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Probing quantum gravity using photons from a flare of the active galactic nucleus Markarian 501 observed by the MAGIC telescope
Albert, J.; Aliu, E.; Antoranz, P.; Baixeras Divar, Carmen; Barrio, J. A.; Bordas, P.; Bosch i Ramon, Valentí; Errando, M.; Fonseca, M. V.; Font, L.; García López, R. J.; Gaug, Markus; Herrero, A.; Laille, A.; Martinez, Manuel; Mazin, D.; Moralejo, Abelardo; Paredes i Poy, Josep Maria; Ribó Gomis, Marc; Zabalza de Torres, Víctor
Universitat de Barcelona
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.
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
(c) Elsevier B.V., 2008
Article
info:eu-repo/semantics/acceptedVersion
Elsevier B.V.
         

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