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The $\gamma$-ray spectrum of the core of Centaurus A as observed with H.E.S.S. and Fermi-LAT

dc.contributor.authorABDALLA, H.
dc.contributor.authorABRAMOWSKI, A.
dc.contributor.authorAHARONIAN, F.
dc.contributor.authorAIT BENKHALI, F.
dc.contributor.authorANGÜNER, E.O.
dc.contributor.authorARAKAWA, M.
hal.structure.identifierLaboratoire d'Annecy de Physique des Particules [LAPP]
dc.contributor.authorARMAND, C.
hal.structure.identifierLaboratoire Univers et Théories [LUTH (UMR_8102)]
dc.contributor.authorARRIETA, M.
dc.contributor.authorBACKES, M.
dc.contributor.authorBALZER, A.
dc.contributor.authorBARNARD, M.
dc.contributor.authorBECHERINI, Y.
dc.contributor.authorBECKER TJUS, J.
dc.contributor.authorBERGE, D.
dc.contributor.authorBERNHARD, S.
dc.contributor.authorBERNLÖHR, K.
dc.contributor.authorBLACKWELL, R.
dc.contributor.authorBÖTTCHER, M.
hal.structure.identifierLaboratoire Univers et Théories [LUTH (UMR_8102)]
dc.contributor.authorBOISSON, C.
hal.structure.identifierLaboratoire de Physique Nucléaire et de Hautes Énergies [LPNHE (UMR_7585)]
dc.contributor.authorBOLMONT, J.
dc.contributor.authorBONNEFOY, S.
dc.contributor.authorBORDAS, P.
hal.structure.identifierLaboratoire Univers et Particules de Montpellier [LUPM]
dc.contributor.authorBREGEON, J.
hal.structure.identifierCentre d'Etudes Nucléaires de Bordeaux Gradignan [CENBG]
dc.contributor.authorBRUN, F.
hal.structure.identifierInstitut de Recherches sur les lois Fondamentales de l'Univers [IRFU]
dc.contributor.authorBRUN, P.
dc.contributor.authorBRYAN, M.
dc.contributor.authorBÜCHELE, M.
dc.contributor.authorBULIK, T.
dc.contributor.authorCAPASSO, M.
hal.structure.identifierLaboratoire Leprince-Ringuet [LLR]
dc.contributor.authorCAROFF, S.
hal.structure.identifierLaboratoire d'Annecy de Physique des Particules [LAPP]
dc.contributor.authorCAROSI, A.
dc.contributor.authorCASANOVA, S.
hal.structure.identifierLaboratoire de Physique Nucléaire et de Hautes Énergies [LPNHE (UMR_7585)]
dc.contributor.authorCERRUTI, M.
dc.contributor.authorCHAKRABORTY, N.
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dc.contributor.authorCHAVES, R.C.G.
dc.contributor.authorCHEN, A.
hal.structure.identifierLaboratoire d'Annecy de Physique des Particules [LAPP]
dc.contributor.authorCHEVALIER, J.
dc.contributor.authorCOLAFRANCESCO, S.
hal.structure.identifierCentre d'Etudes Nucléaires de Bordeaux Gradignan [CENBG]
dc.contributor.authorCONDON, B.
dc.contributor.authorCONRAD, J.
dc.contributor.authorDAVIDS, I.D.
hal.structure.identifierInstitut de Recherches sur les lois Fondamentales de l'Univers [IRFU]
dc.contributor.authorDECOCK, J.
dc.contributor.authorDEIL, C.
hal.structure.identifierLaboratoire Univers et Particules de Montpellier [LUPM]
dc.contributor.authorDEVIN, J.
dc.contributor.authorDEWILT, P.
dc.contributor.authorDIRSON, L.
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dc.contributor.authorDJANNATI-ATAÏ, A
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dc.contributor.authorDYKS, J.
dc.contributor.authorEDWARDS, T.
dc.contributor.authorEGBERTS, K.
hal.structure.identifierLaboratoire de Physique Nucléaire et de Hautes Énergies [LPNHE (UMR_7585)]
dc.contributor.authorEMERY, G.
hal.structure.identifierCentre de Physique des Particules de Marseille [CPPM]
dc.contributor.authorERNENWEIN, J.-P.
dc.contributor.authorESCHBACH, S.
dc.contributor.authorFARNIER, C.
hal.structure.identifierLaboratoire Leprince-Ringuet [LLR]
dc.contributor.authorFEGAN, S.
