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Resolving the Extragalactic $\gamma$-Ray Background above 50 GeV with the Fermi Large Area Telescope

dc.contributor.authorACKERMANN, M.
dc.contributor.authorAJELLO, M.
dc.contributor.authorALBERT, A.
dc.contributor.authorATWOOD, W.B.
dc.contributor.authorBALDINI, L.
hal.structure.identifierDépartement de Physique des Particules (ex SPP) [DPhP]
dc.contributor.authorBALLET, J.
dc.contributor.authorBARBIELLINI, G.
dc.contributor.authorBASTIERI, D.
dc.contributor.authorBECHTOL, K.
dc.contributor.authorBELLAZZINI, R.
dc.contributor.authorBISSALDI, E.
dc.contributor.authorBLANDFORD, R.D.
dc.contributor.authorBLOOM, E.D.
dc.contributor.authorBONINO, R.
hal.structure.identifierLaboratoire Univers et Particules de Montpellier [LUPM]
dc.contributor.authorBREGEON, J.
dc.contributor.authorBRITTO, R.J.
hal.structure.identifierLaboratoire Leprince-Ringuet [LLR]
dc.contributor.authorBRUEL, P.
dc.contributor.authorBUEHLER, R.
dc.contributor.authorCALIANDRO, G.A.
dc.contributor.authorCAMERON, R.A.
dc.contributor.authorCARAGIULO, M.
dc.contributor.authorCARAVEO, P.A.
dc.contributor.authorCAVAZZUTI, E.
dc.contributor.authorCECCHI, C.
dc.contributor.authorCHARLES, E.
dc.contributor.authorCHEKHTMAN, A.
dc.contributor.authorCHIANG, J.
dc.contributor.authorCHIARO, G.
dc.contributor.authorCIPRINI, S.
hal.structure.identifierLaboratoire Univers et Particules de Montpellier [LUPM]
dc.contributor.authorCOHEN-TANUGI, Johann
dc.contributor.authorCOMINSKY, L.R.
dc.contributor.authorCOSTANZA, F.
dc.contributor.authorCUTINI, S.
dc.contributor.authorD'AMMANDO, F.
dc.contributor.authorDE ANGELIS, A.
dc.contributor.authorDE PALMA, F.
dc.contributor.authorDESIANTE, R.
dc.contributor.authorDIGEL, S.W.
dc.contributor.authorDI MAURO, M.
dc.contributor.authorDI VENERE, L.
dc.contributor.authorDOMINGUEZ, A.
dc.contributor.authorDRELL, P.S.
dc.contributor.authorFAVUZZI, C.
hal.structure.identifierLaboratoire Leprince-Ringuet [LLR]
dc.contributor.authorFEGAN, S.J.
dc.contributor.authorFERRARA, E.C.
dc.contributor.authorFRANCKOWIAK, A.
dc.contributor.authorFUKAZAWA, Y.
dc.contributor.authorFUNK, S.
dc.contributor.authorFUSCO, P.
dc.contributor.authorGARGANO, F.
dc.contributor.authorGASPARRINI, D.
dc.contributor.authorGIGLIETTO, N.
dc.contributor.authorGIOMMI, P.
dc.contributor.authorGIORDANO, F.
dc.contributor.authorGIROLETTI, M.
dc.contributor.authorGODFREY, G.
dc.contributor.authorGREEN, D.
hal.structure.identifierDépartement de Physique des Particules (ex SPP) [DPhP]
dc.contributor.authorGRENIER, I.A.
dc.contributor.authorGUIRIEC, S.
dc.contributor.authorHAYS, E.
hal.structure.identifierLaboratoire Leprince-Ringuet [LLR]
dc.contributor.authorHORAN, D.
dc.contributor.authorIAFRATE, G.
dc.contributor.authorJOGLER, T.
dc.contributor.authorJOHANNESSON, G.
dc.contributor.authorKUSS, M.
dc.contributor.authorLA MURA, G.
dc.contributor.authorLARSSON, S.
dc.contributor.authorLATRONICO, L.
dc.contributor.authorLI, J.
dc.contributor.authorLI, L.
dc.contributor.authorLONGO, F.
dc.contributor.authorLOPARCO, F.
hal.structure.identifierCentre d'Etudes Nucléaires de Bordeaux Gradignan [CENBG]
dc.contributor.authorLOTT, B.
dc.contributor.authorLOVELLETTE, M.N.
dc.contributor.authorLUBRANO, P.
dc.contributor.authorMADEJSKI, G.M.
dc.contributor.authorMAGILL, J.
dc.contributor.authorMALDERA, S.
dc.contributor.authorMANFREDA, A.
dc.contributor.authorMAYER, M.
dc.contributor.authorMAZZIOTTA, M.N.
dc.contributor.authorMICHELSON, P.F.
dc.contributor.authorMITTHUMSIRI, W.
dc.contributor.authorMIZUNO, T.
dc.contributor.authorMOISEEV, A.A.
dc.contributor.authorMONZANI, M.E.
dc.contributor.authorMORSELLI, A.
dc.contributor.authorMOSKALENKO, I.V.
dc.contributor.authorMURGIA, S.
dc.contributor.authorNEGRO, M.
