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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
Telescopis espacials
Gamma ray astronomy
Active galactic nuclei
Quantum gravity
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:
It is part of: Physics Letters B, 2008, vol. 668, num. 4, p. 253-257
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ISSN: 0370-2693
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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