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dc.contributor.authorAbramowski, A.
dc.contributor.authorBüsching, I.
dc.contributor.authorDe Jager, O.C.
dc.contributor.authorVenter, C.
dc.contributor.authorVorster, M.
dc.contributor.authorH.E.S.S. Collaboration
dc.identifier.citationAbramowski, A. et al. 2011. Search for Lorentz invariance breaking with a likelihood fit of the PKS 2155-304 flare data taken on MJD 53944. Astroparticle physics, 34(9):738-747. []en_US
dc.identifier.issn1873-2852 (Online)
dc.description.abstractSeveral models of Quantum Gravity predict Lorentz Symmetry breaking at energy scales approaching the Planck scale (∼1019 GeV). With present photon data from the observations of distant astrophysical sources, it is possible to constrain the Lorentz Symmetry breaking linear term in the standard photon dispersion relations. Gamma Ray Bursts (GRB) and flaring Active Galactic Nuclei (AGN) are complementary to each other for this purpose, since they are observed at different distances in different energy ranges and with different levels of variability. Following a previous publication of the High Energy Stereoscopic System (H.E.S.S.) collaboration [1], a more sensitive event-by-event method consisting of a likelihood fit is applied to PKS 2155-304 flare data of MJD 53944 (July 28, 2006) as used in the previous publication. The previous limit on the linear term is improved by a factor of ∼3 up to GeV and is currently the best result obtained with blazars. The sensitivity to the quadratic term is lower and provides a limit of 6.4 × 1010 GeV, which is the best value obtained so far with an AGN and similar to the best limits obtained with GRB.en_US
dc.subjectActive galaxiesen_US
dc.subjectPKS 2155-304en_US
dc.subjectquantum gravityen_US
dc.subjectLorentz invariance breakingen_US
dc.titleSearch for Lorentz invariance breaking with a likelihood fit of the PKS 2155-304 flare data taken on MJD 53944en_US
dc.contributor.researchID12006653 - Venter, Christo
dc.contributor.researchID12792322 - Vorster, Michael Johannes
dc.contributor.researchID10065857 - De Jager, Ocker Cornelis
dc.contributor.researchID13235176 - Büsching, Ingo

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