hal.structure.identifierLaboratoire Univers et Particules de Montpellier [LUPM]
dc.contributor.authorNUSS, E.
dc.contributor.authorOHSUGI, T.
dc.contributor.authorOKADA, C.
dc.contributor.authorOMODEI, N.
dc.contributor.authorORLANDO, E.
dc.contributor.authorORMES, J.F.
dc.contributor.authorPANEQUE, D.
dc.contributor.authorPERKINS, J.S.
dc.contributor.authorPESCE-ROLLINS, M.
dc.contributor.authorPETROSIAN, V.
hal.structure.identifierLaboratoire Univers et Particules de Montpellier [LUPM]
dc.contributor.authorPIRON, F.
dc.contributor.authorPIVATO, G.
dc.contributor.authorPORTER, T.A.
dc.contributor.authorRAINO, S.
dc.contributor.authorRANDO, R.
dc.contributor.authorRAZZANO, M.
dc.contributor.authorRAZZAQUE, S.
dc.contributor.authorREIMER, A.
dc.contributor.authorREIMER, O.
hal.structure.identifierCentre d'Etudes Nucléaires de Bordeaux Gradignan [CENBG]
dc.contributor.authorREPOSEUR, T.
dc.contributor.authorROMANI, R.W.
dc.contributor.authorSANCHEZ-CONDE, M.
hal.structure.identifierDépartement de Physique des Particules (ex SPP) [DPhP]
dc.contributor.authorSCHMID, J.
dc.contributor.authorSCHULZ, A.
dc.contributor.authorSGRO, C.
dc.contributor.authorSIMONE, D.
dc.contributor.authorSISKIND, E.J.
dc.contributor.authorSPADA, F.
dc.contributor.authorSPANDRE, G.
dc.contributor.authorSPINELLI, P.
dc.contributor.authorSUSON, D.J.
dc.contributor.authorTAKAHASHI, H.
dc.contributor.authorTHAYER, J.B.
dc.contributor.authorTIBALDO, L.
dc.contributor.authorTORRES, D.F.
dc.contributor.authorTROJA, E.
dc.contributor.authorVIANELLO, G.
hal.structure.identifierLaboratoire Univers et Particules de Montpellier [LUPM]
dc.contributor.authorYASSINE, M.
dc.contributor.authorZIMMER, S.
dc.date.issued2016
dc.identifier.issn0031-9007
dc.description.abstractEnThe Fermi Large Area Telescope (LAT) Collaboration has recently released a catalog of 360 sources detected above 50 GeV (2FHL). This catalog was obtained using 80 months of data re-processed with Pass 8, the newest event-level analysis, which significantly improves the acceptance and angular resolution of the instrument. Most of the 2FHL sources at high Galactic latitude are blazars. Using detailed Monte Carlo simulations, we measure, for the first time, the source count distribution, dN/dS, of extragalactic γ-ray sources at E>50  GeV and find that it is compatible with a Euclidean distribution down to the lowest measured source flux in the 2FHL (∼8×10-12  ph cm-2 s-1). We employ a one-point photon fluctuation analysis to constrain the behavior of dN/dS below the source detection threshold. Overall, the source count distribution is constrained over three decades in flux and found compatible with a broken power law with a break flux, Sb, in the range [8×10-12,1.5×10-11]  ph cm-2 s-1 and power-law indices below and above the break of α2∈[1.60,1.75] and α1=2.49±0.12, respectively. Integration of dN/dS shows that point sources account for at least 86-14+16% of the total extragalactic γ-ray background. The simple form of the derived source count distribution is consistent with a single population (i.e., blazars) dominating the source counts to the minimum flux explored by this analysis. We estimate the density of sources detectable in blind surveys that will be performed in the coming years by the Cherenkov Telescope Array.
dc.language.isoen
dc.publisherAmerican Physical Society
dc.subject.enphoton: fluctuation
dc.subject.enflux: energy dependence
dc.subject.enbackground
dc.subject.enblazar: energy spectrum
dc.subject.enCherenkov Telescope Array
dc.subject.enangular resolution
dc.subject.enMonte Carlo
dc.subject.enacceptance
dc.subject.enEuclidean
dc.subject.engamma ray: emission
dc.subject.engalaxy
dc.subject.enGLAST
dc.title.enResolving the Extragalactic $\gamma$-Ray Background above 50 GeV with the Fermi Large Area Telescope
dc.typeArticle de revue
dc.identifier.doi10.1103/PhysRevLett.116.151105
dc.subject.halPhysique [physics]/Astrophysique [astro-ph]
dc.identifier.arxiv1511.00693
bordeaux.journalPhysical Review Letters
bordeaux.page151105
bordeaux.volume116
bordeaux.issue15
bordeaux.peerReviewedoui
hal.identifierhal-01555001
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-01555001v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Physical%20Review%20Letters&rft.date=2016&rft.volume=116&rft.issue=15&rft.spage=151105&rft.epage=151105&rft.eissn=0031-9007&rft.issn=0031-9007&rft.au=ACKERMANN,%20M.&AJELLO,%20M.&ALBERT,%20A.&ATWOOD,%20W.B.&BALDINI,%20L.&rft.genre=article


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