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dc.contributor.authorRomoli, C.
dc.contributor.authorZacharias, M.
dc.contributor.authorMeyer, M.
dc.contributor.authorAit Benkhali, F.
dc.contributor.authorJacholkowska, A.
dc.date.accessioned2018-05-29T07:35:35Z
dc.date.available2018-05-29T07:35:35Z
dc.date.issued2017
dc.identifier.citationRomoli, C. et al. 2017. Observation of the extremely bright flare of the FSRQ 3C279 with H.E.S.S. II. 35th International Cosmic Ray Conference - ICRC2017- 10-20 July, 2017 Bexco, Busan, Korea. Proceedings of science, 301: Article no 649. [https://pos.sissa.it/301/649/pdf]en_US
dc.identifier.issn1824-8039 (Online)
dc.identifier.urihttp://hdl.handle.net/10394/26928
dc.identifier.urihttps://pos.sissa.it/301/649/pdf
dc.identifier.urihttps://pos.sissa.it/301/
dc.description.abstractIn June 2015, the Flat Spectrum Radio Quasar 3C 279 underwent an extremely bright gamma-ray flare, with an increase of the flux above 100 MeV by a factor 10 in less than 1 day, revealing an intrinsic variability timescale of 2 minutes as detected by the Fermi-LAT. We present results of target of opportunity observations with the H.E.S.S. experiment on this source over the nights around the peak of the outburst. The H.E.S.S. data were analysed with mono and stereo chains. Thanks to the extreme brightness of the source at GeV energies, it was possible to obtain data from Fermi-LAT, strictly simultaneous to the H.E.S.S. observation. Simultaneous and quasisimultaneous observations at optical and X-ray energies were gathered to reconstruct the multiwavelength spectrum helping to constrain theoretical models describing the flare. The H.E.S.S. observation during the second night, using H.E.S.S. II MONO data, lead to a clear detection of the source in about 3 hours of live-time. The H.E.S.S. results were also used to derive limits on the Quantum Gravity scale under the assumption of Lorentz Invariance Violation. Furthermore, since FSRQs possess intense optical photon fields surrounding the central region near the black hole, the VHE data allows constraints on the location of the emitting region to be derived in order that internal absorption be avoided. The detection of VHE emission from the powerful flare of the FSRQ 3C 279 by H.E.S.S. II can provide unique insights into the physical properties of this class of blazar, thanks in part to the presence of simultaneous and quasi-simultaneous datasets at other wavelengths. Due to the high redshift of the source (z=0.54), it was also possible to derive strong constraints on the Quantum Gravity mass scaleen_US
dc.language.isoenen_US
dc.publisherPoSen_US
dc.titleObservation of the extremely bright flare of the FSRQ 3C279 with H.E.S.S. IIen_US
dc.typePresentationen_US
dc.contributor.researchID29092086 - Zacharias, Michael


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