dc.contributor.authorFERNANDES, M.V.
hal.structure.identifierLaboratoire d'Annecy de Physique des Particules [LAPP]
dc.contributor.authorFIASSON, A.
hal.structure.identifierLaboratoire Leprince-Ringuet [LLR]
dc.contributor.authorFONTAINE, G.
dc.contributor.authorFUNK, S.
dc.contributor.authorFÜSSLING, M.
hal.structure.identifierAstroParticule et Cosmologie [APC (UMR_7164)]
dc.contributor.authorGABICI, S.
hal.structure.identifierLaboratoire Univers et Particules de Montpellier [LUPM]
dc.contributor.authorGALLANT, Y.A.
dc.contributor.authorGARRIGOUX, T.
hal.structure.identifierLaboratoire d'Annecy de Physique des Particules [LAPP]
dc.contributor.authorGATÉ, F.
dc.contributor.authorGIAVITTO, G.
dc.contributor.authorGLAWION, D.
hal.structure.identifierInstitut de Recherches sur les lois Fondamentales de l'Univers [IRFU]
dc.contributor.authorGLICENSTEIN, J.F.
dc.contributor.authorGOTTSCHALL, D.
hal.structure.identifierCentre d'Etudes Nucléaires de Bordeaux Gradignan [CENBG]
dc.contributor.authorGRONDIN, M.-H.
dc.contributor.authorHAHN, J.
dc.contributor.authorHAUPT, M.
dc.contributor.authorHAWKES, J.
dc.contributor.authorHEINZELMANN, G.
hal.structure.identifierInstitut de Planétologie et d'Astrophysique de Grenoble [IPAG]
dc.contributor.authorHENRI, G.
dc.contributor.authorHERMANN, G.
dc.contributor.authorHINTON, J.A.
dc.contributor.authorHOFMANN, W.
dc.contributor.authorHOISCHEN, C.
dc.contributor.authorHOLCH, T.L.
dc.contributor.authorHOLLER, M.
dc.contributor.authorHORNS, D.
dc.contributor.authorIVASCENKO, A.
dc.contributor.authorIWASAKI, H.
hal.structure.identifierLaboratoire de Physique Nucléaire et de Hautes Énergies [LPNHE (UMR_7585)]
dc.contributor.authorJACHOLKOWSKA, A.
dc.contributor.authorJAMROZY, M.
dc.contributor.authorJANKOWSKY, D.
dc.contributor.authorJANKOWSKY, F.
dc.contributor.authorJINGO, M.
hal.structure.identifierAstroParticule et Cosmologie [APC (UMR_7164)]
dc.contributor.authorJOUVIN, L.
dc.contributor.authorJUNG-RICHARDT, I.
dc.contributor.authorKASTENDIECK, M.A.
dc.contributor.authorKATARZYŃSKI, K.
dc.contributor.authorKATSURAGAWA, M.
dc.contributor.authorKATZ, U.
hal.structure.identifierLaboratoire de Physique Nucléaire et de Hautes Énergies [LPNHE (UMR_7585)]
dc.contributor.authorKERSZBERG, D.
dc.contributor.authorKHANGULYAN, D.
hal.structure.identifierAstroParticule et Cosmologie [APC (UMR_7164)]
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dc.contributor.authorKING, J.
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dc.contributor.authorKOMIN, Nu.
hal.structure.identifierInstitut de Recherches sur les lois Fondamentales de l'Univers [IRFU]
dc.contributor.authorKOSACK, K.
dc.contributor.authorKRAKAU, S.
dc.contributor.authorKRAUS, M.
dc.contributor.authorKRÜGER, P.P.
hal.structure.identifierCentre d'Etudes Nucléaires de Bordeaux Gradignan [CENBG]
dc.contributor.authorLAFFON, H.
hal.structure.identifierLaboratoire d'Annecy de Physique des Particules [LAPP]
dc.contributor.authorLAMANNA, G.
dc.contributor.authorLAU, J.
hal.structure.identifierLaboratoire Univers et Théories [LUTH (UMR_8102)]
dc.contributor.authorLEFAUCHEUR, J.
hal.structure.identifierAstroParticule et Cosmologie [APC (UMR_7164)]
dc.contributor.authorLEMIÈRE, A.
hal.structure.identifierCentre d'Etudes Nucléaires de Bordeaux Gradignan [CENBG]
dc.contributor.authorLEMOINE-GOUMARD, M.
