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000399131 005__ 20250717103401.0
000399131 0247_ $$2doi$$a10.1093/mnras/stx2079
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000399131 0247_ $$2ISSN$$a1365-2966
000399131 0247_ $$2arXiv$$aarXiv:1707.01583
000399131 0247_ $$2datacite_doi$$a10.3204/PUBDB-2018-00436
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000399131 041__ $$aEnglish
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000399131 0881_ $$aarXiv:1707.01583
000399131 088__ $$2arXiv$$aarXiv:1707.01583
000399131 1001_ $$0INSPIRE-00488763$$aAhnen, M. L.$$b0
000399131 245__ $$aA cut-off in the TeV gamma-ray spectrum of the SNR Cassiopeia A
000399131 260__ $$aOxford$$bOxford Univ. Press$$c2017
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000399131 500__ $$a(c) The Authors
000399131 520__ $$aIt is widely believed that the bulk of the Galactic cosmic rays is accelerated in supernova remnants (SNRs). However, no observational evidence of the presence of particles of PeV energies in SNRs has yet been found. The young historical SNR Cassiopeia A (Cas A) appears as one of the best candidates to study acceleration processes. Between 2014 December and 2016 October, we observed Cas A with the MAGIC telescopes, accumulating 158 h of good quality data. We derived the spectrum of the source from 100 GeV to 10 TeV. We also analysed ∼8 yr of Fermi-LAT to obtain the spectral shape between 60 MeV and 500 GeV. The spectra measured by the LAT and MAGIC telescopes are compatible within the errors and show a clear turn-off (4.6σ) at the highest energies, which can be described with an exponential cut-off at $E_c = 3.5(^{+1.6}_{-1.0})_{{\rm stat}} (^{+0.8}_{-0.9})_{{\rm sys}}$ TeV. The gamma-ray emission from 60 MeV to 10 TeV can be attributed to a population of high-energy protons with a spectral index of ∼2.2 and an energy cut-off at ∼10 TeV. This result indicates that Cas A is not contributing to the high energy (∼PeV) cosmic ray sea in a significant manner at the present moment. A one-zone leptonic model fails to reproduce by itself the multiwavelength spectral energy distribution. Besides, if a non-negligible fraction of the flux seen by MAGIC is produced by leptons, the radiation should be emitted in a region with a low magnetic field (B⪅180 μG) like in the reverse shock.
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000399131 650_7 $$2INSPIRE$$aenergy: high
000399131 650_7 $$2INSPIRE$$agamma ray: emission
000399131 650_7 $$2INSPIRE$$agamma ray: energy spectrum
000399131 650_7 $$2INSPIRE$$acosmic radiation: galaxy
000399131 650_7 $$2INSPIRE$$amagnetic field: low
000399131 650_7 $$2INSPIRE$$amodel: leptonic
000399131 650_7 $$2INSPIRE$$aMAGIC
000399131 650_7 $$2INSPIRE$$aspectral
000399131 650_7 $$2INSPIRE$$ap
000399131 650_7 $$2INSPIRE$$apower spectrum
000399131 650_7 $$2INSPIRE$$aacceleration
000399131 650_7 $$2INSPIRE$$asupernova
000399131 650_7 $$2INSPIRE$$alepton
000399131 650_7 $$2INSPIRE$$amoment
000399131 650_7 $$2INSPIRE$$aflux
000399131 650_7 $$2INSPIRE$$aGLAST
000399131 650_7 $$2INSPIRE$$aenergy spectrum
000399131 693__ $$0EXP:(DE-H253)MAGIC-20170101$$5EXP:(DE-H253)MAGIC-20170101$$eMajor Atmospheric Gamma Imaging Cherenkov$$x0
000399131 7001_ $$0INSPIRE-00062352$$aAnsoldi, S.$$b1
000399131 7001_ $$0INSPIRE-00300731$$aAntonelli, L. A.$$b2
000399131 7001_ $$0INSPIRE-00488770$$aArcaro, C.$$b3
000399131 7001_ $$0INSPIRE-00377407$$aBabić, A.$$b4
000399131 7001_ $$0INSPIRE-00488782$$aBanerjee, B.$$b5
000399131 7001_ $$0INSPIRE-00488794$$aBangale, P.$$b6
