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A cut-off in the TeV gamma-ray spectrum of the SNR Cassiopeia A

dc.contributor.authorBarrio Uña, Juan Abel
dc.contributor.authorBonnefoy, Simon Francois Albert
dc.contributor.authorContreras González, José Luis
dc.contributor.authorDomínguez-Adame Acosta, Francisco
dc.contributor.authorFidalgo, David
dc.contributor.authorFonseca González, María Victoria
dc.contributor.authorLópez Moya, Marcos
dc.contributor.authorNievas Rosillo, Mireia
dc.date.accessioned2023-06-17T22:18:42Z
dc.date.available2023-06-17T22:18:42Z
dc.date.issued2017-12
dc.description© The Authors. Artículo firmado por más de diez autores. We would like to thank the Instituto de Astrofísica de Canarias for the excellent working conditions at the Observatorio del Roque de los Muchachos in La Palma. The financial support of the German BMBF and MPG, the Italian INFN and INAF, the Swiss National Fund SNF, the ERDF under the Spanish MINECO (FPA2015- 69818-P, FPA2012-36668, FPA2015-68378-P, FPA2015- 69210-C6-2-R, FPA2015-69210-C6-4-R, FPA2015-69210-C6- 6-R, AYA2015-71042-P, AYA2016-76012-C3-1-P, ESP2015- 71662-C2-2-P, CSD2009-00064), and the Japanese JSPS and MEXT is gratefully acknowledged. This work was also supported by the Spanish Centro de Excelencia “Severo Ochoa” SEV-2012-0234 and SEV-2015-0548, and Unidad de Excelencia “Mar´ıa de Maeztu” MDM-2014-0369, by the Croatian Science Foundation (HrZZ) Project 09/176 and the University of Rijeka Project 13.12.1.3.02, by the DFG Collaborative Research Centers SFB823/C4 and SFB876/C3, and by the Polish MNiSzW grant 745/N-HESS-MAGIC/2010/0.
dc.description.abstractIt is widely believed that the bulk of the Galactic cosmic rays are 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 December 2014 and October 2016 we observed Cas A with the MAGIC telescopes, accumulating 158 hours of good-quality data. We derived the spectrum of the source from 100 GeV to 10 TeV. We also analysed ∼8 years of F ermiLAT 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 (4.6 σ) at the highest energies, which can be described with an exponential cut-off at Ec = 3.5(₋₁‚₀⁺¹’⁶ )_(stat) (⁺⁰’⁸ ₋‚₀₉)_(sys) TeV. The gamma-ray emission from 60 MeV to 10 TeV can be attributed to a population of high-energy protons with spectral index ∼2.2 and 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<≈100µG) like in the reverse shock.
dc.description.departmentDepto. de Estructura de la Materia, Física Térmica y Electrónica
dc.description.facultyFac. de Ciencias Físicas
dc.description.refereedTRUE
dc.description.sponsorshipMinisterio de Economía y Competitividad (MINECO)
dc.description.sponsorshipItalian INFN
dc.description.sponsorshipGerman BMBF
dc.description.sponsorshipGerman MPG
dc.description.sponsorshipItalian INAF
dc.description.sponsorshipSwiss National Fund (SNF)
dc.description.sponsorshipSpanish Centro de Excelencia 'Severo Ochoa
dc.description.sponsorshipUnidad de Excelencia 'Maria de Maeztu'
dc.description.sponsorshipCroatian Science Foundation (HrZZ) Project
dc.description.sponsorshipUniversity of Rijeka Project
dc.description.sponsorshipDFG Collaborative Research Centers
dc.description.sponsorshipPolish MNiSzW grant
dc.description.statuspub
dc.eprint.idhttps://eprints.ucm.es/id/eprint/46254
dc.identifier.doi10.1093/mnras/stx2079
dc.identifier.issn0035-8711
dc.identifier.officialurlhttp://dx.doi.org/10.1093/mnras/stx2079
dc.identifier.relatedurlhttps://academic.oup.com
dc.identifier.urihttps://hdl.handle.net/20.500.14352/18357
dc.issue.number3
dc.journal.titleMonthly notices of the royal astronomical society
dc.language.isoeng
dc.page.final2962
dc.page.initial2956
dc.publisherWiley
dc.relation.projectIDFPA2015-69818-P
dc.relation.projectIDFPA2012-36668
dc.relation.projectIDFPA2015-68378-P
dc.relation.projectIDFPA2015-69210-C6-2-R
dc.relation.projectIDFPA2015-69210-C6-4-R
dc.relation.projectIDFPA2015-69210-C6-6-R
dc.relation.projectIDAYA2015-71042-P
dc.relation.projectIDAYA201676012-C3-1-P
dc.relation.projectIDESP2015-71662-C2-2-P
dc.relation.projectIDCSD2009-00064
dc.relation.projectIDSEV-2012-0234
dc.relation.projectIDSEV-2015-0548
dc.relation.projectIDMDM-2014-0369
dc.relation.projectID09/176
dc.relation.projectID13.12.1.3.02
dc.relation.projectIDSFB823/C4
dc.relation.projectIDSFB876/C3
dc.relation.projectID745/N-HESS-MAGIC/2010/0
dc.rights.accessRightsopen access
dc.subject.cdu539.1
dc.subject.keywordGamma rays: general
dc.subject.keywordCosmic ray physics
dc.subject.keywordStars: supernovae: individual: Cassiopeia A
dc.subject.keywordSupernova remnants
dc.subject.keywordAcceleration of particles
dc.subject.ucmElectricidad
dc.subject.ucmElectrónica (Física)
dc.subject.ucmFísica nuclear
dc.subject.unesco2202.03 Electricidad
dc.subject.unesco2207 Física Atómica y Nuclear
dc.titleA cut-off in the TeV gamma-ray spectrum of the SNR Cassiopeia A
dc.typejournal article
dc.volume.number472
dspace.entity.typePublication
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relation.isAuthorOfPublication.latestForDiscovery11e5fd8b-1a86-4f8d-85c6-135541232be4

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