hal.structure.identifierLaboratoire de Physique Nucléaire et de Hautes Énergies [LPNHE (UMR_7585)]
dc.contributor.authorLENAIN, J.-P.
dc.contributor.authorLESER, E.
dc.contributor.authorLOHSE, T.
hal.structure.identifierInstitut de Recherches sur les lois Fondamentales de l'Univers [IRFU]
dc.contributor.authorLORENTZ, M.
dc.contributor.authorLIU, R.
dc.contributor.authorLÓPEZ-COTO, R.
dc.contributor.authorLYPOVA, I.
dc.contributor.authorMALYSHEV, D.
dc.contributor.authorMARANDON, V.
hal.structure.identifierLaboratoire Univers et Particules de Montpellier [LUPM]
dc.contributor.authorMARCOWITH, Alexandre
hal.structure.identifierLaboratoire Leprince-Ringuet [LLR]
dc.contributor.authorMARIAUD, C.
dc.contributor.authorMARX, R.
hal.structure.identifierLaboratoire d'Annecy de Physique des Particules [LAPP]
dc.contributor.authorMAURIN, G.
dc.contributor.authorMAXTED, N.
dc.contributor.authorMAYER, M.
dc.contributor.authorMEINTJES, P.J.
dc.contributor.authorMEYER, M.
dc.contributor.authorMITCHELL, A.M.W.
dc.contributor.authorMODERSKI, R.
dc.contributor.authorMOHAMED, M.
dc.contributor.authorMOHRMANN, L.
dc.contributor.authorMORÅ, K.
hal.structure.identifierInstitut de Recherches sur les lois Fondamentales de l'Univers [IRFU]
dc.contributor.authorMOULIN, E.
dc.contributor.authorMURACH, T.
dc.contributor.authorNAKASHIMA, S.
hal.structure.identifierLaboratoire Leprince-Ringuet [LLR]
dc.contributor.authorDE NAUROIS, M.
dc.contributor.authorNDIYAVALA, H.
dc.contributor.authorNIEDERWANGER, F.
dc.contributor.authorNIEMIEC, J.
dc.contributor.authorOAKES, L.
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dc.contributor.authorODAKA, H.
dc.contributor.authorOHM, S.
dc.contributor.authorOSTROWSKI, M.
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hal.structure.identifierLaboratoire Univers et Particules de Montpellier [LUPM]
dc.contributor.authorPADOVANI, M.
dc.contributor.authorPANTER, M.
dc.contributor.authorPARSONS, R.D.
dc.contributor.authorPEKEUR, N.W.
hal.structure.identifierInstitut de Planétologie et d'Astrophysique de Grenoble [IPAG]
dc.contributor.authorPELLETIER, G.
hal.structure.identifierLaboratoire de Physique Nucléaire et de Hautes Énergies [LPNHE (UMR_7585)]
dc.contributor.authorPERENNES, C.
hal.structure.identifierInstitut de Planétologie et d'Astrophysique de Grenoble [IPAG]
dc.contributor.authorPETRUCCI, P.-O.
hal.structure.identifierInstitut de Recherches sur les lois Fondamentales de l'Univers [IRFU]
dc.contributor.authorPEYAUD, B.
hal.structure.identifierLaboratoire d'Annecy de Physique des Particules [LAPP]
dc.contributor.authorPIEL, Q.
hal.structure.identifierAstroParticule et Cosmologie [APC (UMR_7164)]
dc.contributor.authorPITA, S.
hal.structure.identifierLaboratoire d'Annecy de Physique des Particules [LAPP]
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dc.contributor.authorPROKOPH, H.
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dc.contributor.authorPUNCH, M.
dc.contributor.authorQUIRRENBACH, A.
dc.contributor.authorRAAB, S.
dc.contributor.authorRAUTH, R.
dc.contributor.authorREIMER, A.
dc.contributor.authorREIMER, O.
hal.structure.identifierLaboratoire Univers et Particules de Montpellier [LUPM]
dc.contributor.authorRENAUD, Matthieu
dc.contributor.authorDE LOS REYES, R.
dc.contributor.authorRIEGER, F.
hal.structure.identifierInstitut de Recherches sur les lois Fondamentales de l'Univers [IRFU]
dc.contributor.authorRINCHIUSO, L.
dc.contributor.authorROMOLI, C.
dc.contributor.authorROWELL, G.