000399131 7001_ $$0INSPIRE-00571806$$aBarres de Almeida, U.$$b7
000399131 7001_ $$0INSPIRE-00300761$$aBarrio, J. A.$$b8
000399131 7001_ $$0INSPIRE-00300771$$aBecerra González, J.$$b9
000399131 7001_ $$0INSPIRE-00300791$$aBednarek, W.$$b10
000399131 7001_ $$0P:(DE-H253)PIP1003794$$aBernardini, E.$$b11
000399131 7001_ $$0INSPIRE-00488806$$aBerti, A.$$b12
000399131 7001_ $$0P:(DE-H253)PIP1028466$$aBhattacharyya, W.$$b13
000399131 7001_ $$aBiasuzzi, B.$$b14
000399131 7001_ $$0INSPIRE-00300829$$aBiland, A.$$b15
000399131 7001_ $$0INSPIRE-00142016$$aBlanch, O.$$b16
000399131 7001_ $$0P:(DE-HGF)0$$aBonnefoy, S.$$b17
000399131 7001_ $$0INSPIRE-00300846$$aBonnoli, G.$$b18
000399131 7001_ $$0INSPIRE-00071241$$aCarosi, R.$$b19
000399131 7001_ $$0INSPIRE-00306452$$aCarosi, A.$$b20
000399131 7001_ $$0INSPIRE-00488831$$aChatterjee, A.$$b21
000399131 7001_ $$0INSPIRE-00488843$$aColak, M.$$b22
000399131 7001_ $$0INSPIRE-00141958$$aColin, P.$$b23
000399131 7001_ $$0INSPIRE-00150186$$aColombo, E.$$b24
000399131 7001_ $$0INSPIRE-00141343$$aContreras, J. L.$$b25
000399131 7001_ $$0INSPIRE-00141579$$aCortina, J.$$b26
000399131 7001_ $$0INSPIRE-00142620$$aCovino, S.$$b27
000399131 7001_ $$0INSPIRE-00546807$$aCumani, P.$$b28
000399131 7001_ $$0INSPIRE-00488850$$aDa Vela, P.$$b29
000399131 7001_ $$0INSPIRE-00141596$$aDazzi, F.$$b30
000399131 7001_ $$0INSPIRE-00062269$$aDe Angelis, A.$$b31
000399131 7001_ $$0INSPIRE-00102726$$aDe Lotto, B.$$b32
000399131 7001_ $$0P:(DE-HGF)0$$ade Oña Wilhelmi, E.$$b33$$eCorresponding author
000399131 7001_ $$0INSPIRE-00384304$$aDi Pierro, F.$$b34
000399131 7001_ $$0INSPIRE-00327021$$aDoert, M.$$b35
000399131 7001_ $$0INSPIRE-00141394$$aDomínguez, A.$$b36
000399131 7001_ $$0INSPIRE-00143036$$aDominis Prester, D.$$b37
000399131 7001_ $$0INSPIRE-00254552$$aDorner, D.$$b38
000399131 7001_ $$0INSPIRE-00141532$$aDoro, M.$$b39
000399131 7001_ $$0INSPIRE-00488871$$aEinecke, S.$$b40
000399131 7001_ $$0INSPIRE-00488889$$aEisenacher Glawion, D.$$b41
000399131 7001_ $$0INSPIRE-00143003$$aElsaesser, D.$$b42
000399131 7001_ $$0INSPIRE-00488898$$aEngelkemeier, M.$$b43
000399131 7001_ $$0INSPIRE-00488904$$aFallah Ramazani, V.$$b44
000399131 7001_ $$0INSPIRE-00488910$$aFernández-Barral, A.$$b45
000399131 7001_ $$0INSPIRE-00488920$$aFidalgo, D.$$b46
000399131 7001_ $$0INSPIRE-00141567$$aFonseca, M. V.$$b47
000399131 7001_ $$0INSPIRE-00142087$$aFont, L.$$b48
000399131 7001_ $$0INSPIRE-00488931$$aFruck, C.$$b49
000399131 7001_ $$0INSPIRE-00488943$$aGalindo, D.$$b50$$eCorresponding author
000399131 7001_ $$0INSPIRE-00142208$$aGarcía López, R. J.$$b51
000399131 7001_ $$0P:(DE-H253)PIP1019066$$aGarczarczyk, Markus$$b52$$udesy
000399131 7001_ $$0INSPIRE-00141635$$aGaug, M.$$b53
000399131 7001_ $$0INSPIRE-00488950$$aGiammaria, P.$$b54
000399131 7001_ $$0INSPIRE-00085321$$aGodinović, N.$$b55
000399131 7001_ $$0P:(DE-H253)PIP1013218$$aGora, D.$$b56
000399131 7001_ $$0INSPIRE-00488965$$aGuberman, D.$$b57$$eCorresponding author
000399131 7001_ $$0INSPIRE-00142092$$aHadasch, D.$$b58
000399131 7001_ $$0INSPIRE-00488972$$aHahn, A.$$b59
000399131 7001_ $$0INSPIRE-00488981$$aHassan, T.$$b60
000399131 7001_ $$0INSPIRE-00142353$$aHayashida, M.$$b61
000399131 7001_ $$0INSPIRE-00488999$$aHerrera, J.$$b62
000399131 7001_ $$0INSPIRE-00142364$$aHose, J.$$b63
000399131 7001_ $$0INSPIRE-00141466$$aHrupec, D.$$b64
000399131 7001_ $$aInada, T.$$b65
000399131 7001_ $$0INSPIRE-00489008$$aIshio, K.$$b66
000399131 7001_ $$0INSPIRE-00489015$$aKonno, Y.$$b67
000399131 7001_ $$0INSPIRE-00640533$$aKubo, H.$$b68
