections: | Articles publicats en revistes (Física Quàntica i Astrofísica) |
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