dc.contributor.authorRUDAK, B.
hal.structure.identifierLaboratoire Univers et Théories [LUTH (UMR_8102)]
dc.contributor.authorRULTEN, C.B.
dc.contributor.authorSAHAKIAN, V.
dc.contributor.authorSAITO, S.
hal.structure.identifierLaboratoire d'Annecy de Physique des Particules [LAPP]
dc.contributor.authorSANCHEZ, D.A.
dc.contributor.authorSANTANGELO, A.
dc.contributor.authorSASAKI, M.
dc.contributor.authorSCHLICKEISER, R.
hal.structure.identifierInstitut de Recherches sur les lois Fondamentales de l'Univers [IRFU]
dc.contributor.authorSCHÜSSLER, F.
dc.contributor.authorSCHULZ, A.
dc.contributor.authorSCHWANKE, U.
dc.contributor.authorSCHWEMMER, S.
hal.structure.identifierInstitut de Recherches sur les lois Fondamentales de l'Univers [IRFU]
dc.contributor.authorSEGLAR-ARROYO, M.
dc.contributor.authorSEYFFERT, A.S.
dc.contributor.authorSHAFI, N.
dc.contributor.authorSHILON, I.
dc.contributor.authorSHININGAYAMWE, K.
dc.contributor.authorSIMONI, R.
hal.structure.identifierLaboratoire Univers et Théories [LUTH (UMR_8102)]
dc.contributor.authorSOL, H.
dc.contributor.authorSPANIER, F.
hal.structure.identifierAstroParticule et Cosmologie [APC (UMR_7164)]
dc.contributor.authorSPIR-JACOB, M.
dc.contributor.authorSTAWARZ, L.
dc.contributor.authorSTEENKAMP, R.
dc.contributor.authorSTEGMANN, C.
dc.contributor.authorSTEPPA, C.
dc.contributor.authorSUSHCH, I.
dc.contributor.authorTAKAHASHI, T.
hal.structure.identifierLaboratoire de Physique Nucléaire et de Hautes Énergies [LPNHE (UMR_7585)]
dc.contributor.authorTAVERNET, J.-P.
hal.structure.identifierInstitut de Recherches sur les lois Fondamentales de l'Univers [IRFU]
dc.contributor.authorTAVERNIER, T.
dc.contributor.authorTAYLOR, A.M.
hal.structure.identifierAstroParticule et Cosmologie [APC (UMR_7164)]
dc.contributor.authorTERRIER, R.
dc.contributor.authorTIBALDO, L.
dc.contributor.authorTIZIANI, D.
dc.contributor.authorTLUCZYKONT, M.
hal.structure.identifierCentre de Physique des Particules de Marseille [CPPM]
dc.contributor.authorTRICHARD, C.
hal.structure.identifierLaboratoire Univers et Particules de Montpellier [LUPM]
dc.contributor.authorTSIROU, M.
dc.contributor.authorTSUJI, N.
dc.contributor.authorTUFFS, R.
dc.contributor.authorUCHIYAMA, Y.
dc.contributor.authorVAN DER WALT, D.J.
dc.contributor.authorVAN ELDIK, C.
dc.contributor.authorVAN RENSBURG, C.
dc.contributor.authorVAN SOELEN, B.
hal.structure.identifierLaboratoire Univers et Particules de Montpellier [LUPM]
dc.contributor.authorVASILEIADIS, George
dc.contributor.authorVEH, J.
dc.contributor.authorVENTER, C.
dc.contributor.authorVIANA, A.
hal.structure.identifierLaboratoire de Physique Nucléaire et de Hautes Énergies [LPNHE (UMR_7585)]
dc.contributor.authorVINCENT, P.
dc.contributor.authorVINK, J.
dc.contributor.authorVOISIN, F.
dc.contributor.authorVÖLK, H.J.
hal.structure.identifierLaboratoire d'Annecy de Physique des Particules [LAPP]
dc.contributor.authorVUILLAUME, T.
dc.contributor.authorWADIASINGH, Z.
dc.contributor.authorWAGNER, S.J.
dc.contributor.authorWAGNER, P.
dc.contributor.authorWAGNER, R.M.
dc.contributor.authorWHITE, R.
dc.contributor.authorWIERZCHOLSKA, A.
dc.contributor.authorWILLMANN, P.
dc.contributor.authorWÖRNLEIN, A.
