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dc.contributor.authorRANI, B.
hal.structure.identifierFERMI
dc.contributor.authorLOTT, B.
dc.contributor.authorP. KRICHBAUM, T.
dc.contributor.authorFUHRMANN, L.
dc.contributor.authorA. ZENSUS, J.
dc.date.issued2013
dc.identifier.issn0004-6361
dc.description.abstractEnWe present a \gamma-ray photon flux and spectral variability study of the flat-spectrum radio quasar 3C 273 over a rapid flaring activity period between September 2009 to April 2010. Five major flares are observed in the source during this period. The most rapid flare observed in the source has a flux doubling time of 1.1 hr. The rapid \gamma-ray flares allow us to constrain the location and size of the \gamma-ray emission region in the source. The \gamma \gamma-opacity constrains the Doppler factor, δγ≥ 10 for the highest energy (15 GeV) photon observed by the {\it Fermi}-Large Area Telescope (LAT). Causality arguments constrain the size of the emission region to 1.6×1015 cm. The \gamma-ray spectra measured over this period show clear deviations from a simple power law with a break in 1-2 GeV energy range. We discuss possible explanations for the origin of the \gamma-ray spectral breaks. Our study suggests that the \gamma-ray emission region in 3C 273 is located within the broad line region (<1.6 pc). The spectral behavior and temporal characteristics of the individual flares indicate the presence of multiple shock scenarios at the base of the jet.
dc.language.isoen
dc.publisherEDP Sciences
dc.subjectgamma rays: galaxies
dc.subjectgalaxies: active
dc.subjectquasars: individual: 3C 273
dc.title.enConstraining the location of rapid gamma-ray flares in the FSRQ 3C 273
dc.typeArticle de revue
dc.identifier.doi10.1051/0004-6361/201321440
dc.subject.halPhysique [physics]/Astrophysique [astro-ph]/Phénomènes cosmiques de haute energie [astro-ph.HE]
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]/Phénomènes cosmiques de haute energie [astro-ph.HE]
dc.identifier.arxiv1307.0854
bordeaux.journalAstronomy and Astrophysics - A&A
bordeaux.pageA71
bordeaux.volume557
bordeaux.peerReviewedoui
hal.identifierin2p3-00915615
hal.version1
hal.popularnon
hal.audienceNon spécifiée
hal.origin.linkhttps://hal.archives-ouvertes.fr//in2p3-00915615v1
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