期刊
PHYSICS LETTERS B
卷 668, 期 4, 页码 253-257出版社
ELSEVIER
DOI: 10.1016/j.physletb.2008.08.053
关键词
Gamma-ray sources (Individual: Mkn 501); Active galactic nuclei; Quantum gravity; Supersymmetric models; Particle acceleration
资金
- German BMBF
- MPG
- Italian INFN
- Spanish CICYT
- ETH Research Grant TH [34/04 3]
- Polish MNiI [1P03D01028]
- European Union through the Marie Curie Research and Training Network UniverseNet [MRTN-CT-2006-035863]
- DOE [DE-FG02-95ER40917]
- ICREA Funding Source: Custom
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. (C) 2008 Elsevier B.V. All rights reserved.
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