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http://hdl.handle.net/2445/44964
Title: | Probing quantum gravity using photons from a flare of the active galactic nucleus Markarian 501 observed by the MAGIC telescope |
Author: | Albert, J. Aliu, E. Antoranz, P. Baixeras Divar, Carmen Barrio, J. A. Bordas Coma, Pol Bosch i Ramon, Valentí Errando, M. Fonseca, M. V. Font, L. García López, R. J. Gaug, Markus Herrero, Artemio Laille, A. Martinez, Manuel Mazin, D. Moralejo, Abelardo Paredes i Poy, Josep Maria Ribó Gomis, Marc Zabalza de Torres, Víctor |
Keywords: | Astronomia de raigs gamma Nucli galàctic actiu Gravetat quàntica Supersimetria Fotons Telescopis espacials Gamma ray astronomy Active galactic nuclei Quantum gravity Supersymmetry Photons Space telescopes |
Issue Date: | 2008 |
Publisher: | Elsevier B.V. |
Abstract: | We analyze the timing of photons observed by the MAGIC telescope during a flare of the active galactic nucleus Mkn 501 for a possible correlation with energy, as suggested by some models of quantum gravity (QG), which predict a vacuum refractive index similar or equal to 1 + (E/M-QGn)(n), n = 1, 2. Parametrizing the delay between gamma-rays of different energies as Delta t = +/-tau E-1 or Delta t = +/-tau E-q(2), we find tau(1) = (0.030 +/- 0.012) s/GeV at the 2.5-sigma level, and tau(q) = (3.71 +/- 2.57) x 10(-6) s/GeV2, respectively. We use these results to establish lower limits M-QG1 > 0.21 X 10(18) GeV and M-QG2 > 0.26 x 10(11) GeV at the 95% C.L. Monte Carlo studies confirm the MAGIC sensitivity to propagation effects at these levels. Thermal plasma effects in the source are negligible, but we cannot exclude the importance of some other source effect. |
Note: | Versió postprint del document publicat a: http://dx.doi.org/10.1016/j.physletb.2008.08.053 |
It is part of: | Physics Letters B, 2008, vol. 668, num. 4, p. 253-257 |
URI: | http://hdl.handle.net/2445/44964 |
Related resource: | http://dx.doi.org/10.1016/j.physletb.2008.08.053 |
ISSN: | 0370-2693 |
Appears in Collections: | Articles publicats en revistes (Física Quàntica i Astrofísica) |
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