Show simple item record

dc.contributor.authorT. TANAKA, Y.
dc.contributor.authorSTAWARZ, L.
dc.contributor.authorJ. THOMPSON, D.
dc.contributor.authorD'AMMANDO, F.
hal.structure.identifierLaboratoire Leprince-Ringuet [LLR]
dc.contributor.authorJ. FEGAN, S.
hal.structure.identifierCentre d'Etudes Nucléaires de Bordeaux Gradignan [CENBG]
dc.contributor.authorLOTT, B.
dc.contributor.authorL. WOOD, D.
dc.contributor.authorC. CHEUNG, C.
dc.contributor.authorFINKE, J.
dc.contributor.authorBUSON, S.
hal.structure.identifierCentre d'Etudes Nucléaires de Bordeaux Gradignan [CENBG]
dc.contributor.authorESCANDE, L.
dc.contributor.authorSAITO, S.
dc.contributor.authorOHNO, M.
dc.contributor.authorTAKAHASHI, T.
dc.contributor.authorDONATO, D.
dc.contributor.authorCHIANG, J.
dc.contributor.authorGIROLETTI, M.
dc.contributor.authorK. SCHINZEL, F.
dc.contributor.authorIAFRATE, G.
dc.contributor.authorLONGO, F.
dc.contributor.authorCIPRINI, S.
dc.date.issued2011-05-20
dc.identifier.issn0004-637X
dc.description.abstractEnIn this paper, we report on the two-year-long Fermi-Large Area Telescope observation of the peculiar blazar 4C +21.35 (PKS 1222+216). This source was in a quiescent state from the start of the science operations of the Fermi Gamma-ray Space Telescope in 2008 August until 2009 September, and then became more active, with gradually increasing flux and some moderately bright flares. In 2010 April and June, 4C +21.35 underwent a very strong GeV outburst composed of several major flares characterized by rise and decay timescales of the order of a day. During the outburst, the GeV spectra of 4C +21.35 displayed a broken power-law form with spectral breaks observed near 1-3 GeV photon energies. We demonstrate that, at least during the major flares, the jet in 4C +21.35 carried a total kinetic luminosity comparable to the total accretion power available to feed the outflow. We also discuss the origin of the break observed in the flaring spectra of 4C +21.35. We show that, in principle, a model involving annihilation of the GeV photons on the He II Lyman recombination continuum and line emission of "broad-line region" clouds may account for such. However, we also discuss the additional constraint provided by the detection of 4C +21.35 at 0.07-0.4 TeV energies by the MAGIC telescope, which coincided with one of the GeV flares of the source. We argue that there are reasons to believe that the lsim TeV emission of 4C +21.35 (as well as the GeV emission of the source, if co-spatial) is not likely to be produced inside the broad-line region zone of highest ionization (~1017 cm from the nucleus), but instead originates further away from the active center, namely, around the characteristic scale of the hot dusty torus surrounding the 4C +21.35 nucleus (~1019 cm).
dc.language.isoen
dc.publisherAmerican Astronomical Society
dc.subject.engalaxies: active
dc.subject.engalaxies: jets
dc.subject.engamma rays: galaxies
dc.subject.enquasars: general
dc.subject.enquasars: individual (4C +21.35)
dc.subject.enradiation mechanisms: non-thermal
dc.title.enFermi Large Area Telescope Detection of Bright γ-Ray Outbursts from the Peculiar Quasar 4C +21.35
dc.typeArticle de revue
dc.identifier.doi10.1088/0004-637X/733/1/19
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.arxiv1101.5339
bordeaux.journalThe Astrophysical Journal
bordeaux.page19
bordeaux.volume733
bordeaux.peerReviewedoui
hal.identifierin2p3-00605520
hal.version1
hal.popularnon
hal.audienceNon spécifiée
hal.origin.linkhttps://hal.archives-ouvertes.fr//in2p3-00605520v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=The%20Astrophysical%20Journal&rft.date=2011-05-20&rft.volume=733&rft.spage=19&rft.epage=19&rft.eissn=0004-637X&rft.issn=0004-637X&rft.au=T.%20TANAKA,%20Y.&STAWARZ,%20L.&J.%20THOMPSON,%20D.&D'AMMANDO,%20F.&J.%20FEGAN,%20S.&rft.genre=article


Files in this item

FilesSizeFormatView

There are no files associated with this item.

This item appears in the following Collection(s)

Show simple item record