hal.structure.identifierInstitut de Recherches sur les lois Fondamentales de l'Univers [IRFU]
dc.contributor.authorWOUTERS, D.
dc.contributor.authorYANG, R.
hal.structure.identifierLaboratoire Leprince-Ringuet [LLR]
dc.contributor.authorZABOROV, D.
dc.contributor.authorZACHARIAS, M.
dc.contributor.authorZANIN, R.
dc.contributor.authorZDZIARSKI, A.A.
hal.structure.identifierLaboratoire Univers et Théories [LUTH (UMR_8102)]
dc.contributor.authorZECH, A.
hal.structure.identifierLaboratoire Leprince-Ringuet [LLR]
dc.contributor.authorZEFI, F.
dc.contributor.authorZIEGLER, A.
dc.contributor.authorZORN, J.
dc.contributor.authorŻYWUCKA, N.
dc.contributor.authorMAGILL, J.D.
dc.contributor.authorBUSON, S.
dc.contributor.authorCHEUNG, C.C.
dc.contributor.authorPERKINS, J.S.
dc.contributor.authorTANAKA, Y.
dc.date.issued2018
dc.identifier.issn0004-6361
dc.description.abstractEnCentaurus A (Cen A) is the nearest radio galaxy discovered as a very-high-energy (VHE; 100 GeV–100 TeV) γ-ray source by the High Energy Stereoscopic System (H.E.S.S.). It is a faint VHE γ-ray emitter, though its VHE flux exceeds both the extrapolation from early Fermi-LAT observations as well as expectations from a (misaligned) single-zone synchrotron-self Compton (SSC) description. The latter satisfactorily reproduces the emission from Cen A at lower energies up to a few GeV. New observations with H.E.S.S., comparable in exposure time to those previously reported, were performed and eight years of Fermi-LAT data were accumulated to clarify the spectral characteristics of the γ-ray emission from the core of Cen A. The results allow us for the first time to achieve the goal of constructing a representative, contemporaneous γ-ray core spectrum of Cen A over almost five orders of magnitude in energy. Advanced analysis methods, including the template fitting method, allow detection in the VHE range of the core with a statistical significance of 12σ on the basis of 213 hours of total exposure time. The spectrum in the energy range of 250 GeV–6 TeV is compatible with a power-law function with a photon index Γ = 2.52 ± 0.13stat ± 0.20sys. An updated Fermi-LAT analysis provides evidence for spectral hardening by ΔΓ ≃ 0.4 ± 0.1 at γ-ray energies above 2.8+1.0−0.6 GeV at a level of 4.0σ. The fact that the spectrum hardens at GeV energies and extends into the VHE regime disfavour a single-zone SSC interpretation for the overall spectral energy distribution (SED) of the core and is suggestive of a new γ-ray emitting component connecting the high-energy emission above the break energy to the one observed at VHE energies. The absence of significant variability at both GeV and TeV energies does not yet allow disentanglement of the physical nature of this component, though a jet-related origin is possible and a simple two-zone SED model fit is provided to this end.Key words: gamma rays: galaxies / radiation mechanisms: non-thermal⋆ Corresponding author: H.E.S.S. and LAT Collaborations, e-mail: contact.hess@hess-experiment.eu; jmagill@umd.edu.† Funded by EU FP7 Marie Curie, grant agreement No. PIEF-GA-2012-332350.
dc.language.isoen
dc.publisherEDP Sciences
dc.subject.engamma rays: galaxies
dc.subject.enradiation mechanisms: non-thermal
dc.subject.enenergy: high
dc.subject.engalaxy: radio wave
dc.subject.engamma ray: VHE
dc.subject.enGLAST
dc.subject.enspectral
dc.subject.enHESS
dc.subject.enenergy spectrum
dc.subject.engamma ray: energy spectrum
dc.subject.enstatistical
dc.subject.enphoton
dc.subject.enflux
dc.title.enThe $\gamma$-ray spectrum of the core of Centaurus A as observed with H.E.S.S. and Fermi-LAT
dc.typeArticle de revue
dc.identifier.doi10.1051/0004-6361/201832640
dc.subject.halPhysique [physics]/Astrophysique [astro-ph]
dc.identifier.arxiv1807.07375
bordeaux.journalAstronomy and Astrophysics - A&A
bordeaux.pageA71
bordeaux.volume619
bordeaux.peerReviewedoui
hal.identifierhal-01867378
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-01867378v1
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