Contemporaneous observations of the radio galaxy NGC 1275 from radio to very high energy gamma-rays

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dc.contributor.authorAntoranz Canales, Pedro
dc.contributor.authorBarrio Uña, Juan Abel
dc.contributor.authorContreras González, José Luis
dc.contributor.authorFonseca González, Mª Victoria
dc.contributor.authorLópez Moya, Marcos
dc.contributor.authorMiranda Pantoja, José Miguel
dc.contributor.authorSatalecka, Konstanzja
dc.contributor.authorScapin, Valeria
dc.date.accessioned2023-06-19T13:25:18Z
dc.date.available2023-06-19T13:25:18Z
dc.date.issued2014-04
dc.description© ESO, 2014.
dc.description.abstractAims. The radio galaxy NGC 1275, recently identified as a very high energy (VHE, >100 GeV) gamma-ray emitter by MAGIC, is one of the few non-blazar active galactic nuclei detected in the VHE regime. The purpose of this work is to better understand the origin of the gamma-ray emission and locate it within the galaxy. Methods. We studied contemporaneous multifrequency observations of NGC 1275 and modeled the overall spectral energy distribution. We analyzed unpublished MAGIC observations carried out between October 2009 and February 2010, and the previously published observations taken between August 2010 and February 2011. We studied the multiband variability and correlations by analyzing data of Fermi-LAT in the 100 MeV-100 GeV energy band, as well as Chandra (X-ray), KVA (optical), and MOJAVE (radio) data taken during the same period. Results. Using customized Monte Carlo simulations corresponding to early MAGIC stereoscopic data, we detect NGC 1275 also in the earlier MAGIC campaign. The flux level and energy spectra are similar to the results of the second campaign. The monthly light curse above 100 GeV shows a hint of variability at the 3.6 sigma level. In the Fermi-LAT hand, both flux and spectral shape variabilities are reported. The optical light curve is also variable and shows a clear correlation with the gamma-ray flux above 100 MeV. In radio, three compact components are resolved in the innermost part of the jet. One of these components shows a similar trend as the Fermi-LAT and KVA light curves. The gamma-ray spectra measured simultaneously with MAGIC and Fermi-LAT from 100 MeV to 650 GeV can be well fitted either by a log-parabola or by a power-law with a subexponential cutoff for the two observation campaigns. A single-zone synchrotron-self-Compton model, with an electron spectrum following a power-law with an exponential cutoff, can explain the broadband spectral energy distribution and the multifrequency behavior of the source. However, this model suggests an untypical low bulk-Lorentz factor or a velocity alignment closer to the line of sight than the parsec-scale radio jet.
dc.description.departmentDepto. de Estructura de la Materia, Física Térmica y Electrónica
dc.description.facultyFac. de Ciencias Físicas
dc.description.refereedTRUE
dc.description.sponsorshipGerman BMBF
dc.description.sponsorshipGerman MPG
dc.description.sponsorshipItalian INFN
dc.description.sponsorshipSwiss National Fund SNF
dc.description.sponsorshipSpanish MICINN
dc.description.sponsorshipSpanish Consolider-Ingenio programme
dc.description.sponsorshipBulgarian NSF
dc.description.sponsorshipAcademy of Finland
dc.description.sponsorshipDFG Cluster of Excellence "Origin and Structure of the Universe"
dc.description.sponsorshipDFG Collaborative Research Centers
dc.description.sponsorshipPolish MNiSzW
dc.description.statuspub
dc.eprint.idhttps://eprints.ucm.es/id/eprint/26607
dc.identifier.doi10.1051/0004-6361/201322951
dc.identifier.issn0004-6361
dc.identifier.officialurlhttp://dx.doi.org/10.1051/0004-6361/201322951
dc.identifier.relatedurlhttp://www.aanda.org
dc.identifier.urihttps://hdl.handle.net/20.500.14352/33631
dc.journal.titleAstronomy & Astrophysics
dc.language.isoeng
dc.publisherEDP Sciencies
dc.relation.projectID(CPAN CSD2007-00042)
dc.relation.projectID(Multi Dark CSD2009-00064)
dc.relation.projectID(D002-353)
dc.relation.projectID(127740)
dc.relation.projectID(SFB823/C4)
dc.relation.projectID(SFB876/C3)
dc.relation.projectID(745/N-HESS-MAGIC/2010/0)
dc.rights.accessRightsopen access
dc.subject.cdu537
dc.subject.cdu539.1
dc.subject.keywordLarge-Area Telescope
dc.subject.keywordActive Galactic Nuclei
dc.subject.keywordPerseus Cluster
dc.subject.keywordParticle-Acceleration
dc.subject.keywordMagic Telescopes
dc.subject.keywordTEV Emission
dc.subject.keyword3C 84
dc.subject.keywordChandra View
dc.subject.keywordCosmic-Rays
dc.subject.keywordLac Objects.
dc.subject.ucmElectricidad
dc.subject.ucmElectrónica (Física)
dc.subject.ucmFísica atmosférica
dc.subject.unesco2202.03 Electricidad
dc.subject.unesco2501 Ciencias de la Atmósfera
dc.titleContemporaneous observations of the radio galaxy NGC 1275 from radio to very high energy gamma-rays
dc.typejournal article
dc.volume.number564
dspace.entity.typePublication
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relation.isAuthorOfPublication.latestForDiscovery6bc87e5f-9b77-4982-b112-0d4f8aa128d0
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