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dc.contributor.authorAbramowski, A.
dc.contributor.authorBöttcher, M.
dc.contributor.authorDavids, I.D.
dc.contributor.authorIvascenko, A.
dc.contributor.authorKrüger, P.P.
dc.contributor.authorPekeur, N.W.
dc.contributor.authorSpanier, F.
dc.contributor.authorSushch, I.
dc.contributor.authorVenter, C.
dc.contributor.authorVorster, M.
dc.contributor.authorH.E.S.S. Collaboration
dc.date.accessioned2016-08-29T12:32:11Z
dc.date.available2016-08-29T12:32:11Z
dc.date.issued2015
dc.identifier.citationAbramowski, A. et al. 2015. The 2012 flare of PG 1553+113 seen with H.E.S.S. and Fermi-LAT. Astrophysical journal, 802(1): Article no 65. [https://doi.org/10.1088/0004-637X/802/1/65]en_US
dc.identifier.issn0004-637X
dc.identifier.issn1538-4357 (Online)
dc.identifier.urihttp://hdl.handle.net/10394/18432
dc.identifier.urihttps://doi.org/10.1088/0004-637X/802/1/65
dc.identifier.urihttp://iopscience.iop.org/article/10.1088/0004-637X/802/1/65
dc.description.abstractVery high energy (VHE, E > 100 GeV) γ-ray flaring activity of the high-frequency peaked BL Lac object PG 1553+113 has been detected by the H.E.S.S. telescopes. The flux of the source increased by a factor of 3 during the nights of 2012 April 26 and 27 with respect to the archival measurements with a hint of intra-night variability. No counterpart of this event has been detected in the Fermi-Large Area Telescope data. This pattern is consistent with VHE γ-ray flaring being caused by the injection of ultrarelativistic particles, emitting γ-rays at the highest energies. The dataset offers a unique opportunity to constrain the redshift of this source at z = 0.49 ± 0.04 using a novel method based on Bayesian statistics. The indication of intra-night variability is used to introduce a novel method to probe for a possible Lorentz invariance violation (LIV), and to set limits on the energy scale at which Quantum Gravity (QG) effects causing LIV may arise. For the subluminal case, the derived limits are EQG,1 > 4.10 × 1017 GeV and EQG,2 > 2.10 × 1010 GeV for linear and quadratic LIV effects, respectivelyen_US
dc.language.isoenen_US
dc.publisherIOP Publishingen_US
dc.subjectBL Lacertae objects: individual (PG 1553+113)en_US
dc.subjectGalaxies: activeen_US
dc.subjectGalaxies: distances and redshiftsen_US
dc.subjectGamma-rays: galaxiesen_US
dc.titleThe 2012 flare of PG 1553+113 seen with H.E.S.S. and Fermi-LATen_US
dc.typeArticleen_US
dc.contributor.researchID24420530 - Böttcher, Markus
dc.contributor.researchID13146629 - Davids, Isak Delberth
dc.contributor.researchID24790052 - Ivascenko, Alex
dc.contributor.researchID11749903 - Krüger, Petrus Paulus
dc.contributor.researchID22050574 - Pekeur, Nicolette Whilna
dc.contributor.researchID25161814 - Spanier, Felix Alexander
dc.contributor.researchID24922986 - Sushch, Iurii
dc.contributor.researchID12006653 - Venter, Christo
dc.contributor.researchID12792322 - Vorster, Michael Johannes


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