000399131 7001_ $$0INSPIRE-00489031$$aKushida, J.$$b69
000399131 7001_ $$0INSPIRE-00489043$$aKuveždić, D.$$b70
000399131 7001_ $$0INSPIRE-00191465$$aLelas, D.$$b71
000399131 7001_ $$0INSPIRE-00142893$$aLindfors, E.$$b72
000399131 7001_ $$0INSPIRE-00142556$$aLombardi, S.$$b73
000399131 7001_ $$0INSPIRE-00142977$$aLongo, F.$$b74
000399131 7001_ $$0INSPIRE-00301468$$aLópez, M.$$b75
000399131 7001_ $$0INSPIRE-00489055$$aMaggio, C.$$b76
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000399131 7001_ $$0INSPIRE-00141046$$aManeva, G.$$b79
000399131 7001_ $$0INSPIRE-00489062$$aManganaro, M.$$b80
000399131 7001_ $$0INSPIRE-00142889$$aMannheim, K.$$b81
000399131 7001_ $$0INSPIRE-00142644$$aMaraschi, L.$$b82
000399131 7001_ $$0INSPIRE-00141627$$aMariotti, M.$$b83
000399131 7001_ $$0INSPIRE-00139242$$aMartínez, M.$$b84
000399131 7001_ $$0INSPIRE-00141305$$aMazin, D.$$b85
000399131 7001_ $$0INSPIRE-00489073$$aMenzel, U.$$b86
000399131 7001_ $$0INSPIRE-00489083$$aMinev, M.$$b87
000399131 7001_ $$0INSPIRE-00142403$$aMirzoyan, R.$$b88
000399131 7001_ $$0INSPIRE-00044045$$aMoralejo, A.$$b89
000399131 7001_ $$0INSPIRE-00489097$$aMoreno, V.$$b90
000399131 7001_ $$0INSPIRE-00239778$$aMoretti, E.$$b91
000399131 7001_ $$0INSPIRE-00489117$$aNeustroev, V.$$b92
000399131 7001_ $$aNiedzwiecki, A.$$b93
000399131 7001_ $$0INSPIRE-00545905$$aNievas Rosillo, M.$$b94
000399131 7001_ $$0INSPIRE-00142900$$aNilsson, K.$$b95
000399131 7001_ $$0INSPIRE-00522762$$aNinci, D.$$b96
000399131 7001_ $$0INSPIRE-00547990$$aNishijima, K.$$b97
000399131 7001_ $$0INSPIRE-00489133$$aNoda, K.$$b98
000399131 7001_ $$0INSPIRE-00647607$$aNogués, L.$$b99
000399131 7001_ $$0INSPIRE-00489144$$aPaiano, S.$$b100
000399131 7001_ $$0INSPIRE-00381228$$aPalacio, J.$$b101
000399131 7001_ $$0INSPIRE-00143659$$aPaneque, D.$$b102
000399131 7001_ $$0INSPIRE-00142718$$aPaoletti, R.$$b103
000399131 7001_ $$0INSPIRE-00141093$$aParedes, J. M.$$b104
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000399131 7001_ $$aPeresano, M.$$b106
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000399131 7001_ $$0INSPIRE-00142731$$aPrada Moroni, P. G.$$b109
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000399131 7001_ $$0INSPIRE-00143210$$aPuljak, I.$$b111
000399131 7001_ $$0INSPIRE-00489170$$aGarcia, J. R.$$b112
000399131 7001_ $$0INSPIRE-00141111$$aReichardt, I.$$b113
000399131 7001_ $$0INSPIRE-00119851$$aRhode, W.$$b114
000399131 7001_ $$0INSPIRE-00142110$$aRibó, M.$$b115
000399131 7001_ $$0INSPIRE-00120041$$aRico, J.$$b116
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000399131 7001_ $$0INSPIRE-00489217$$aStrzys, M.$$b127
000399131 7001_ $$0INSPIRE-00143520$$aSurić, T.$$b128
000399131 7001_ $$0INSPIRE-00142935$$aTakalo, L.$$b129
000399131 7001_ $$0INSPIRE-00142680$$aTavecchio, F.$$b130
000399131 7001_ $$0INSPIRE-00141037$$aTemnikov, P.$$b131
000399131 7001_ $$0INSPIRE-00143538$$aTerzić, T.$$b132
000399131 7001_ $$0INSPIRE-00142068$$aTescaro, D.$$b133
000399131 7001_ $$0INSPIRE-00141284$$aTeshima, M.$$b134
000399131 7001_ $$0INSPIRE-00643016$$aTorres-Albà, N.$$b135
000399131 7001_ $$aTreves, A.$$b136
000399131 7001_ $$0INSPIRE-00489235$$aVanzo, G.$$b137
000399131 7001_ $$0INSPIRE-00052834$$aVazquez Acosta, M.$$b138
000399131 7001_ $$0INSPIRE-00489245$$aVovk, I.$$b139
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000399131 7001_ $$0INSPIRE-00489253$$aZarić, D.$$b142
000399131 7001_ $$0P:(DE-HGF)0$$aMAGIC Collaboration$$b143$$eCollaboration author
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